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de1: Service Code 21: Check Engine Operating Temperature
Steps _Run engine at 2000 RPM for 2 minutes or until inlet radiator hose is hot and pressurized. _Key Off, wait 10 seconds _Rerun Engine Running Self-Test
Result Is Code 21 still present?
Direction YES

GO to Continue


Service other codes as necessary

Notes If vehicle stalls, do not service code 21 at this time. Refer to diagnostic by procedure.

ECT Information:
ComponentEngine Coolant Temperature Sensor
DescriptionThe ECT sensor reports the engine coolant temperature to the EEC.

The ECT signal input is used by the EEC to:
Modify ignition timing
EGR flow
Air to fuel ratio
LocationThreaded into between Fuel Injectors 2 and 3
Wire ColorsLight Green with Yellow stripe
Black with White stripe