Grand AM L4-138 2.3L VIN A MFI (1992)
PCM is receiving ignition pulses during engine cranking or when running.
27.
By installing the spark plug jumper leads and testing for spark on all 4 plug wire leads, each ignition coil's ability to produce at least 25,000 volts
is verified.
28.
The fuel pump is turned "ON" by the PCM for 2-3 seconds after the ignition is first turned "ON". This step checks to see if the fuel pump and fuel
pump relay are operating correctly and if the fuel pressure is within the proper range. Refer to Chart A-7 - Fuel System Diagnosis for the fuel
pressure gage installation procedure.
30.
Ignition voltage is supplied to the injectors and fuel pump for the first 2 seconds when the ignition is turned "ON" and continuously when the
engine is cranked. If the fuel pump runs but the injector test light did not blink, then the injector ignition feed circuit is open between the injector
and the splice from the ignition feed circuit.
31.
This step verifies that the PCM is sending a signal to the ICM to fire the ignition coils. If the test light blinks, then the signal is OK to this point
and the no spark condition lies in the ignition coil harness or the ignition coil that did not produce spark.
32.
The ignition coil harness can easily be checked by performing the previous step with the ignition coil harness connected to the CM. Check for a
voltage and ground signals to the ignition coils at the ignition coil electrical connector.
33.
This step checks the ignition control circuits and the PCM.
