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• When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC (K343) FUSED ASD RELAY OUTPUT 2 CIRCUIT OPEN OR HIGH RESISTANCE (Z921) GROUND CIRCUIT OPEN OR HIGH RESISTANCE GLOW PLUG MODULE ENGINE CONTROL MODULE (ECM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. DTC IS ACTIVE NOTE: Diagnose and repair any system voltage or ASD Relay DTCs before continuing with this test. With the scan tool, Clear DTCs in the Engine Control Module (ECM). With the scan tool, actuate the Glow Plugs. Monitor the scan tool for at least two minutes. 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. (K343) FUSED ASD RELAY OUTPUT 2 CIRCUIT OPEN OR HIGH RESISTANCE Turn the ignition off. Disconnect the Glow Plug Module connector. Turn the ignition on. Using a 12 volt test light connected to ground, check the (K343) Fused NOTE: The test light should be illuminated and bright. Compare Is the test light illuminated and bright? Yes >> Go to 3 No >> Repair the (K343) Fused ASD Relay Output 2 circuit for an open circuit or high resistance. Perform the ECM Verification Test Ver. 1. (Refer to 9 - 9 - 1632 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |