A/C Signal: Testing and Inspection

A/C CUT-OFF CONTROL INSPECTION
1. Start the engine and let it idle.
2. Turn the A/C switch and the fan switch ON.
3. Fully open the throttle valve. Then 3 - 6 seconds after, check if the operation sound of the A/C compressor electromagnetic clutch is heard.
4. If the operation sound is not heard, do as follows.
A. Connect the SSTs (NGS) to the data link connector-2.




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" function and check for the operation sound of the relay.

I. If the operation sound is heard, check the following.
- PCM terminal voltage
- Load/no load judgement signal
- Throttle position signal

II. If the operation sound is not heard, check the following.
- A/C relay
- Open circuit in wiring harnesses and connectors (Main relay - A/C relay - PCM)