Does the ECM control the ignition?
Lastly, the ECM controls the ignition timing, this is the position at which the spark plug is fired within the combustion cycle. Precise control of this timing allows for more power and/or better fuel economy. The ECM also controls multiple other systems on top of these main tasks.
Can a bad ECU cause misfire?
Another symptom of a bad or failing ECU is erratic engine behavior. A faulty computer may cause the vehicle to intermittently have issues such as stalling or misfires.
Can you fix an ECU?
ECU repairs can be very expensive. The part alone can cost between $1,000 and $3,000, depending on the make and model of your vehicle. Fortunately, an ECU can be repaired or reprogrammed in many cases—thus preventing the need to actually replace an ECU.
Does removing battery reset ECU?
That’s because, if you disconnect your battery for long enough to reset the computer, it may cause the processor to forget everything it has learned. Leaving the ECU without power for a significant amount of time (over 5 – 10 minutes) will likely cause it to reset back to square one.
How do you diagnose a bad ECU?
If you experience jerking or stopping, you regularly maintain your transmission properly, and the vehicle has adequate levels of transmission fluid, then a faulty ECU should be suspect.
How to test the ignition module and crank sensor?
So, if you’re driving a Chevy, a Buick, a Pontiac, or an Oldsmobile with either one of these engines, not forgetting the Isuzu Rodeo or Trooper, this ‘How To Test The Ignition Module’ and 7X (3X) article applies. There are two other articles that may help:
Is there a spark in the ignition module?
There is no spark coming out of any of the ignition coils sitting on top of the ignition module. You may have taken your ignition control module (ICM) to Auto Zone to test it and the friendly boys in orange say it’s good, yet the vehicle will not start (all major auto parts stores such as O’Reilly, Pepboys, etc., test ignition modules for free).
What is the crank sensor on a GM 3.1L engine?
This article will help you test the ignition control module (ICM) and 3X crankshaft position sensor on all of the GM 3.1L and 3.4L overhead valve engines (the 3X crank sensor is also known as the 7X Crank Sensor).
How does the Ignition Control Module ( ICM ) work?
If everything is working properly, the engine will start. Now, the important thing to know is that the PCM controls the creation of spark from the get-go (crank up) and at all engine speeds thru’ the ignition control module (ICM).