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• When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC (K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO VOLTAGE (k604) EGR AIRFLOW CONTROL VALVE SIGNAL CIRCUIT SHORTED TO VOLTAGE (K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO GROUND (K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO (K604) EGR AIRFLOW CONTROL (K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE (k604) EGR AIRFLOW CONTROL VALVE SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE EGR AIRFLOW CONTROL VALVE 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). With the scan tool, actuate the EGR Airflow Control Valve at 100%. 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. (K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the EGR Airflow Control Valve harness connector. Disconnect the Engine Control Module (ECM) harness connector. Remove the Main Relay. Connect a jumper wire between cavity B7 and cavity B9 of the Main Turn the ignition on. Measure the voltage of the (K601) EGR Airflow Control Valve Control Is there any voltage present? Yes >> Repair the (K601) EGR Airflow Control Valve Control circuit for a short to voltage. Perform the ECM Verification Test Ver. 1. (Refer to 9 - No >> Go to 3 PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1131 |