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2. VERIFY SENSOR 5 VOLT SUPPLY NOTE: A malfunctioning EGR system can cause this DTC to set. Disconnect the MAF Sensor harness connector. Turn the ignition on. Measure the voltage of the MAF Sensor 5 Volt Supply circuit in MAF Is the voltage between 4.8 and 5.2 volts? Yes >> Go To 3 No >> Go To 11 3. MAF SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the MAF Sensor harness connector. Disconnect the ECM harness connectors. Remove the ASD Relay from the PDC. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Turn the ignition on. Measure the voltage of the MAF Sensor Signal circuit. Is the voltage above 1.0 volt? Yes >> Repair the MAF Sensor Signal circuit for a short to voltage. Perform the ECM Verification Test Ver. 1 (Refer to 9 - No >> Go To 4 4. MAF SENSOR SIGNAL CIRCUIT OPEN Turn the ignition off. Disconnect the MAF Sensor harness connector. Disconnect the ECM harness connectors. Measure the resistance of the MAF Sensor Signal circuit. Is the resistance below 10.0 ohms? Yes >> Go To 5 No >> Repair the MAF Sensor Signal circuit for an open Perform the ECM Verification Test Ver. 1 (Refer to 9 - 9 - 750 ENGINE DIESEL DIAG KJ |