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• When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC (K668) INLET AIR PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE (K68) INLET AIR PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE (K900) INLET AIR PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE (K68) INLET AIR PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE (K900) INLET AIR PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE INLET AIR PRESSURE 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). Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. Start the engine. Allow the engine 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. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. (K668) INLET AIR PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Inlet Air Pressure Sensor connector. Disconnect the Engine Control Module (ECM) connector. Remove the ASD Relay from the IPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Turn the ignition on. Measure the voltage of the (K668) Inlet Air Pressure Sensor 5 Volt Sup- Is there any voltage present? Yes >> Repair the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit for a short to voltage. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go to 3 9 - 1168 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |