Engine Coolant Temperature/Intake Air Temperature Correlation

Descripción

This code means the engine coolant temperature reading doesn't match the intake air temperature reading. The computer expects these temperatures to be related in a certain way, and they aren't.

Pasos de reparación

1. 1 Check for other related diagnostic trouble codes (DTCs) that may help pinpoint whether the coolant temperature or intake air temperature circuit is at fault.
2. 2 Inspect the engine coolant temperature (ECT) sensor connector and wiring for corrosion, damage, or loose connections.
3. 3 Inspect the intake air temperature (IAT) sensor connector and wiring for corrosion, damage, or loose connections.
4. 4 Use a scan tool to compare ECT and IAT sensor readings with the engine cold — both should read close to ambient temperature; a significant difference indicates a faulty sensor.
5. 5 Replace the engine coolant temperature (ECT) sensor if its reading is out of range or does not match ambient temperature on a cold engine.
6. 6 Replace the intake air temperature (IAT) sensor if its reading is out of range or does not match ambient temperature on a cold engine.
7. 7 Inspect the thermostat for proper operation — a stuck-open or stuck-closed thermostat can cause abnormal coolant temperature readings that trigger this code.
8. 8 Replace the thermostat if it is not opening or closing at the correct temperature.
9. 9 Have the engine control module (ECM) inspected and tested by a professional if all sensors, wiring, and thermostat are functioning correctly.

Diagnóstico y costo