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P1281-ENGINE IS COLD TOO LONG For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes ENGINE COLD TOO LONG ECT SENSOR OPERATION Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - 1. CHECK COOLING SYSTEM PERFORMANCE NOTE: The best way to diagnose this DTC is to allow the vehicle to remain outside overnight in order to NOTE: Extremely cold outside ambient temperatures may cause this DTC to set. Start the engine. With the scan tool, set the engine RPM to 1500 and allow the engine to warm up for 10-15 minutes. With the scan tool, monitor the ENG COOLANT TMP DEG value during the warm up cycle. Make sure the transition Did the engine temperature reach a minimum of 80° C (176° F)? Yes >> Go To 2 No >> Refer to the Service Information for cooling system performance diagnosis. The most probable cause is a Thermostat problem. Also, refer to any related TSBs. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. ECT SENSOR OPERATION WARNING: WARNING: MAKE SURE THE ENGINE COOLING SYSTEM IS COOL BEFORE REMOVING THE Using the DRB Temperature Probe #CH7050, measure the engine coolant temperature. NOTE: The t-stat housing area should be around 192-195 at start to open. Is the ECT Sensor value with -15°C (5°F) of the temperature probe reading? Yes >> Test Complete. No >> Replace the ECT Sensor. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 1930 ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10 DR/DH |