Test Point

Temperature Sensor II (Engine Temperature)

1. Check plug connection on temperature sensor II for tight fit and clean contacts.

Porsche 928 Engine Lift Points

2. Connect ohmmeter on terminals 2 and 5 of disconnected LH multiple pin plug.

Specifications:

0 °C/ 32 °F = 4.4-6.8 kH 15 to 30 °C/59 to 86 °F = 1.4 - 3.6 ki2 40 °C/ 104 °F = 0.9 -1.3 kft 60 °C/ 140 °F = 480 - 720 i2 80 °C/ 176 °F = 250- 390 ft

If specified values are not reached, repeat same tests on the temperature sensor direct.

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Note:

Two independent temperature sensors are installed in the temperature sensor housing.

Connect tester on only one contact of the sensor and a second test lead on ground.

Temperature sensor II provides the LH control unit with information on the instantaneous engine temperature. It enriches the fuel/air mixture for cold starting and engine warm-up.

In case of interruption (inf. ohms): excessively rich mixture, engine will not run in warm state and cannot be started.

In case of short circuit (0 ohm): mixture too lean, no pickup in cold state.

In case of interruption, wires could be bridged for emergency operation of the car.

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