Test Point 8

TEST POINT 8
motor, Central Valve Signal Implausible

DTC 27

Fault Effect: Valve cannot be adjusted

Diagnosis Conditions
- No control module fault stored.
- No fault on the supply voltage (5 Volts).

Signal Implausible

1. Check central valve for smooth operation.

2. Pull off connectors A, B, C and D on the heating/air conditioning control.

3. Pull off connector on the central valve drive motor.

4. Check drive motor circuits for continuity.

- 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.