P1599

Test 1 - 2:

Test 3 - 7:

Test 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