HOW TO CHECKING THE PCM POWER AND GROUNDS?

POSSIBLE CAUSES

  • FUSED B+ CIRCUIT OPEN
  • FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
  • PCM GROUND CIRCUIT(S) OPEN

DIAGNOSTIC PROCEDURE

NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.

  1. Turn the ignition off. Disconnect the PCM harness connectors. Using a 12-volt test light connected to 12-volts, check both ECM ground circuits in ECM harness connector. Did the test light illuminate for each cavity?
    Yes –> Go To 2
    No –> Repair the PCM Ground circuit(s) for an open.
  2. Turn the ignition off. Disconnect the PCM harness connectors. Turn the ignition on. Using a 12-volt test light connected to ground, check the Fused Ignition Switch Output circuit in PCM harness connector. Is the test light on?
    Yes –> Go To 3
    No –> Repair the Fused Ignition Switch Output circuit for an open.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Using a 12-volt test light connected to ground, check each Fused B+ circuit in the PCM harness connector. Does the test light illuminate brightly for each circuit?
    Yes –> Test Complete.
    No –> Repair the Fused B+ Output circuit for an open.
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