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• When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO GROUND (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO THE (K957) MASS AIR FLOW SENSOR MASS AIR FLOW SENSOR 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). 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 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. 9 - 1128 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |