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• When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC (K43) O2 1/1 POSITIVE CURRENT CONTROL CIRCUIT SHORTED TO VOLTAGE (K43) O2 1/1 POSITIVE CURRENT CONTROL CIRCUIT SHORTED TO GROUND (K43) O2 1/1 POSITIVE CURRENT CONTROL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY (K43) O2 1/1 POSITIVE CURRENT CONTROL CIRCUIT SHORTED TO THE (K99) O2 1/1 HEATER CONTROL (K43) O2 1/1 POSITIVE CURRENT CONTROL CIRCUIT OPEN OR HIGH RESISTANCE OXYGEN 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). Start the engine. Allow the engine to reach normal operating temperature. 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. (K43) O2 1/1 POSITIVE CURRENT CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Oxygen 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 (K43) O2 1/1 Positive Current Control circuit Is there any voltage present? Yes >> Repair the (K43) O2 1/1 Positive Current Control 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 - 1748 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |