Test E: The Air Conditioning (A/C) Is Inoperative/Does Not Operate Correctly
PINPOINT TEST E: THE AIR CONDITIONING (A/C) IS INOPERATIVE/DOES NOT OPERATE CORRECTLYNormal Operation
Under normal operation, when A/C is requested a message is sent over the medium-speed controller area network (MS-CAN) bus to the instrument cluster, then from the instrument cluster through the high-speed controller area network (HS-CAN) bus to the PCM. Battery voltage for the A/C clutch relay contacts is provided through circuit SBB13 (GY/RD). When the PCM receives the request, the A/C pressure transducer does not indicate excessive pressure and the evaporator temperature sensor does not indicate a low evaporator temperature, it energizes the relay sending battery voltage to the A/C clutch through circuit CH401 (VT/WH). Ground is supplied for the A/C clutch through circuit GD120 (BK/GN).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- PCM
- HVAC module
- A/C evaporator discharge temperature sensor
- A/C pressure transducer
- A/C compressor clutch field coil
- A/C control relay
- A/C clutch air gap
E1-E6:
E6-E7:
