Test Point 8

Test point 8
Motor, central valve
Signal implausible

DTC 27

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

Signal implausible
1. Check central 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 central valve drive motor.
4. Connect ohmmeter to connector A 12 and drive motor connector pin 1.
Display: < 5 Ohms
Connect ohmmeter to connector B 9 and drive motor connector pin 2.
Display: < 5 Ohms
Connect ohmmeter to connector C 8 and drive motor connector pin 3.
Display: < 5 Ohms
Connect ohmmeter to connector D 4 and drive motor connector pin 4.
Display: < 5 Ohms
Connect ohmmeter to connector D 12 and drive motor connector pin 5.
Display: < 5 Ohms

5. Check wire from connector A 12 to drive motor pin 1 for short to B+.
6. Check wire from connector B 9 to drive motor pin 2 for short to plus and short to ground.
7. Check wire from connector C 8 to drive motor pin 3 for short to plus and short to ground.
8. Check wire from connector D 4 to drive motor pin 4 for short to plus and short to ground.
9. Check wire from connector D 12 to drive motor pin 5 for short to B+ and short to ground.