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NOTE: The scan tool should display a Pre-Catalyst Exhaust Temperature Sensor high voltage or open cir- Does the scan tool display the DTC as described above? Yes >> Replace the Pre-Catalyst Exhaust Temperature Sensor 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 Pre-Catalyst Exhaust Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. 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 - 1484 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |