Initial Inspection
ON-VEHICLE INSPECTION1. INSPECT PRESSURE SWITCH NO.1.
a. Magnetic clutch control:
Inspect pressure switch operation.
1. Set on the manifold gauge set.
2. Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (-) lead to terminal 1.
3. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.
If operation is not as specified, replace the pressure switch.
b. Cooling fan control:
Inspect pressure switch operation.
1. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 3.
2. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.
If operation is not as specified, replace the pressure switch.
2. INSPECT AIR CONDITIONING CONTROL ASSY
Wire Harness Side:
a. Disconnect the connector from controller and inspect the connector on wire harness side, as shown in the chart.
If circuit is as specifies, try replacing the controller with a new one. If the circuit is not as specified, inspect the circuits connected to other parts.
Part 1:
Part 2:
b. Connect the connector to heater controller and inspect wire harness side from the back side, as shown in the chart.
If circuit is as specified, try replacing the controller with a new one. If the circuit is not as specified, inspect the circuits connected to other parts.
3. INSPECT ECM
If circuit is as specified, try replacing the amplifier with a new one. If the circuit is not as specified, inspect the circuits connected to other parts.