Test Point 7

Test point 7
Motor, temperature mixing valve
Signal implausible

DTC 26

Diagnosis conditions
No control module fault stored.
No fault on the supply voltage (5 Volt).

Signal implausible
1. Check temperature mixing valve for smooth operation.
2. Pull off connectors A, B, C and D on the heating/air cond. control.
3. Pull off connector on 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 plus and short to ground.
6. Check wire from connector B 8 to drive motor pin 2 for short to plus 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 plus and short to ground.