System Inspection
SYSTEM INSPECTION1. Position the vehicle on a chassis roller and start the engine.
2. Shift the selector lever into other than P and N.
3. Turn the A/C switch and the fan switch on.
4. Fully open the throttle valve. Then, 3-6 seconds after, check if the operation sound of the A/C compressor electromagnetic clutch is heard.
5. If the operation sound is not heard, do as follows.
(1) Connect the special service tool (SST) new generation star tester (NGS).
(2) Select the SIMULATION TEST function on the NGS display.
(3) Turn the A/C relay from OFF to ON by using the "A/C RLY" and check for the operation sound of the relay.
I. If the operation sound is heard, check the following.
^ ECM terminal voltage
^ Load/no load distinction signal
^ Closed throttle position signal
II. If the operation sound is not heard, check the following.
^ A/C relay
^ Open circuit in wiring harnesses and connector (Main relay - A/C relay - ECM)