Nissan Maxima Service and Repair Manual: Refrigerant pressure sensor

Description

The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent to ECM, and ECM controls cooling fan system.

Nissan Maxima. Description

Component Function Check

1.CHECK REFRIGERANT PRESSURE SENSOR FUNCTION

Nissan Maxima. CHECK REFRIGERANT PRESSURE SENSOR FUNCTION

  1. Start engine and warm it up to normal operating temperature.
  2. Turn A/C switch and blower fan switch ON.
  3. Check the voltage between ECM harness connector terminals under the following conditions.

Nissan Maxima. CHECK REFRIGERANT PRESSURE SENSOR FUNCTION

Diagnosis Procedure

1.CHECK GROUND CONNECTION

  1. Turn A/C switch and blower fan switch OFF.
  2. Stop engine.
  3. Turn ignition switch OFF.
  4. Check ground connection E9.

2.CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

Nissan Maxima. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

  1. Disconnect refrigerant pressure sensor harness connector.
  2. Turn ignition switch ON.
  3. Check the voltage between refrigerant pressure sensor harness connector and ground.

Nissan Maxima. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

3.DETECT MALFUNCTIONING PART

Check the following.

  • Harness connectors E3, F1
  • Junction block connectors E44, E45
  • IPDM E/R harness connectors E18, E201
  • Harness for open or short between ECM and refrigerant pressure sensor

4.CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
  4. Also check harness for short to ground and short to power.

Nissan Maxima. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

5.DETECT MALFUNCTIONING PART

Check the following.

  • Harness connectors E3, F1
  • IPDM E/R harness connectors E18, E201
  • Harness for open or short between ECM and refrigerant pressure sensor

6.CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

  1. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
  2. Also check harness for short to ground and short to power.

Nissan Maxima. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

7.DETECT MALFUNCTIONING PART

Check the following.

  • Harness connectors E3, F1
  • IPDM E/R harness connectors E18, E201
  • Harness for open or short between ECM and refrigerant pressure sensor

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