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5. (X635) BOOST PRESSURE SERVO MOTOR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (X635) Boost Pressure Servo Motor Con- Is the resistance below 10.0 ohms? Yes >> Go to 6 No >> Repair the (X635) Boost Pressure Servo Motor Control cir- cuit for an open circuit or high resistance. Perform the ECM Verification Test Ver. 1. (Refer to 9 - 6. 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 9 - 1076 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |