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• When Monitored: • Set Condition: Possible Causes ASD RELAY OUTPUT CIRCUIT OPEN ECM - 5-VOLT SUPPLY CIRCUIT MAF SENSOR GROUND OPEN MASS AIRFLOW SENSOR MAF SENSOR 5 VOLT SUPPLY CIRCUIT OPEN MAF SENSOR SIGNAL CIRCUIT OPEN MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO THE MAF SENSOR GROUND CIRCUIT MAF SENSOR SIGNAL CIRCUIT SHORTED TO GROUND ECM SENSOR GROUND CIRCUIT OPEN MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND MAF SENSOR SIGNAL CIRCUIT SHORTED TO THE MAF SENSOR GROUND CIRCUIT MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE MAF SENSOR CIRCUIT SHORTED TO VOLTAGE ECM - MAF SENSOR SIGNAL CIRCUIT Diagnostic Test 1. VERIFY ACTIVE DTC NOTE: If DTC P0641, P0651 or P0697 is present with this DTC, diagnose DTCs P0641, P0651 or P0697 before NOTE: Inspect the turbocharger inlet tube between the MAF Sensor and the turbocharger for damage, NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may With the scan tool, erase the ECM DTCs. Test drive the vehicle. With the scan tool, read the ECM DTCs. Does the scan tool display a Mass Air Flow Sensor DTC? Yes >> Go To 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 9 - 742 ENGINE DIESEL DIAG KJ |