Symptom:
*NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC
POSSIBLE CAUSES
CHECK PCM POWERS AND GROUNDS
PCM SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
PCM SCI RECEIVE CIRCUIT SHORTED TO VOLTAGE
PCM SCI CIRCUITS SHORTED TOGETHER
PCM SCI TRANSMIT CIRCUIT SHORTED TO GROUND
PCM SCI RECEIVE CIRCUIT SHORTED TO GROUND
PCM SCI RECEIVE CIRCUIT OPEN
PCM SCI TRANSMIT CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST ACTION APPLICABILITY
1 Perform the symptom Checking PCM Power and Ground Circuits in the Driveability
category.
NOTE: With the DRBIIIt in the generic scan tool mode, attempt to commu-
nicate with the PCM.
NOTE: If the DRBIIIt can communicate with the PCM in the generic scan
tool mode, it may not be necessary to perform this step.
Did the vehicle pass this test?
All
Yes → Go To 2
No → Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2 Turn the ignition off.
Disconnect the DRBIIIt from the DLC.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the PCM SCI Transmit circuit at the Data Link harness
connector (cav 7).
Is the voltage above 1.0 volt?
All
Yes → Repair the PCM SCI Transmit circuit for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No → Go To 3
3 Turn the ignition off.
Disconnect the DRBIIIt from the DLC.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the PCM SCI Receive circuit at the Data Link harness
connector (cav 12).
Is the voltage above 1.0 volt?
All
Yes → Repair the PCM SCI Receive circuit for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No → Go To 4
110
COMMUNICATION
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