P1599

Tests 1 - 3:

Tests 4 - 8:

SYMPTOM
P1599 - A/C PRESSURE SENSOR VOLTAGE TOO LOW

WHEN MONITORED
With the ignition ON, the engine running, and the A/C relay energized.

SET CONDITION
The A/C pressure sensor signal voltage at PCM cavity 42 goes below 0.5 volt, or the voltage is below 0.7 volt for 22 seconds when the A/C relay is energized.

POSSIBLE CAUSES
- A/C pressure sensor 5 volt supply circuit open
- A/C pressure sensor harness observable damage
- A/C pressure sensor harness intermittent damage
- A/C pressure sensor signal circuit shorted to sensor ground circuit
- A/C pressure sensor signal circuit shorted to ground
- A/C pressure sensor defective
- PCM defective