You will need a scan tool capable of reading live data.
Below are the description and the flow chart for testing. The PCM is what controls the firing of the injectors.
The Vehicle Control Module (VCM) has integrated circuits that are fault protected, therefore, if a circuit has failed, the integrated circuits may not be damaged. If this is the case, the Ignition Control (IC) will keep the circuit open until you have corrected the fault in the circuit. When you have corrected the fault, reinstall the VCM. Check the circuit. Replace the VCM only if the circuit is still inoperative.
The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the ignition feed circuit to the injectors are OK.
6. This step determines if the injector control circuits are OK.
8. This step determines if there is an internal VCM short to ground for an injector control circuit.
Images (Click to enlarge)
Friday, July 24th, 2020 AT 12:32 PM