Fault Code 22


Description:  Coolant temperature sensor signal out of range
Power loss light:  On
Limp-in mode:  Radiator fan is turned on and the charge temperature sensor as an indication of the coolant temperature

Possible Causes

Coolant temperature sensor failure - The sensor should measure 9,120 ohms to 10,880 ohms at 77^F.  On 2.2L and 2.5L engines, this sensor is located on the right-hand side of the water box.

Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC).  Clean and regrease any corroded connectors with dielectric grease.  You may have disconnected the sensor if you recently set the base ignition timing.

Diagnostic Method

Trigger Parameters

- Sensor output less than 0.51V or greater than 4.96V

Results If Component Fails

Fault code 22 is stored, the power loss light is turned on, and the logic module will enter limp-in mode and turn on the radiator fan.  All models except 1988 and later Turbo I engines will use the charge temperature sensor as an indication of the coolant temperature.
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This page is maintained by Russell W. Knize and was last updated 08/28/98. Comments? Questions? Send email.

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