porsche Workshop Repair Guides

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Thermostat Monitoring|Page 1303 > < Thermostat Monitoring
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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature Sensor Monitoring

Engine Coolant Temperature Sensor Monitoring

Range Check

The engine coolant temperature is electrical O.K., if the following condition is true:

Diagnosis threshold min. < engine coolant temperature < Diagnosis threshold max.

Plausibility Check low-side

The engine coolant temperature is plausible, if: 

(reference temperature - threshold) < engine coolant temperate

Plausibility Check high-side

The engine coolant temperature is plausible, if: 

(engine coolant temperature - reference temperature) > threshold

Thermostat Monitoring|Page 1303 > < Thermostat Monitoring