Initial Inspection and Diagnostic Overview

1. Start the engine and let it idle.
2. Turn the A/C switch and the fan switch ON.
3. Check if the operation sound of the A/C compressor electromagnetic clutch is heard. (A/C compressor starts to work.)
4. Fully open the throttle valve. Check if the operation sound the A/C compressor magnetic clutch is heard. (A/C compressor stops to work.) Then, 3-6 seconds after, check if the operation sound of the A/C compressor electromagnetic clutch is heard.
5. Turn the A/C switch and the fan switch OFF.
6. If the operation sound is not heard, do as follows.
(1) Connect a jumper wire between both terminals of A/C pressure switch connector.
(2) Turn the ignition switch ON.
(3) Turn the A/C switch and the fan switch ON. Verify that operation sound is heard from A/C relay.
(4) If the operation sound is heard, check the following PID using NGS tester.
- TP V PID.
(5) If the operation sound is not heard, check the following.
- A/C relay.
- Open or short to ground circuit in wiring harnesses and connectors (Main relay-A/C relay-PCM terminal 69)
- A/C related parts.