Checking A/C System Operation With No DTC's

Tests 1 - 4:

Tests 5 - 9:

Tests 10 - 11:

SYMPTOM
CHECKING A/C SYSTEM OPERATION WITH NO DTCS

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