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• When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC (C27) A/C COMPRESSOR CONTROL CIRCUIT SHORTED TO GROUND (C27) A/C COMPRESSOR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE A/C COMPRESSOR ENGINE CONTROL MODULE (ECM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, Clear DTCs in the Engine Control Module (ECM). 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 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. (C27) A/C COMPRESSOR CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the A/C Compressor harness connector. Disconnect the Engine Control Module (ECM) harness connector. Measure the resistance between ground and the (C27) A/C Compressor Control circuit in the A/C Compressor har- Is the resistance below 1000.0 ohms? Yes >> Repair the (C27) A/C Compressor Control circuit for a short to ground. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go to 3 3. (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 4 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) PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1263 |