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DTC P1599: A/C Pressure Sensor Volts Too Low: Testing

NOTE: Ensure A/C system is properly charged with refrigerant.
  1. Start engine and allow it to idle. Using scan tool, read A/C pressure sensor voltage. If voltage is less than .6 volt, go to next step. If voltage is .6 volt or more, go to step  10.
  2. Turn ignition off. Disconnect A/C pressure sensor connector. A/C pressure sensor is located on A/C refrigerant line between filter-drier and expansion valve in right rear corner of engine compartment. Turn ignition on. Measure voltage between ground and Pink/Yellow wire at A/C pressure sensor harness connector. If voltage is 4.5-5.2 volts, go to next step. If voltage is not 4.5-5.2 volts, go to step  7.
  3. Using scan tool, read A/C pressure sensor voltage. If voltage is .6 volt or less, go to next step. If voltage is more than .6 volt, replace A/C pressure sensor.
  4. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, in front of battery. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance between ground and Light Blue/Brown wire at A/C pressure sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Light Blue/Brown wire between A/C pressure sensor and PCM.
  5. Measure resistance between Light Blue/Brown and Dark Blue/Dark Green wires at A/C pressure sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, Light Blue/Brown and Dark Blue/Dark Green wires are shorted together. Repair wiring as necessary.
  6. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
  7. Turn ignition off. Ensure A/C pressure sensor is disconnected. Disconnect PCM connectors. PCM is located on left side of engine compartment, in front of battery. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance between ground and Pink/Yellow wire at A/C pressure sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Pink/Yellow wire between PCM and A/C pressure sensor.
  8. Measure resistance of Pink/Yellow wire between A/C pressure sensor harness connector and terminal No. 61 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Pink/Yellow wire.
  9. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
  10. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, test is complete.
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