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5. BOOST PRESSURE SERVO MOTOR Turn the ignition off. Connect the Engine Control Module (ECM) harness connector. Turn the ignition on. With the scan tool, actuate the Boost Pressure Servo Motor (Boost Using a 12 volt test light connected to 12 volts, check the (X635) Boost NOTE: The test light should be illuminated and bright. Compare NOTE: The circuit will remain actuated by the controller for 30 sec- Using a 12 volt test light connected to 12 volts, check the (X635) Boost NOTE: The test light should not be illuminated. NOTE: The circuit will remain actuated by the controller for 30 seconds. Be certain the actuation is active Is the test light illuminated and bright with the actuation at 100% and not illuminated with the actuation Yes >> Replace the Boost Pressure Servo Motor in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go to 6 6. ENGINE CONTROL MODULE (ECM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes >> Repair as necessary. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Replace the Engine Control Module (ECM) in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 9 - 1072 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |