Test NTC-16: Checking A/C System Operation
NOTE:
For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-2 to ensure system is functioning properly. Ensure no DTCs are present before performing this test.
NOTE:
Ensure A/C system is properly charged before performing procedure.
- Turn ignition off. Disconnect A/C compressor clutch connector. Measure resistance between ground and Black wire at A/C compressor clutch. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between A/C compressor clutch and ground. Ground is located at right rear of cylinder block.
- Remove A/C clutch relay from Power Distribution Center (PDC). See Figure. PDC is located on left side of engine compartment. Measure resistance of Dark Blue/Black wire between A/C compressor clutch harness connector and terminal "D" at A/C clutch relay socket in PDC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Black wire.
- Measure voltage between ground and terminal "B" (Red/Brown wire) at A/C clutch relay socket in PDC. See Figure. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, check for open in Red/Brown wire between A/C clutch relay and fuse "B" (30-amp) at PDC. Repair wiring as necessary. Also check fuse "B" in PDC. Replace fuse as necessary.
- Reinstall A/C clutch relay. Turn ignition on. Using scan tool, actuate A/C clutch relay. Measure voltage between ground and Dark Blue/Black wire at A/C compressor clutch harness connector. If voltage changes from zero volts to 11 volts, replace A/C compressor clutch coil. If voltage does not change from zero volts to 11 volts, go to next step.
- At this time, A/C clutch relay is assumed to be defective. Replace A/C clutch relay.