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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. 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 more than 4.6 volts, go to next step. If A/C pressure sensor voltage is 4.6 volts or less, go to step  8 .
  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 PCM harness connector. See Figure . Measure resistance between signal circuit (Dark Blue wire) 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 between signal circuit and 5-volt supply circuit between A/C pressure sensor and PCM.
  3. Ensure ignition is off. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and signal circuit (Dark Blue wire) at A/C pressure sensor harness connector. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Dark Blue wire between A/C pressure sensor and PCM.
  4. Turn ignition off. Connect a jumper wire between signal circuit (Dark Blue wire) and sensor ground circuit (Black/Light Blue wire) at A/C pressure sensor harness connector. Turn ignition on. Using scan tool, read A/C pressure sensor voltage. 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 harness connectors. Measure resistance of signal circuit (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. Reconnect PCM harness connectors. Measure resistance between ground and sensor ground circuit (Black/Light Blue wire) at A/C pressure sensor harness connector. If resistance is less than 30 ohms, go to next step. If resistance is 30 ohms or more, repair open in sensor ground circuit.
  7. If no other possible causes are remaining, replace PCM.
  8. 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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