P1599

Tests 649 - 653:

Tests 654 - 656:

SYMPTOM
P-1599 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 press sensor conn & wir harn obser damage
- A/C press sensor conn & wir harness inter damage
- A/C pressure sen sig ckt shorted to sen ground ckt
- A/C pressure sen signal circuit shorted to ground
- A/C pressure sensor defective
- PCM defective