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5. (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (K957) Mass Air Flow Sensor Ground cir- Is the resistance below 10.0 ohms? Yes >> Go to 6 No >> Repair the (K957) Mass Air Flow Sensor Ground circuit for an open circuit or high resistance. Perform the ECM Verification Test Ver. 1. (Refer to 9 - 6. MASS AIR FLOW SENSOR Turn the ignition off. Connect the Engine Control Module (ECM) connector. Replace the Mass Air Flow Sensor in accordance with the Service Information. Turn the ignition on. With the scan tool, Clear DTCs. Start the engine and allow it to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes >> Go to 7 No >> Test Complete. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 7. ENGINE CONTROL MODULE (ECM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Mass Air Flow Sen- Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. 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 - 983 |