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I think my ECM need to know how to determine that it is bad. Tear1 6068 engine.

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Sadly, there is no way to determine that without the wiring diagram or replacing it with a known good one. There are two fuses that will send power to it though. One of them will be in the regular dash fuse panel, the other will be in a fuse holder out at the ECM and will have a wire that runs directly from the battery.

Posted on Oct 12, 2009

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I have a 2010 Chevy impala LS instrument cluster and it has a 20 pin plug I'm trying to figure out which wire's on the back of the cluster are for the speed sensor, rpm, gas, and temp wires.


Boy your way off base . All the gauges are inputs from the ECM - engine computer . The VSS - vehicle speed sensor , ETC - engine coolant temp sensor , sending unit in the fuel tank , All this sensors input the engine computer . The PCM then sends this info on the GMLAN serial data bus ,communications network . The Instrument cluster has a microprocessor inside that translates this info an controls the gauges. You probably have an instrument cluster problem or a communication network problem . Your best bet is to take your vehicle to the dealer or some other qualified repair shop. Need to have it checked for DTC'S - diagnostic trouble codes.
Indicators and Warning Messages
Refer to Indicator/Warning Message Description and Operation.
Engine Coolant Temperature Gage
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine coolant temperature. The IPC receives the coolant temperature information via serial data message from the body control module (BCM). The engine coolant temperature gage defaults to 60?°C (140?°F) or below if:
?€¢
The ECM detects a malfunction in the engine coolant temperature sensor circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the BCM.
Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the fuel level percent. The body control module (BCM) sends the fuel level information from the ECM to the IPC via a serial data message indicating the fuel level percent. The fuel gage defaults to empty if:
?€¢
The ECM detects a malfunction in the fuel level sensor circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the BCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates in the IPC.
Odometer
The vehicle odometer is calculated and stored electronically in the instrument panel cluster (IPC). The IPC contains a season odometer and trip odometer A or B. Momentarily press the trip/fuel button in order to toggle between the season odometer and the trip odometer. Press the set/reset button for greater than 0.25 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the engine control module (ECM). The IPC calculates the mileage based on the serial data vehicle speed information from the ECM. The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers and can be set through the customization menu in the driver information center (DIC).
PRNDL Display
The instrument panel cluster (IPC) displays the selected gear position as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the gear position. The PRNDL display blanks if:
?€¢
The ECM detects a malfunction in the transmission range switch circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the body control module (BCM).
Speedometer
The instrument panel cluster (IPC) displays the vehicle speed as determined by the engine control module (ECM). The IPC calculates the mileage based on serial data vehicle speed information from the ECM. The IPC receives vehicle speed information from the body control module (BCM) via a serial data message. The speedometer defaults to 0 km/h (0 mph) if the IPC detects a loss of serial data communications with the ECM or BCM.
Tachometer
The instrument panel cluster (IPC) displays the engine speed as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine speed. The IPC receives the engine speed information from the body control module (BCM) via a serial data message. The tachometer will default to 0 RPM if:
?€¢
The ECM detects a malfunction in the engine speed sensor circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the BCM.

How to Diagnose Controller Area Network CAN Suggest you read up on C.A.N.

May 14, 2016 | Cars & Trucks

1 Answer

If the cam shaft sender goes out will it shut the car down even if no sputtering or no warning and it's running,just cut off like you turned the key off


it will just shut off the engine because the ECM will have no idea of the position of the cam in relation to the piston
The ECM needs to know the exact position of the crank and cam shafts to determine the ignition timing so if one or both go out then the engine stops
If course if the timing belt breaks the same result happens as the cam shaft sensor stops sending a signal to the ECM so the ECM shuts the engine down

Feb 24, 2016 | Cars & Trucks

2 Answers

How to tell if your ecm is bad 96 kia sportage


running fault codes will determine if there is a faulty ECM
try using a scan tool to reset the ECM program as it is easily corrupted by voltage surges and battery disconnections.

Aug 12, 2015 | Kia Sportage Cars & Trucks

1 Answer

Car cranks but wont start? No spark. Changed ecm relay no help. Ignition harness is good. No fault codes. Battery is good. changed ignition relay, no help. I think its the ECM but need more info to spend...


Yes, the ECM is the last thing to replace after all other possibilities. No spark could be bad ignition coil, bad Ignition Control Module (controls the coil circuits for spark), bad plug wires, the crank and cam sensors (for ECM to determine spark timing).

Check the ICM -it can be tested at a parts store. If good, check the crank sensor.

Mar 16, 2015 | Cars & Trucks

1 Answer

On my 2001 Nissan Quest 3.3L #5 cilynder miss fire replace sparkplugs, wire, distributor, and injector still miss fire so I hook a noid light to it, it won't light up at all can it be the ECM and if you...


I don't know where it is, probably under the passenger side dash. But before condemning the ECM, check the wiring to that injector. First try to determine if it is the power wire or the ground wire for the injector which is lost. With key on, the yellow power wire should have voltage on it at the injector connector. This is independent of the ECM-only the ground wire goes into the ECM, to be internally grounded to pulse the injector. The #5 ground wire is a yellow-green wire.

If you have voltage on the power wire to #5, key on, then we know either the ground wire is bad (broken or open) to the ecm -or the internal ground for that injector is out, inside the ECM.

To determine whether it is the ground wire or the ECM, you will have to locate the ECM, pull the electrical connector off to it (Be sure and take the negative battery post off, first.), then locate the yellow green wire at pin #106 of the ECM electrical connector. Now test the continuity of that wire from the injector connector to the ECM connector-use a voltmeter set to ohms. If the wire has continuity, then the ECM must have a problem- the internal injector driver for #5 may have failed. Also look for a bent pin at #106, or anything amiss in the electrical connector. In most cases, it is not the ECM but a wiring problem.
Good luck. To locate the ECM, register for free at autozone.com, listing make, model, and year. Look under "repair guides", then component locations-it should tell you the location of the ECM.

Oct 04, 2014 | 2001 Nissan Quest

1 Answer

How to test the engine control module in a 1993 chrysler lebaron


we replaced the part that is like an emergency fuel shut off in case of an accident. 1st time the new part was bad, bought another one for $18. works fine

Apr 27, 2012 | 1993 Chrysler Lebaron

1 Answer

Car flashes engine codes


Hi Michael, The engine check light will display fault codes when connected to a scanner or a specified bridge is made onto the diagnostic socket. It is very unusual for the ECU to be defective (but not impossible). Have a scan carried out on the vehicle and the technician (You if you are) can determine what the problem is. Regards John

Mar 31, 2012 | Plymouth Acclaim Cars & Trucks

1 Answer

What does a bad air intake temperature control valve do on a 2003 Oldsmobile alero


The IAT ( intake air temperature ) sensor tells the engine controller (ecm) what temperature the incoming air going into the engine is. The ecm uses that information to help determine fuel mixture based on air density.
It is also used for certain emission testing the ecm does at engine start up.

Dec 03, 2011 | 2003 Oldsmobile Alero

3 Answers

New o2 sensor went bad in 1 day after being


The connections to the sensor is heater voltage which is +12 volts supplied by external (from the ECM) wiring from the battery, and the 0 to + 5 volt self-generated signal from the O2 sensor is an input to the ECM. Suggest that you find another mechanic that isn't intent on selling parts. Also suspect is the quality of the replacement O2 sensor. It would take a major disaster within the ECM to make an input connection turn into an output and would likely damage the O2 sensor almost immediately--not a day later. Hope this helps!

Jul 19, 2010 | 2005 Dodge Grand Caravan

1 Answer

If my crankshaft cencer a & b are bad what would be the car be acting like. It has a 3.5 liter v6 in it.


Bad Idle, stalling, and engine in worst case will not start. The ECM take readings from the crankshaft and camshaft sensor to determine the engine's ignition timing and fuel injector timing.
A total sensor failure will cause the engine not to restart if there is no output reading form the sensor to the ECM. If there is an Auto Zone in your area, they can scan your car to address the issue if your crank/cam shaft sensor has gone bad and will need to be replaced.
Thank you for using fixya and Auto Zone scan free of charge and has the step by step instructions to get the job done.

May 11, 2010 | 2001 Oldsmobile Aurora

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