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6. 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 (K854) Boost Pressure Sensor 5 Volt Supply circuit. Measure the resistance between ground and the (K854) Accelerator Pedal Position Sensor No. 2 5 Volt Supply Measure the resistance between ground and the (F855) Mass Airflow Sensor 5 Volt Supply circuit. Is the resistance above 1000 ohms for each circuit? Yes >> Go To 7 No >> Repair the 5-Volt Supply circuit that measured below 1000 ohms for a short to ground. Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 7. ENGINE CONTROL MODULE (ECM) Turn the ignition off. Inspect the (K853) Crankshaft Position Sensor 5 Volt Supply circuit between the Crankshaft Position Sensor and the Inspect the (K854) Boost Pressure Sensor 5 Volt Supply circuit between the Intake Air Temperature/Boost Pressure Inspect the (K854) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit between the Accelerator Pedal Inspect the (F855) Mass Airflow Sensor 5 Volt Supply circuit between the Mass Airflow Sensor and the ECM. 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. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Replace and program the Engine Control Module in accordance with the Service Information. Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1271 |