A/C Cut-Off Control System
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.
A Connect the Special Service Tools New Generation Star (NGS) tester.
B Select the SIMULATION TEST function on the NGS display.
C 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)