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P0478-HIGH VOLTAGE ON THE ENGINE BRAKE DRIVER (CONTINUED) 3. Engine Brake Driver Control Circuit Turn the ignition off. Remove the Engine Brake Driver Relay. Disconnect the ECM harness connectors. Check connectors - Clean/repair as necessary. Measure the voltage of the Engine Brake Driver Control Circuit between the relay terminal and battery negative. Is the voltage less than 1 volt? Yes >> Go To 4 No >> Repair Engine Brake Driver Control Circuit shorted to voltage. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 4. Engine brake relay Measure the resistance between terminals 85 and 86 of the engine brake relay. Is the resistance less than 10 ohms? Yes >> Replace the engine brake relay. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- No >> Go To 5 5. ECM Reconnect the ECM harness connectors. Reinstall the Engine Brake relay. Ignition on, engine not running. While monitoring with the scan tool, remove the Engine Brake Driver Relay. Did P0477 set? Yes >> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 9 - 1266 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL DR/DH |