P1599

Tests 1 - 2:

Tests 3 - 7:

Test 8:

SYMPTOM
P1599 - A/C PRESSURE SENSOR VOLTS TOO LOW

WHEN MONITORED
With the ignition switch 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 0.059 volt.

POSSIBLE CAUSES
- A/C pressure sensor 5-volt supply circuit open
- A/C pressure sensor connector and wiring harness observable defect
- A/C pressure sensor signal circuit shorted to sensor ground circuit
- A/C pressure sensor connector and wiring harness intermittent defect
- A/C pressure sensor signal circuit shorted to ground
- A/C pressure sensor defective
- PCM defective (A/C pressure sensor)