Diagnostic Procedure

NO RESPONSE FROM PCM (SCI ONLY) - DIAGNOSTIC PROCEDURE

TEST	ACTION	APPLICABILITY
1	Perform the symptom Checking PCM Power and Ground Circuits in the DRIVEABILITY -- GAS . NOTE: With the DRBIII® in the generic scan tool mode, attempt to communicate with the PCM. NOTE: If the DRBIII® 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? Yes : Go To 2 No : Repair as necessary. Perform POWERTRAIN VERIFICATION TEST .	All
2	Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the DRB from the DLC. Measure the resistance between ground and the SCI Transmit circuit. Is the resistance below 5.0 ohms? Yes : Go TO 3 No : Go To 5	All
3	Turn the ignition off. Disconnect the CAB harness connector (if equipped). NOTE: If vehicle is not equipped with antilock brakes, answer yes to the question. Measure the resistance between ground and the SCI Transmit circuit. Is the resistance below 5.0 ohms? Yes : Go TO 4 No : Replace the Controller Antilock Brake in accordance with the service information. Perform POWERTRAIN VERIFICATION TEST .	All
4	Turn the ignition off. Disconnect the TCM harness connector (if equipped). NOTE: If vehicle is not equipped with a TCM, answer yes to the question. Measure the resistance between ground and the SCI Transmit circuit. Is the resistance below 5.0 ohms? Yes : Repair the SCI Transmit circuit for a short to ground. Perform POWERTRAIN VERIFICATION TEST . No : Replace the Transmission Control Module in accordance with the service information. Perform POWERTRAIN VERIFICATION TEST .	All
5	Turn the ignition off. Disconnect the DRB from the DLC. Disconnect the PCM harness connectors. Disconnect the TCM harness connector (if equipped). Disconnect the CAB harness connector (if equipped). Turn the ignition on. Measure the voltage of the SCI Transmit circuit at the DLC connector (cav 7). Is the voltage above 1.0 volt? Yes : Repair the SCI Transmit circuit for a short to voltage. Perform POWERTRAIN VERIFICATION TEST . No : Go To 6	All
6	Turn the ignition off. Disconnect the DRB from the DLC. Disconnect the PCM harness connectors. Turn the ignition on. Measure the voltage of the SCI Receive circuit at the DLC connector (cav 6). Is the voltage above 1.0 volt? Yes : Repair the SCI Receive circuit for a short to voltage. Perform POWERTRAIN VERIFICATION TEST . No : Go To 7	All
7	Turn the ignition off. Disconnect the DRB from the DLC. Disconnect the PCM harness connectors. Measure the resistance between the SCI Transmit circuit and the SCI Receive circuit at the PCM connector. Is the resistance below 5.0 ohms? Yes : Repair the short between the SCI Transmit and the SCI Receive circuits. Perform POWERTRAIN VERIFICATION TEST . No : Go To 8	All
8	Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the DRB from the DLC. Measure the resistance between ground and the SCI Receive circuit. Is the resistance below 5.0 ohms? Yes : Repair the SCI Receive circuit for a short to ground. Perform POWERTRAIN VERIFICATION TEST . No : Go To 9	All
9	Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the DRB from the DLC. Measure the resistance of the SCI Receive circuit between the PCM connector and the DLC. Is the resistance below 5.0 ohms? Yes : Go To 10 No : Repair the SCI Receive circuit for an open. Perform POWERTRAIN VERIFICATION TEST .	All
10	Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the DRB from the DLC. Measure the resistance of the SCI Transmit circuit between the PCM connector and the DLC. Is the resistance below 5.0 ohms? Yes : Go To 11 No : Repair the SCI Transmit circuit for an open. Perform POWERTRAIN VERIFICATION TEST .	All
11	If there are no possible causes remaining, view repair. Repair: Replace and program the Powertrain Control Module in accordance with the Service Information. Perform POWERTRAIN VERIFICATION TEST .	All