P1599

Tests 1 - 2:

Tests 3 - 7:

Tests 8 - 10:

SYMPTOM
P1599-A/C PRESSURE SENSOR VOLTS TOO LOW

WHEN MONITORED
Engine running. The A/C relay energized.

SET CONDITION
The A/C pressure sensor signal voltage at the PCM goes below 0.58 volts for 2.6 seconds.

POSSIBLE CAUSES
- Intermittent Condition
- 5 Volt Supply Circuit Shorted To Ground
- 5 Volt Supply Circuit Open
- A/C Pressure Sensor Internal Failure
- A/C Pressure Sensor Signal Circuit Shorted To Ground
- A/C Pressure Sensor Signal Circuit Shorted To Sensor Ground Circuit
- PCM 5 Volt Supply Circuit
- PCM A/C Pressure Sensor Signal