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

  1. Using scan tool, read A/C pressure sensor voltage. If A/C pressure sensor voltage is less than .2 volt, go to next step. If A/C pressure sensor voltage is .2 volt or more, go to  7.
  2. Disconnect A/C pressure sensor connector. A/C pressure sensor is located in high pressure line, near A/C compressor. Using scan tool, read A/C pressure sensor voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace A/C pressure sensor.
  3. Measure voltage between ground and Violet/White wire at A/C pressure sensor harness connector. If voltage is 4.9 volts or more, go to next step. If voltage is less than 4.9 volts, repair open in Violet/White wire between A/C pressure sensor and PCM.
  4. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). See Figure. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance between ground and Dark Blue 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 Dark Blue wire between A/C pressure sensor and PCM.
  5. Measure resistance between terminals No. 42 (Dark Blue wire) and No. 43 (Black/Light Blue wire) at PCM C2 harness connector. See Figure. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, Dark Blue and Black/Light Blue wires are shorted together. Repair wiring as necessary.
  6. At this time, PCM is assumed to be defective. Replace PCM.
  7. Turn ignition off. Using scan tool, read A/C pressure sensor voltage while wiggling wiring harness and connectors between A/C pressure sensor and PCM. A/C pressure sensor is located in high pressure line, near A/C compressor. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). See Figure. If A/C pressure sensor voltage changes while wiggling wiring harness and connectors, repair connector or wiring harness where wiggling caused display to change. If A/C pressure sensor voltage does not change while wiggling wiring harness and connectors, visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, no problem is indicated at this time. Test is complete. Check for any technical service bulletins that may apply.
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