Checking A/C System Operation With No DTCs

Test 1 - 3:

Test 4 - 9:

Test 10 - 12:

SYMPTOM
CHECKING A/C SYSTEM OPERATION WITH NO DTCS

POSSIBLE CAUSES
- DTC and communication present
- A/C select circuit open
- A/C select in HVAC
- PCM
- A/C request circuit open
- Refrigeration system not properly charged
- High press cut-off switch
- Low pressure switch
- A/C clutch coil
- A/C compressor clutch ground circuit open
- (C3) A/C clutch relay output circuit open
- Fused B+ circuit open
- A/C clutch relay