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DTC P1599: A/C Pressure Sensor Volts Too Low

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: A/C pressure sensor may also be referred to as A/C pressure transducer. A/C pressure sensor voltage is monitored with ignition on, engine is running and A/C clutch relay is energized. DTC may be stored in Powertrain Control Module (PCM) if A/C pressure sensor signal at PCM is less than .59 volt. Possible causes are: defective A/C pressure sensor, defective PCM, or defective connectors or wiring.
  1. Turn ignition on with engine off. Using scan tool, read A/C pressure sensor voltage. If A/C pressure sensor voltage is less than .2 volts, go to next step. If A/C pressure sensor voltage is .2 volt or more, go to step  8 .
  2. Turn ignition off. Disconnect A/C pressure sensor connector. A/C pressure sensor is located on A/C refrigerant line on firewall, near front of generator. See Figure .
  3. Turn ignition on with engine off. Using voltmeter, check voltage at terminal No. 2 (Violet/White wire) on A/C pressure sensor connector. If voltage is more than 4.9 volts, go to next step. If voltage is 4.9 volts or less, repair open on Violet/White wire between PCM and A/C pressure sensor. PCM is located between driver's side front fender and power distribution center, near battery. Perform TEST VER-2A  .
  4. Ensure ignition is on with engine off. Using scan tool, read A/C pressure sensor voltage with A/C pressure sensor connector disconnected. If A/C pressure sensor voltage is 4.5 volts or less, go to next step. If A/C pressure sensor voltage is more than 4.5 volts, replace A/C pressure sensor. Perform TEST VER-2A  .
  5. Turn ignition off. Disconnect PCM connectors. PCM is located between driver's side front fender and power distribution center, near battery.
  6. Ensure A/C pressure sensor connector is still disconnect. Using ohmmeter, check resistance between terminals No. 1 (Black/Light Blue wire) and No. 3 (Dark Blue wire) on A/C pressure sensor connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair Dark Blue wire and Black/Light Blue wire between A/C pressure sensor to PCM as they are shorted together. Perform TEST VER-2A  .
  7. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and terminal No. 3 (Dark Blue) wire on A/C pressure sensor connector. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-2A  . If resistance is less than 5 ohms, repair short to ground on Dark Blue wire between PCM and A/C pressure sensor. Perform TEST VER-2A  .
  8. Turn ignition off. Inspect wiring harness and connectors between A/C pressure sensor and PCM. A/C pressure sensor is located on A/C refrigerant line on firewall, near front of generator. See Figure . PCM is located between driver's side front fender and power distribution center, near battery. If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-2A  .
  9. Turn ignition on with engine off. Using scan tool, read A/C pressure sensor voltage while wiggling wiring harness and connectors between A/C pressure sensor and PCM. If A/C pressure sensor voltage does not change while wiggling wiring harness and connectors, test is complete. If A/C pressure sensor voltage changes while wiggling wiring harness and connectors, repair wiring or connectors as necessary. Perform TEST VER-2A  .
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