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Symptom: P1281-ENGINE IS COLD TOO LONG When Monitored and Set Condition: P1281-ENGINE IS COLD TOO LONG When Monitored: The ignition key on, engine running. Set Condition: The engine does not warm to 176 deg. F while driving for 20 minutes after start. POSSIBLE CAUSES ENGINE COLD TOO LONG ECT SENSOR OPERATION TEST ACTION APPLICABILITY 1 Note: The best way to diagnose this DTC is to allow the vehicle to remain t, set the engine RPM to 1500 and allow the engine to warm up for 10-15 minutes. t, monitor the ENG COOLANT TMP DEG value during the warm up cycle. Make sure the transition of temperature change is smooth. All Yes → Go To 2 No → Refer to the Service Information for cooling system performance diagnosis. The most probable cause is a Thermostat problem. 2 WARNING: MAKE SURE THE ENGINE COOLING SYSTEM IS COOL BE- t, read and record the ECT Sensor Temperature value. Using the DRB Temperature Probe #CH7050, measure the engine coolant tempera- All Yes → Test Complete. No → Replace the ECT Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 2. 139 DRIVEABILITY - GAS |