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P0647-HIGH VOLTAGE DETECTED AT THE A/C CLUTCH RELAY (CONTINUED) 3. FUSED BATTERY SUPPLY Ignition off. Disconnect the ECM connectors. Remove the A/C clutch relay. NOTE: Check connectors - Clean/repair as necessary. Measure the voltage on the Fused Battery Supply circuit between the PDC and battery negative. Is the voltage less than 1 volt? Yes >> Go To 4 No >> Repair the short to voltage. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 4. A/C CLUTCH RELAY Remove the A/C Clutch Relay from the PDC. NOTE: Check connectors - Clean/repair as necessary. Is the resistance less than 10 Ohms? Yes >> Go To 5 No >> Replace the A/C clutch relay. Perform POWERTRAIN VERIFICATION TEST VER - 1 5. ECM Reconnect the ECM harness connectors. Reinstall the A/C clutch relay. With the scan tool, actuate the A/C clutch relay. Turn the ignition on. While monitoring with the scan tool, disconnect the A/C Clutch Relay from the PDC. Did DTC P0646 set? Yes >> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 9 - 1374 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL DR/DH |