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3. (C27) A/C COMPRESSOR CONTROL CIRCUIT SHORTED TO THE (K343) FUSED MAIN RELAY OUTPUT Turn the ignition off. Measure the resistance between the (C27) A/C Compressor Control circuit and the (K343) Fused Main Relay Output Is the resistance above 10.0 ohms? Yes >> Go to 4 No >> Repair the (C27) A/C Compressor Control circuit for a short to the (K343) Fused Main Relay Output circuit. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 4. (C27) A/C COMPRESSOR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (C27) A/C Compressor Control circuit between the A/C Compressor harness connec- Is the resistance below 10.0 ohms? Yes >> Go to 5 No >> Repair the (C27) A/C Compressor Control circuit for an open circuit or high resistance. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 5. A/C COMPRESSOR Connect the Engine Control Module (ECM) harness connector. Install a known good relay in place of the vehicle’s A/C Compressor. Turn the ignition on. With the scan tool, Clear DTCs. With the scan tool, actuate the A/C Compressor. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes >> Go to 6 No >> Replace the A/C Compressor in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 6. ENGINE CONTROL MODULE (ECM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the A/C Compressor and Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes >> Repair as necessary. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Replace the Engine Control Module (ECM) in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1267 |