Test Point 3

TEST POINT 3
Interior Temperature Sensor Open Circuit, Short To Ground

DTC 22

Fault Effect: Substitute value: 22 °C

Diagnosis Conditions
- No control module fault stored.
- No fault on the supply voltage (5 Volts).
- Outside temperature higher than - 40 °C.

Open Circuit

1. Pull off connector A on the heating/air conditioning control.

2. Connect ohmmeter to connector A-10 and A-12.

Display: approx. 3 kohms @ 23 °C

Note:
The wires to the interior temperature sensor are routed via two additional plug connections on the heating/air conditioning control.

3. Pull off connector on the interior temperature sensor.

4. Connect ohmmeter to connector A-10 and interior sensor connector pin 5.

Display: < 5 ohms

5. Connect ohmmeter to connector A-12 and interior sensor connector pin 4.

Display: < 5 ohms

6. Connect voltmeter to connector A-10 and ground. Switch on ignition.

Display: 0 Volts

If approx. 5 Volts is displayed, check the wiring for pinching and chafing.

Short to Ground

1. Pull off connector A on the heating/air conditioning control.

2. Connect ohmmeter to connector A-7 and ground.

Display: infinity

If 0 - 5 ohms is displayed, check the wiring for pinching and chafing.