Engine Control Module and Sensor Locations

Updated on January 26, 2019
arksys profile image

I like to write about automotive topics—particularly DIY stuff and auto concepts.

Mercedes Benz Engine
Mercedes Benz Engine

The engine control module (ECM) is also known as the powertrain control module (PCM) or the engine control unit (ECU).

The main responsibility of this controller is to get information from sensors and run certain actuators. In the case of any errors, the ECU shows a check engine light on your dashboard.

We will discuss where and why sensors are placed in certain positions and give some insight as to how or what the sensors sense. If you are a DIY person, then you could even open up the sensors yourself and clean them for optimum signals to reach your ECU.

ECM
ECM | Source

Powertrain Control

Engine Control Module

No matter how complicated, you'll find the sensors below in any EFI engine:

  1. Engine coolant temperature
  2. Air temperature
  3. Barometric pressure/manifold absolute pressure
  4. Mass air flow
  5. Idle air controller
  6. Crankshaft
  7. Camshaft
  8. Throttle position
  9. Oxygen
  10. Knock

Engine coolant temperature sensor
Engine coolant temperature sensor | Source
Location of ECT sensor
Location of ECT sensor | Source

Engine Coolant Temperature Sensor (ECT)

Like humans, a vehicle needs to maintain a specific temperature in order to function properly. Too cold, and the vehicle will drink too much petrol. Too hot and the head gasket could leak. Coolant is a liquid used in the vehicles radiator of the car to maintain the temperature at which the engine can perform at its optimum.

The engine coolant temperature sensor simply tells the car's computer (ECM) the current temperature of the vehicle. When the temperature of the coolant reaches between 75 and 95 degrees (depending on the manufacturer specifications), the ECM instructs the radiator fan to turn on and start cooling down the liquid.

  • Usually it is located either on the bottom of the radiator, or by follow the top radiator hose towards the engine block. You'll see it on mounted on the engine block.
  • It can be cleaned using a wire brush when you entirely change your engine coolant (approx. every 80,000 km or 50,000 miles).

Intake air temperature sensor
Intake air temperature sensor | Source
Location of intake air temperature sensor
Location of intake air temperature sensor | Source

Air Temperature Sensor (IAT)

The intake air temperature sensor (IAT) tells the ECM the temperature of the air that is going into the engine. The cooler the air, the better the performance of the engine, which is probably why you might have noticed a difference in the car's performance on a summer night as compared to the day.

  • It is usually located on the air filter box or the pipe going from the air filter box to the throttle body. Toyota has a MAF and an IAT sensor built in one unit which has five wires located on the air filter box.
  • It can be cleaned once every six months (depending on dust/pollution), using carb cleaner on an ear cleaner.

Manifold absolute pressure sensor
Manifold absolute pressure sensor | Source
Location of MAP sensor
Location of MAP sensor | Source

BARO/Manifold Absolute Pressure Sensor (MAP)

The baro sensor measures the ambient air pressure, which tells the ECM the current altitude of the vehicle. If you're driving in the mountains you'll need less fuel, because there is less oxygen in the atmosphere and therefore less oxygen in the engine cylinder. The ECM will adjust the fuel injectors "throwing time" or pulse width accordingly.

The map sensor detects the vacuum pressure created inside the intake manifold of the vehicle and sends the engine load information to the ECM. The ECM will adjust the fuel injectors pulse width accordingly.

Note: Baro and MAP sensors look and work in a similar fashion, therefore only one of the two sensors will be found in one engine.

  • Usually found either bolted on the intake manifold or linked with a vacuum pipe from the intake manifold.
  • If mounted on intake manifold then should be cleaned every 6 months to 1 year, using carb cleaner (depends on fuel quality where you live; the lower the quality of fuel, the more carbon deposits found). I've had to clean some every three months.

Mass air flow sensor
Mass air flow sensor | Source
Location of MAF sensor
Location of MAF sensor | Source

Mass Air Flow Sensor

The Mass Air Flow sensor is responsible for measuring the volume of air entering the engine.

The sensor contains a heated sensing element, as shown in the picture above. The temperature of this element has to be kept constant, but is cooled by the air passing through the intake. The MAF sensor produces more current to keep the temperature at the level required by the manufacturer. There is a small computer in the MAF which calculates the internal current flow to heat the element, and by using this figure it can calculate the volume of air going into the engine as well as the air density and temperature. The ECU uses this information to adjust the injector pulse width and spark (ignition) timing.

  • The MAF Sensor is located either on the air cleaner box or along the pipe going from the air cleaner to the throttle body.
  • Note: Since the MAF sensor calculates the air density, the engine does not need the MAP or baro sensor readings. Therefore you will not see a MAP or baro sensor in your engine if you have a MAF installed and vice versa.
  • Can be cleaned with carb cleaner or MAF cleaner spray and ear cleaning bud. Clean if you see dust or carbon deposits.

Idle air control valve (Japanese makes).
Idle air control valve (Japanese makes). | Source
Idle air control valve (seen in Hyundai models).
Idle air control valve (seen in Hyundai models). | Source
Location of IACV on typical Japanese vehicle.
Location of IACV on typical Japanese vehicle. | Source

Idle Air Controller (IACV)

The Idle Air Control Valve (IACV) is responsible for keeping the RPM of the engine steady. The IACV is actually an actuator and not a sensor because it does not supply readings to the ECM, but works on the command of the ECM. I just added this actuator for the DIY enthusiast.

There are two coolant pipes connected to the housing, which you can see on the far right of the picture shown. The black piece shown in the picture is a magnetic actuator which rotates the valve shaft allowing it to open and close as required by the ECM.

Whenever you start your car the IACV will increase the RPM until the coolant temperature sensor (ECT) tells the ECU that the temperature of the engine is up-to the manufacturers specifications. The RPM will then drop down to and remain steady at approx 800 rpm whenever there is an extra load on the engine the idle controller adjusts and compensates for the load applied—for example, switching from park to drive mode in an automatic transmission vehicle, or even when you switch on your air conditioning. You can also adjust the idle speed of the vehicle by loosening the screws on the actuator and rotate the actuator. The default setting of the actuator is normally in the middle.

  • Located on the throttle body of the vehicle.
  • Depending on fuel quality, carbon deposits build up and the valve shaft gets stuck resulting in fluctuating RPM signals on the dashboard.
  • To clean remove the black magnetic actuator which will reveal the shaft. Try rotating the shaft with your fingers. If it's a little hard, then use carburetor cleaner and a toothbrush or ear cleaning bud to clean the area of the valve (the two identical rectangular blocks), and check to see if the shaft is easy to rotate. When putting the magnetic sensor back, make sure the rubber O-ring goes on the metal housing and then align the tip of the shaft with the step inside the magnetic sensor. Set the sensor to the mid-position and tighten the screws.
  • Note: On some vehicles a scanner is required to reset the idle controller once opened.

Throttle position sensor.
Throttle position sensor. | Source
Location of throttle position sensor.
Location of throttle position sensor. | Source

Throttle Position Sensor (TPS)

The throttle position sensor (TPS) is linked from the accelerator pedal to the throttle body.

The TPS tells the ECM that the driver is pressing the accelerator pedal. The ECM can also verify this information with the MAP or MAF sensor readings, thus increasing the injector pulse width and spark (ignition) timing.

  • The TPS is located on the throttle body. Honda has an adjustable TPS sensor and if the initial if your RPM is high and cannot be controlled through the IACV, then the voltage readings of the TPS should be checked. The normal reading for a Honda is close to 0.6V at idle.

I remember playing with the TPS in my friend's car and adjusting his TPS to about 2.5 volts at idle. The result: The became a gas guzzler, consuming about 30 litres of petrol (about 7 gallons) in 30 km (about 18 miles). I guess we learned the hard way.

A newer system for the throttle control came in 2003-2005 and newer models of vehicles, in which a throttle cable is no longer used. A sensor has been placed in the accelerator pedal and the TPS sensor has been replaced with a throttle position motor.

  • This sensor never requires cleaning. If you do want to clean something on it then just clean the connector points with electrical contact cleaner and a toothbrush. That goes for all the sensors.

Camshaft position sensor.
Camshaft position sensor. | Source

Camshaft Position Sensor

The camshaft position sensor (CMP) is electro-magnetic and produces a voltage when a metal object moves past. This sensor is responsible for telling the ECM the current position of the camshaft. With this information the ECM can calculate which valve is open and throw fuel through the injector into that cylinder.

  • This sensor is found on one end of the camshaft, usually on the right side in a front wheel drive car. It's normally not very difficult to access.
  • Cleaning can be done with a simple dry cloth, but if the oil has been used for too long, a golden-brown stain is left on metal portion of the sensor. In some cases it even comes out black and gooey, which is basically old engine oil turned into sludge. if it's stained then you can use a wire-brush or very fine sandpaper to remove the stain. Make sure no metal bits remain on the sensor. If you need some liquid type material to get some stains off, try WD-40.

Crankshaft position sensor.
Crankshaft position sensor. | Source
Comparison of CMP and CKP sensors.
Comparison of CMP and CKP sensors. | Source

Crankshaft Sensor (CKP)

This sensor is very similar to the cam position sensor in functionality. It is responsible for telling the ECM the exact location of the crankshaft as well as the RPM (rotations per minute) of the engine. With this information the ECM knows the position of each piston in each cylinder. Using the cam sensor readings, as well as the crank sensor readings, the ECM knows exactly which injector needs to be activated. The synchronization of the cam and crank shafts in an engine is the key to engine performance. This synchronization is also referred to as the engine timing. With the correct timing you will get the fuel and spark delivered at the right time.

  • It is located at the bottom of the engine somewhere close to the crankshaft.
  • Cleaning technique for this sensor is exactly the same as the cam sensor. Cleaning once a year is good enough for this sensor.
  • Note: If your car does not start, a possible reason could be a faulty crank sensor or a broken wire in the crank sensor circuit.

Oxygen sensor.
Oxygen sensor. | Source

Oxygen Sensor (O2)

The oxygen sensor (O2) is responsible for "smelling" the exhaust fumes and detecting the oxygen content in order to make sure the engine is consuming the right amount of fuel. The ratio maintained by the ECM is 14.7 parts air to 1 part fuel. This is known as the air/fuel ratio.

There are two types of oxygen sensor: zirconia or titania. These are materials which can detect oxygen and produce a voltage. The voltage range falls between 0.1V to 0.9V.

I normally use a vehicle scanner to check the maximum and minimum readings of the oxygen sensor. If I see both peaks, then I know the sensor is working fine. If the voltage max is 0.8 then I open up the sensor for cleaning. Sometimes the sensor produces a constant voltage but does not fluctuate. This generally means the sensor needs to be replaced.

Knock sensor.
Knock sensor. | Source

Knock Sensor

The knock sensor contains a piezoelectric crystal. This crystal is able to detect mechanical stress and produces a voltage when the car knocks or pings. Under heavy acceleration, it sends signals to the ECM and the ECM retards the ignition timing to compensate for the knocking, which in effect protects the pistons and rings from damage.

Knocking also occurs when using low-grade fuel and having the knock sensor allows you to use different grade fuels without causing engine damage.

  • This sensor is normally bolted onto the main-body of the engine in the most difficult and awkward positions. Lucky this sensor never requires cleaning.

What Happens If One of These Sensors Fail?

If a sensor fails and gives abnormal readings, for example a coolant temperature sensor giving a constant reading of -40o, then the ECM goes into fail-safe mode. This means it basically ignores the values of the sensor at fault and tries to either calculate the value of the failed sensor or assumes a constant reading so the vehicle can keep running. Some faliures like a crank sensor or a MAF sensor will result in the vehicle not starting at all.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Questions & Answers

  • Is a sensor & module for the transmission considered the same part?

    No. A module is a separate ECU that controls the transmission. Sensors give the module information. Have a look at the transmission control module article I have written to get more info on the types of sensors used with the transmission control module.

  • After cleaning my 1999 Honda Accord 4 cylinder 2.3 l VTEC all the carbon out of the intake system. My car starts to run, then stalls out and will not start back up. What's the problem and what should I check?

    Check MAF / MAP sensor electrical grip (whichever your car has) and look for air leaks.

  • Is the controller for the heater on an O2 sensor in the ECM?

    Heater location is inside the O2 sensor. Heater is controlled by the ECM so there would be a chip on the ECM board that would control the O2.

  • I am in the UK and have a Seat Leon with 1.4tsi 150bhp. If I drive off in the morning, the engine warning light comes on after about 5 mins. The code reader shows fault code PO11F re ECT sensor. Can this be erased & not come back until next day? The car otherwise runs fine. If I start and then stop before driving off in the morning, the warning light does not come on at all. I'm wondering if the fault could be related to an ECU remap I did. Firm that did the remap is adamant that the fault isn't related. Is that true?

    PO11F In most cases seems to point toward emissions rather than the ECT. Even though the vehicle shows and ECT error there is an underlying problem which will not fix the problem even if you change sensors. I would say first, check the fuel pump pressure when you turn they key in the ON position (priming; without starting the engine). Second; check if your Catalytic converter is choked (if you have problems with fuel consumption). In another source, the code given is associated with overheating and a blown head gasket or even a minor timing belt issue. It could be one of these but cannot be confirmed as I’m not entirely sure what the remap includes. Try to eliminate the easier ones to see if it works. If the easy ones don’t do it then wait until the light stays on longer and comes on more often to check the rest.

  • What allows for an engine to be diagnosed?

    Any malfunction in the sensors or mechanical issues.

Comments

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    • arksys profile imageAUTHOR

      Irfan 

      6 weeks ago from Adelaide, Australia

      @Kolopen brown;

      Check for the following

      battery is fully charged and engine cranking normally. If not; check starter motor.

      Immobiliser issues

      air blockage in the intake system.

      Air inside the fuel system (requires bleeding)

      Low fuel in tank

      Pre-heating system (glow plugs)

      Exhaust blockage (CAT)

      Clean crankshaft sensor

    • profile image

      Kolopen Brown,email-bkolopen@yahoo.com Lombrum Manus Island PNG 

      7 weeks ago

      2016 Ford Ranger 2.2l crank,can not start.Can I remove and clean the

      crankshaft sensor/cam sensor.

    • arksys profile imageAUTHOR

      Irfan 

      2 months ago from Adelaide, Australia

      @jimmy; check the wiring for signs of corrosion or rust. Make sure you clean the grips and points with an electrical contact cleaner spray. Try adding an earth wire to the ECU box. If none of these work then look at replacing the ECU. you could also test with a similar vehicles ECU before purchasing a brand new one or just get it from the wreckers.

    • profile image

      Jimmy 

      2 months ago

      I was scanning my smart forfour .and i got trouble code P0606 ECM .should i change complel ECU and prograim it .or chech the wires ?

    • arksys profile imageAUTHOR

      Irfan 

      4 months ago from Adelaide, Australia

      @joseph : need to replace the MAF sensor.

    • profile image

      Joseph 

      4 months ago

      I have nissane almera 1.6 2004 problem is idle and smoke black

    • profile image

      Nithish 

      4 months ago

      Super boss

    • profile image

      dejene 

      6 months ago

      Best

    • arksys profile imageAUTHOR

      Irfan 

      7 months ago from Adelaide, Australia

      @jamal: cleaning works. I also used throttle body spray to clear the carbon inside the metal shell. Try cleaning before replacing.

    • profile image

      jamal 

      7 months ago

      do i need to change oxy sensor or its enough to clean it by steel brush. its santafe

    • profile image

      Hassan 

      8 months ago

      Nice good

    • profile image

      Zaffar Abbas 

      9 months ago

      My sweet friend thankyou

    • arksys profile imageAUTHOR

      Irfan 

      9 months ago from Adelaide, Australia

      @zahid: In your registration papers or the metal vehicle identification plate under the hood.

    • profile image

      zahid 

      9 months ago

      how can I get engine code or model of my ecm, where it is written on?

    • arksys profile imageAUTHOR

      Irfan 

      9 months ago from Adelaide, Australia

      @zahid : check the sensors with a scanner. If no error codes then all the sensors are working fine. You can find the wiring diagrams online but need to know your engine code.

    • profile image

      Zahid 

      9 months ago

      my Honda 2000 city has an altered arrangements having ECM with too many wires are not being used. I want to check its wiring case I am feeling some problems in its drive. Please help me for the following,

      1. wiring diagram

      2. how can I test/check my car's sensors

      My ECM has ear a no as LOX 7748

    • arksys profile imageAUTHOR

      Irfan 

      9 months ago from Adelaide, Australia

      @jimmy : those are coils or coil packs. They are not sensors; which sense things but actuators which can do a single task (create spark) and are told by the ECM when to do it depending on a few other readings such as the timing etc.

    • profile image

      Jimmy 

      9 months ago

      What is the Sensor called what gos on the spark plugs

    • arksys profile imageAUTHOR

      Irfan 

      9 months ago from Adelaide, Australia

      @kanisha : one possibility is that the timing belt/chain has skipped a tooth causing these issues. You will have to get that checked first before thinking about other things.

    • profile image

      Kanisha 

      9 months ago

      Everytime the check engine light comes on it says PCM or all cylinders are misfiring can you please tell me why?

    • arksys profile imageAUTHOR

      Irfan 

      9 months ago from Adelaide, Australia

      @Itumeleng: check air/spark/fuel supply.

    • profile image

      Itumeleng 

      9 months ago

      Hi my Toyota quantum 2kd engine cranks but no start

    • arksys profile imageAUTHOR

      Irfan 

      10 months ago from Adelaide, Australia

      @saad : no related videos

      @Iter : thank you.

    • profile image

      Iter 

      10 months ago

      This is a very good idea to learning car system.

    • arksys profile imageAUTHOR

      Irfan 

      10 months ago from Adelaide, Australia

      @ajay : it depends on the vehicle and their features. You will find these sensors in every efi vehicle as these are the core sensors to keep a vehicle running.

    • profile image

      ajay 

      10 months ago

      good job

      but its not a complete list.

      more then 55 sensors use in vehicle.

    • profile image

      georgezuze 

      10 months ago

      thanks

    • profile image

      Arvind 

      11 months ago

      How many types of sensor in vtvt engine

    • profile image

      Arshad khan 

      11 months ago

      Thanks

    • arksys profile imageAUTHOR

      Irfan 

      11 months ago from Adelaide, Australia

      @Nagvadiya: maybe fuel pump overheating. Need replacement.

    • profile image

      Nagvadiya hitesh 

      11 months ago

      Why not start my car in hot conditions??

    • profile image

      chibwebrian9@gmail.com 

      12 months ago

      Thanks

    • profile image

      Musadaq Javaid Chaudhary 

      12 months ago

      good information about function & location of sensor.

    • arksys profile imageAUTHOR

      Irfan 

      12 months ago from Adelaide, Australia

      @mubeen : as Goose mentioned. Check for air leaks. Next try high octane fuel.

    • arksys profile imageAUTHOR

      Irfan 

      12 months ago from Adelaide, Australia

      Hey George,

      Great to hear from a fellow Zambian... I miss that place.

      I’m guessing your closest option would be South Africa but it would be helpful if you can take the computer to an electronics guy and try to get it repaired. The chips on them are similar to other Toyota computers so you might be able to get one from a wrecked car. The most common problem in toyotas were the injector chips got burnt. You can replace them with other Corolla models. Hope that helps. Ping me again if you need more details.

    • profile image

      George 

      12 months ago

      My 2002 toyota duet EJ-VE engine computer box got damaged. Where can i get a new or used one.in zambia there are not found.its an M30

    • profile image

      Goose 

      14 months ago

      Maf-intake hard rubber flex duct vacuum leak...there can be NO leak between MAF and engine block or this happens, wrap that rotten ribbed section with some duct Tape. God Bless!!!

    • profile image

      Mubeen 

      15 months ago

      My engine starts to knock at 3500 rpm. It used to knock at 7200 rpm

      D17 A civic 2005

      Solution please

    • arksys profile imageAUTHOR

      Irfan 

      15 months ago from Adelaide, Australia

      @damilare :

      Step 1: Set the engine switch to the "LOCK" position with trip meter A reading shown.

      Step 2: While pressing the trip meter reset button, set the engine switch to the "ON" position.

      Step 3: Continue to press and hold the button until the trip meter displays "000000" till all 6 "0" clears.

    • profile image

      damilare 

      15 months ago

      my Toyota big daddy shows oil light on the dashboard when it's hot meanwhile I changed oil pump, oil filter with new oil. please help I don't no what to do

    • arksys profile imageAUTHOR

      Irfan 

      16 months ago from Adelaide, Australia

      @Clive : you can’t blow the ECU like that. Sounds more like your immobiliser with the keyfob May need reprogramming. Get that checked first. Engine light stays on at ignition. It will switch off once the vehicle starts and it checks if all systems are ok.

    • arksys profile imageAUTHOR

      Irfan 

      16 months ago from Adelaide, Australia

      @letsela; check MAF sensor area and intake pipes for air leaks.

    • arksys profile imageAUTHOR

      Irfan 

      18 months ago from Adelaide, Australia

      @rajesh ; try changing the temperature sensor also know as fan switch.

      @stompi ; follow the top radiator hose, it will lead to the thermostat valve area with a few pipe connections; you might find the sensor there.

      @johnny g ; could be one of many things. First check security system and make sure immobiliser is working ok. Second check the battery voltage. In the newer cars if there is not enough juice in the battery it won’t start, I think 11.5volts is the minimum. Next check for air leaks in the intake area. Next check If the injectors are working or not; next check if you have a spark or not. Next check engine compression. If all is fine then try changing the crank sensor and if it has a MAF sensor then you may have to replace that too. Better if you can test the parts with a friend’s car or something before actually purchasing. Let me know if there is anything else.

    • profile image

      johnny g 

      18 months ago

      2008 mazda 6 2.3ltr engine wont startperiod could it be the crank sensor

    • profile image

      stompi 

      18 months ago

      I'm driving 2001 jetta 4 1.6 SR engine I just put a radiator but this one don't have a temperature switch on top of it so I like to know whether dose this model have a temperature switch from engine like conquest 1.3

    • profile image

      Rajesh Sharma 

      18 months ago

      Toyota haice. ..2005 ...EFI. ..2.5 turbocharged diesel .radiator fan runs ok ..on direct but doesn't start when temperature raises to operating temp ....cannot figure out sgars wrong ...also give rough engine .. srarts ok ..

    • arksys profile imageAUTHOR

      Irfan 

      18 months ago from Adelaide, Australia

      @Jeffrey : sounds like your throttle position sensor is not on properly. Located on the other side of the accelerator Cable ... you need to check the voltage it’s giving out and keep it somewhere around 0.5volts on idle. 4.5volts on wide open throttle.

    • profile image

      Farhan 

      18 months ago

      Nice

    • profile image

      Jeffrey 

      18 months ago

      I have a Toyota camry 3s fe engine done engine overall a couple of days ago but ever since that day the fuel consumption became high now takes 1 litre for 3 km which is very and extra bad for a 2.0 engine the power is good no doubt but it sometimes hunts while idling and sometimes the check light is on. Most of the times I notice black smoke what might be the problem

    • arksys profile imageAUTHOR

      Irfan 

      19 months ago from Adelaide, Australia

      @Rajesh : you might have to replace the engine coolant temperature sensor. Follow the radiator pipes to the thermostat valve; there will be a 2 wire sensor in that place. also known as the fan switch.

    • profile image

      Rajesh Sharma 

      19 months ago

      My toyota hiace With a 2 kd ftv diesel engine fan does not start when engine gets hot ..but both fans are ok ..the relay and fuses seems all ok ...will appreciate. .thanks .

    • arksys profile imageAUTHOR

      Irfan 

      19 months ago from Adelaide, Australia

      @addis : you cannot use one ECM to test. You will need to use the ecm for that specific engine. It will have to change every time.

    • profile image

      addis 

      19 months ago

      how to use one ECM on engine test stand for different types and models cars??

    • arksys profile imageAUTHOR

      Irfan 

      20 months ago from Adelaide, Australia

      @sazi : check for air leaks. That’s what causes heaviness... also check idle controller on throttle body. If problem persist then get the air sensor checked again.

    • profile image

      Sazi 

      20 months ago

      Hi i had a problem with my nissan almera 2002 model 16 valve,the airflow sensor was giving me problems i had it replaced,now my car is heavy on fuel and idling is going up and down...and my exhaust is smelling fuel when idling by when I took that airflow sensor plug is running 100% bt gives me warning light...can u please help me.

    • arksys profile imageAUTHOR

      Irfan 

      21 months ago from Adelaide, Australia

      @maizan : you can try to connect a fuel pressure sensor with a meter for viewing. If the pressure drops there is a leak. You can connect it to the fuel injection rail. If you still have problems I’ll add you on whatsapp... let me know.

      @his detinedzs: efi did not come out in 1991... please check your distributor or current going to coil pack.

      @peace: check crank sensor if it’s an efi vehicle for starting issue.

    • profile image

      Azhar 

      22 months ago

      very informative things this side told me

      THANK

    • profile image

      His Destinedz 

      22 months ago

      My 1991 Volvo Do Not Spark At The Coil And 4 Plug

    • profile image

      Peace 

      22 months ago

      My Toyota 1996 model, I was going to working one morning and all of a sudden it start jucking and the check sign came up, as well as it won't quick start, I have changed my fuel filter and bump but still, pls what can be the problem. Thanks

    • profile image

      DIDIER 

      22 months ago

      thank you for the sensors

    • arksys profile imageAUTHOR

      Irfan 

      22 months ago from Adelaide, Australia

      @anietie

      Sounds like your idle air control valve needs cleaning. Ask a mechanic to clean the throttle body and idle control valve. It should be ok after that.

    • profile image

      Anietie Joseph 

      22 months ago

      Am having some problem with my 2005 Toyota corolla, 1NZ engine. While driving I notice the rpm malfunctioñing, I pull over to çheck, suddenly the compressor discharge some gas, there after I drove it home safe, just at home the engine off. Since then, its has been starting and off, ,call an electricians to check, nothing has found faulty so far, but the last thing to check is the crankshaft sensor or so, pls any one with useful solution can help.

    • profile image

      Tharngel 

      22 months ago

      Why does occur tapping noise in VVTI 1300 cc ?

      I made modified air flow !

      How fit it ?

    • profile image

      eufrocinio dantes 

      23 months ago

      Can't locate exact location of the fuel pressure regulator, thanks.

    • arksys profile imageAUTHOR

      Irfan 

      2 years ago from Adelaide, Australia

      @Rahul : please give more details. I'll try to help as much as I can.

      @Billy : sometimes simply unhooking doesn't work. You might have to put a wire to connect both points on the grip you removed to get it to work. Depends on the circuit used in your car. Try putting in a jumper wire and see if the fans work.

    • profile image

      BILLY 

      2 years ago

      MY COOLENT FANS WONT COME ON. I unhooked my temperature sensor and they didn't come on then I hooked them back up and turned AC on and they still won't come on changed relays and checked fuses they are all good just wondering what the problem could be?

    • profile image

      Rahul jha 

      2 years ago

      Hello sir,

      I have a problem my Skoda fabia is late staring problem. Would u like to help how to fix this problem.

    • arksys profile imageAUTHOR

      Irfan 

      2 years ago from Adelaide, Australia

      Hi Geven,

      You will need to get your key programmed to work with the immobiliser of the vehicle. Look for someone who does key programming in your area.

    • arksys profile imageAUTHOR

      Irfan 

      2 years ago from Adelaide, Australia

      Hi mark,

      Try checking the map/baro sensor grip first to see that it's connected properly. Secondly check to make sure there are no air leaks in the intake system. There is also an o-ring on the map/baro sensor ... make sure the sensor sits tight in it's place. If all good and problem persists then you may have to replace the sensor.

      It would be better if you can find a similar vehicle and change the map sensor to see that it takes the problem away before purchasing a new one.

      Let me know if the problem persists after all this.

    • arksys profile imageAUTHOR

      Irfan 

      2 years ago from Adelaide, Australia

      hi simon,

      i'm guessing your problem will be in the MAF sensor or the MAP sensor. I would advise to get the car scanned with a diagnostic tool to confirm; then replace the sensor.

      @donald : did you mean knock sensor?

    • profile image

      Simonngwezhi@gmail.com 

      2 years ago

      My car it's producing blacksmoke and engine light is on. It's a 3s engine light diagnosis

    • profile image

      donald 

      2 years ago

      does the block senser have an impact in the runing of the engine if its not connected?

    • profile image

      Mr Fixer 

      2 years ago

      Yes there is a fan control module sensor in vw golf make 3, 4 & 5 too that senses when the coolant is hoter and needed cooling, and will automatically toggle from low radiator fan spin to medium or high depending on the current temperature of the coolant present in the radiator.. This sensor is mounted right at top conner driver side of the radiator. And if it goes bad will stop the the radiator.

      It has the tendency of kick starting the radiator fan and shutting it down based on instructions from the ECU.

      It also has the tendency of kick starting your radiator fan even when your engine has shut down for a while due to incomplete cooling cycle required for the health of your engine.

    • profile image

      ABBA BONYO 

      2 years ago

      Keep it up,and all this said here are true.

    • arksys profile imageAUTHOR

      Irfan 

      2 years ago from Adelaide, Australia

      @zibusiso : I have not heard of a module sensor before. There is a temperature sensor attached to the body near the hose coming from the radiator and some cars (like honda civic) have a second temperature sensor on the radiator. There is a thermostat valve which allows the colder water to flow into the engine but no module sensor.

    • profile image

      zibusiso 

      2 years ago

      is there something called a module sensor for VW Golf 4 meant to cool down the car in cases where it is overheating.

    • profile image

      Md.Akram Hossain 

      2 years ago

      No doubt that, it's a very intellectual explanation. I am highly pleased to the better analysis of automotive sensing components. hoping that I will get latest information in future also. Have a good days. Allah hafej.

      Best regards.

      Akram

    • arksys profile imageAUTHOR

      Irfan 

      2 years ago from Adelaide, Australia

      @abu hasssan : thanks for stopping by... :)

      @jethro : thank you... :)

    • arksys profile imageAUTHOR

      Irfan 

      2 years ago from Adelaide, Australia

      hi Abinash

      Newer cars a motor fixed with the throttle body. An additional sensor is placed under the accelerator pedal known as the accelerator pedal position sensor which controls the throttle body motor.

      Nothing happens if you only have a MAF ... if you don't have a MAF you will have a separate MAP and Air Temperature sensor to get those readings. The TPS value will come from either the TPS sensor or the Accelerator sensor.

      At the end of the day these values are required by the ECU therefore it will have to be given one way or the other so that further calculations can be made on how much fuel to deliver in the injectors etc.

    • profile image

      abu hasssan 

      2 years ago

      thank you

    • profile image

      Abinash 

      3 years ago

      Do all cars have a TPS as well as a MAF sensor. So what happens if my car only has a MAF sensor?

    • profile image

      jethro 

      3 years ago

      nice forun

    • arksys profile imageAUTHOR

      Irfan 

      3 years ago from Adelaide, Australia

      @Raj: search for "OBD II" or OBD 2 scanners. (OBD= onboard diagnostics.)

    • profile image

      Raj 

      3 years ago

      Sorry I didn't ask the question clearly. Is it possible to get readings from ECM? For ex, coolant temperature, intake air temperature, ambient temperature, engine temperature, engine rpm etc... If yes, what kind of devices can be attached to get the readings from ECM?

    • profile image

      Raj 

      3 years ago

      I wanted to know that is it possibld to get reading from ECM?

    • arksys profile imageAUTHOR

      Irfan 

      3 years ago from Adelaide, Australia

      @Bresmen : Check for air leaks.

    • profile image

      bresmen 

      3 years ago

      I have 2005 chevrolet classic when this power begins to raise and lower the rpm needle

    • arksys profile imageAUTHOR

      Irfan 

      4 years ago from Adelaide, Australia

      For automatic transmission vehicles 1000 rpm is normal. 800 is for manual transmissions.

    • profile image

      Boubker 

      4 years ago

      hi I have a Audi A4 b8 diesel the rpm stay on 1000 when the car is on park what could be thank you

    • arksys profile imageAUTHOR

      Irfan 

      4 years ago from Adelaide, Australia

      @winwin : it's sluggish because of an air leak. Make sure the piping and airbox is sealed properly. Any kind of air leak will make it less responsive.

      If it's in safe mode then disconnect the battery terminals for 10seconds then fasten them on again. It will erase all the previous codes.

    • profile image

      soe lwin win 

      4 years ago

      Hi,I start engine without air filter.now my car is too sluggish. I think it safe mode.how I fix? My car is 2001 toyota mark ii. Obd2.please help me.

    • Bashar Alkhateeb profile image

      Bashar Alkhateeb 

      4 years ago from Amman, Jordan

      The idle rpm is 0.8

      I'll try to do that

      By the way my whatsapp num is 00962796353144

      And thanks brother

    • arksys profile imageAUTHOR

      Irfan 

      4 years ago from Adelaide, Australia

      70 is normal temperature ... goes up to 95 or 97 in some cases.

      what is the idle RPM?

      did you wash the throttle and IACV using carb cleaner? maybe something is stuck (carbon). maybe that's why nothing changes.

      if throttle is clean then adjust the IACV valve a little. it should lower the rpm.

      Also check with scanner to see if there is any engine code. sometimes the check engine light does not work (the electricians here who don't know how to fix the light cut the wire of the light to get paid).

      If you have whatsapp then send me your number through my profile and can help you there.

    • Bashar Alkhateeb profile image

      Bashar Alkhateeb 

      4 years ago from Amman, Jordan

      The engine turn off when the temperature reaches 70 and the rpm start playing with himself

      I reset the adjustment on the throttle but nothing changes!!!

    • arksys profile imageAUTHOR

      Irfan 

      4 years ago from Adelaide, Australia

      Bashar,

      The ECU should do it by its own if nothing was touched before replacing it. First check to see the ECT is working properly using the scanner (fan will switch on and off at the correct times) ... If the RPM is high after the new installation then YES, bring it down using the adjustment on the throttle.

    • Bashar Alkhateeb profile image

      Bashar Alkhateeb 

      4 years ago from Amman, Jordan

      Do i need to reset the rpm after i change the ECT??

    • arksys profile imageAUTHOR

      Irfan 

      4 years ago from Adelaide, Australia

      Not sure about the Chevy but there is an inertia switch which cuts fuel supply incase of an accident. That could be the cause.

    • profile image

      p keshav 

      4 years ago

      Could be your vvti sensor a had a similar problem once replaced, the problem was solved

    • profile image

      Qasim 

      4 years ago

      I have a 2005 Chevy Malibu classic with a 2.2 ecotehch enine.II have replaced my fuel pump and filter and now I have no psi to the fuel injectors so the car wont start.Is there a reset for this car or do I have to have it reset via computer?

    • profile image

      Dorota 

      4 years ago

      Ignition module works for me if it gets too hot, it makes it tough to start. There suhlod be a heat conducting gel under the module, I have no idea how long it is supposed to last, but it would be a quick and cheap fix if all you had to do was clean off the old gel and add some new stuff.

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