Test Point 7

Test point 7

Motor of temperature
mixing valve

Signal implausible
Fault code 26

Diagnosis conditions

No control module fault stored.
No fault with supply voltage (5 volts).

Signal implausible

1. Check temperature mixing valve for smooth operation.

2. Unplug connectors A, B, C and D from the heating/air-conditioning control.

3. Unplug connector from the temperature mixing valve drive motor.

4. Connect ohmmeter to connector C 8 and drive motor connector pin 1.
Display: < 5 Ohms

Connect ohmmeter to connector B 8 and drive motor connector pin 2.
Display: < 5 Ohms

Connect ohmmeter to connector A 12 and drive motor connector pin 3.
Display: < 5 Ohms

Connect ohmmeter to connector D 10 and drive motor connector pin 4.
Display: < 5 Ohms

Connect ohmmeter to connector D 2 and drive motor connector pin 5.
Display: < 5 Ohms

5. Check wire from connector C 8 to drive motor pin 1 for short to B+ and short to ground.

6. Check wire from connector B 8 to drive motor pin 2 for short to B+ and short to ground.

7. Check wire from connector A 12 to drive motor pin 3 for short to B+.

8. Check wire from connector D 10 to drive motor pin 4 for short to B+ and short to ground.

9. Check wire from connector D 2 to drive motor pin 5 for short to B+ and short to ground.