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• When Monitored: • Set Condition: Possible Causes INTERMITTENT CONDITION ASD RELAY OUTPUT CIRCUIT OPEN VR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND VR SOLENOID CONTROL CIRCUIT OPEN VACUUM RESERVOIR SOLENOID ENGINE CONTROL MODULE Diagnostic Test 1. CHECK FOR ACTIVE DTC 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 ECM DTCs. Start the engine several times, turning the ignition off for at least 10 seconds between engine run cycles. Monitor the scan tool for ECM DTCs. Did this DTC set again? Yes >> Go To 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. ASD OUTPUT CKT OPEN Turn the ignition off. Disconnect the Vacuum Reservoir Solenoid harness connector. Turn the ignition on. Using a 12-volt test light connected to ground, check the ASD Relay Does the test light illuminate brightly? Yes >> Go To 3 No >> Repair the ASD Relay Output circuit for an open. Perform the ECM Verification Test Ver. 1 (Refer to 9 - 9 - 1262 ENGINE DIESEL DIAG KJ |