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DTC P1598: A/C Pressure Sensor Volts Too High: Testing

NOTE: A/C pressure sensor may also be referred to as A/C pressure transducer.
  1. Turn ignition on. Using scan tool, read A/C pressure sensor voltage. If A/C pressure sensor voltage is more than 4.6 volts, go to next step. If A/C pressure sensor voltage is 4.6 volts or less, go to step  7.
  2. Turn ignition off. Disconnect A/C pressure sensor Gray connector. A/C pressure sensor is located in high pressure line, near A/C compressor. Disconnect Powertrain Control Module (PCM) connector. 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 of Black/Light Blue wire between A/C pressure sensor harness connector and terminal No. 43 at PCM C2 harness connector. See Figure. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
  3. Ensure ignition is off. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and Dark Blue wire at A/C pressure sensor harness connector. If voltage is 5.5 volts or less, go to next step. If voltage is more than 5.5 volts, repair short to voltage in Dark Blue wire between A/C pressure sensor and PCM.
  4. Using scan tool, read A/C pressure sensor voltage. Connect a jumper wire between Black/Light Blue wire and Dark Blue wire at A/C pressure sensor harness connector and observe voltage reading. If voltage is one volt or more, disconnect jumper wire and go to next step. If voltage is less than one volt, replace A/C pressure sensor.
  5. Turn ignition off. Disconnect PCM connectors. Measure resistance of Dark Blue wire between A/C pressure sensor harness connector and terminal No. 42 at PCM C2 harness connector. See Figure. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue wire.
  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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