Cylinder head temperature sensor testing

The cylinder head temperature sensor (arrow) is installed in cylinder head 3. The cylinder head temperature sensor signal is the main temperature signal to the ECM.

Porsche Head Cylinder Temperature Sensor

Table j. Cylinder Head Temperature Sensor Resistance Specifications

Test temperature

Resistance

15 - 30 °C (60 - 85° F) 40°C (105°F) 80°C (175°F) 100°C (212°F) 130°C (265°F)

4.4 - 6.8 k£2 1.4- 3.6 k£2 1.0-1.3 k£2 250 - 390 £2 160-210 £2 90 £2

^ To test sensor:

• Disconnect harness plug from white connector on left side of engine (arrow).

• Connect ohmmeter across white connector terminals.

• Resistance should correspond to specifications listed in Table j.

• If any faults are found, replace sensor. Replacement procedure is covered later in this group.

An open (break) in the temperature sensor will cause the DME system to run rich. A short circuit in the temperature sensor causes leaner mixtures.

Table j. Cylinder Head Temperature Sensor Resistance Specifications

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