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 NO Service other codes as necessary |
| Notes | If vehicle stalls, do not service code 21 at this time. Refer to diagnostic by procedure. |
| Component | Engine Coolant Temperature Sensor |
| Description | The 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 |
| Location | Threaded into between Fuel Injectors 2 and 3 |
| Wire Colors | Light Green with Yellow stripe
Black with White stripe |
| Image |  |