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6E–284 4JH1 ENGINE DRIVEABILITY AND EMISSIONS • Poor connection at ECM and PSG-Inspect harness connectors for backed out terminals, improper • Damaged harness-Inspect the wiring harness for damage. If the harness appears to be OK, observe Diagnostic Trouble Code (DTC) P1650 (Symptom Code A) (Flash Code 44) CAN Device Offline Step Action Value(s) Yes No 1 Was the “On-Board Diagnostic (OBD) System Check” — Go to Step 2 Go to On Board Diagnostic (OBD) System Check 2 1. Connect the Tech 2. 2. Review and record the failure information. 3. Select “F0: Read DTC Infor As Stored By ECU” in “F0: Diagnostic Trouble Codes”. Is the DTC P1650 (Symptom Code A) stored as — Go to Step 3 Refer to Diagnostic Aids and Go to Step 3 3 1. Using the Tech 2, ignition “On” and engine “Off”. 2. Select “F1: Clear DTC Information” in “F0: Diagnostic Trouble Codes” with the Tech 2 and 3. Operate the vehicle and monitor the “F0: Read DTC Infor As Stored By ECU” in the “F0: Was the DTC P1650 (Symptom Code A) stored in this — Go to Step 4 Refer to Diagnostic Aids and Go to Step 4 4 Check for poor/faulty connection at the ECM or PSG — Verify repair Go to Step 5 5 Visually check the PSG (pump control unit). — Go to Step 18 Go to Step 6 6 Using the DVM and check the CAN high circuit. 1. Ignition “Off”, engine “Off”. 2. Disconnect the ECM connector and PSG (pump control unit) connector. 3. Check the circuit for short to CAN low circuit. Was the DVM indicated specified value? No continuity Go to Step 7 Repair faulty verify repair 100 99 1 2 C-57 E-6 2 1 E-6 |