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3. FUEL PRESSURE SENSOR SHORTED TO GROUND Turn the ignition off. Disconnect the Fuel Pressure Sensor harness connector. Turn the ignition on. Measure the voltage of the (K350) Fuel Pressure Sensor 5 Volt Supply Is the voltage above 4.6 volts? Yes >> Replace the Fuel Pressure Sensor. Perform the ECM VERIFICATION TEST. (Refer to 9 - No >> Go To 4 4. BOOST PRESSURE SENSOR SHORTED TO GROUND Turn the ignition off. Disconnect the Boost Pressure Sensor harness connector. Turn the ignition on. Measure the voltage of the (K356) Boost Pressure Sensor 5 Volt Supply Is the voltage above 4.6 volts? Yes >> Replace the Boost Pressure Sensor. Perform the ECM VERIFICATION TEST. (Refer to 9 - No >> Go To 5 5. 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the ECM harness connectors. Measure the resistance between ground and the (K853) Crankshaft Position Sensor 5 Volt Supply circuit. Measure the resistance between ground and the (K350) Fuel Pressure Sensor 5 Volt Supply circuit. Measure the resistance between ground and the (K356) Boost Pressure Sensor 5 Volt Supply circuit. Is the resistance above 1000 ohms for each circuit? Yes >> Go To 6 No >> Repair the 5-Volt Supply circuit for a short to ground. Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 9 - 1548 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |