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

  1. Ensure A/C system refrigerant is properly charged. Start engine. Using scan tool, read A/C pressure sensor voltage. If A/C pressure sensor voltage is less than .07 volt, go to next step. If A/C pressure sensor voltage is .07 volt or more, go to step  10 .
  2. Turn ignition off. Disconnect A/C pressure sensor harness connector. A/C pressure sensor is located in high pressure line, near A/C compressor. Turn ignition on. Measure voltage between ground and 5-volt supply circuit (Violet/White 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. Ensure A/C pressure sensor harness connector is disconnected. Using scan tool, read A/C pressure sensor voltage. If voltage is .07 volt or less, go to next step. If voltage is more than .07 volt, replace A/C pressure sensor.
  4. Turn ignition off. Disconnect PCM harness connectors. See Figure . Measure resistance between ground and signal circuit (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 signal circuit (Dark Blue wire) and sensor ground circuit (Black/Light 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 between signal circuit and sensor ground circuit.
  6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
  7. Turn ignition off. Disconnect PCM harness connectors. See Figure . Measure resistance between ground and 5-volt supply circuit (Violet/White 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 5-volt supply circuit.
  8. Measure resistance of 5-volt supply circuit (Violet/White wire) between A/C pressure sensor harness connector and terminal No. 62 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 Violet/White wire.
  9. If no other possible causes are remaining, replace PCM.
  10. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • Ensure A/C system refrigerant is properly charged.
    • With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any technical service bulletins that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

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