Diesel Data: Automotive Repair

On-Vehicle Inspection

AIR CONDITIONING CONTROL SYSTEM

ON-VEHICLE INSPECTION
1. DISCONNECT COMBINATION MATER
2. DISCONNECT ECM
3. INSPECT A/C CONDITIONING CONTROL SYSTEM CIRCUIT
a. Disconnect the connector from the combination meter and inspect the connector on the wire harness side, as shown in the diagram.

Test condition:
Turn ignition switch to ON

Combination Meter (Wire Harness Side):





If the circuit is not as specified, inspect the circuits connected to other parts.

b. Reconnect the connector to combination meter and inspect the wire harness side from the back side, as shown in the diagram.

Test condition:
- Run engine at idle speed
- Set on manifold gauge set

Combination Meter (From Back Side):





If the circuit is not as specified, inspect the circuits connected to other parts.

c. Inspect the wire harness side connector of the ECM from the back side, as shown in the diagram.

ECM (From Back Side):





If the circuit is not as specified, inspect the circuits connected to other parts.

4. RECONNECT ECM
5. RECONNECT COMBINATION METER