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4. (V937) S/C SWITCH GROUND CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. 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 (V937) S/C Switch Ground circuit. Is there any voltage present? Yes >> Repair the (V937) S/C Switch Ground circuit for a short to voltage. Perform the ECM Verification Test Ver.1. (Refer to 9 - No >> Go to 5 5. S/C SWITCH Turn the ignition off. Connect the Engine Control Module (ECM) harness connector. Turn the ignition on. With the scan tool, monitor the S/C Switch Voltage. While monitoring the scan tool, connect a jumper wire between the (V72) S/C Switch 2 Signal circuit and the (V937) Does the scan tool display below 0.1 volt with the jumper wire in place? Yes >> Replace the Speed Control Switch in accordance with the Service Information. Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go to 9 PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1211 |