A/C Signal: Testing and Inspection

1. 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.
- If the operation sound is not heard, proceed to next step.
5. Turn the ignition switch ON.
6. Turn the A/C relay from OFF to ON by connecting a jumper wire between LG/Y terminal of A/C relay connector and ground, and inspect for the operation sound of the relay.
- If the operation sound is heard, check the PCM terminal voltage.
- Load/no load distinction signal
- Closed throttle position signal
- 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 - PCM)