Nissan Maxima Service and Repair Manual: P0550 PSP sensor

Nissan Maxima Service and Repair Manual / Engine / Engine control system / DTC/circuit diagnosis / P0550 PSP sensor

Description

Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load.

This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve opening angle to increase the engine speed and adjusts the idle speed for the increased load.

DTC Logic

DTC DETECTION LOGIC

NOTE: If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-394, "DTC Logic".

Nissan Maxima. DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.

2.PERFORM DTC CONFIRMATION PROCEDURE

  1. Start engine and let it idle for at least 5 seconds.
  2. Check 1st trip DT

Diagnosis Procedure

1.CHECK GROUND CONNECTION

  1. Turn ignition switch OFF.
  2. Check ground connection E9.

2.CHECK PSP SENSOR POWER SUPPLY CIRCUIT

Nissan Maxima. CHECK PSP SENSOR POWER SUPPLY CIRCUIT

  1. Disconnect power steering pressure (PSP) sensor harness connector.
  2. Turn ignition switch ON.
  3. Check the voltage between PSP sensor harness connector and ground.

Nissan Maxima. CHECK PSP SENSOR POWER SUPPLY CIRCUIT

3.CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

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

Nissan Maxima. CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

4.CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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

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

5.CHECK PSP SENSOR

6.CHECK INTERMITTENT INCIDENT

Component Inspection

1.CHECK POWER STEERING PRESSURE SENSOR

Nissan Maxima. CHECK POWER STEERING PRESSURE SENSOR

  1. Reconnect all harness connectors disconnected.
  2. Start engine and let it idle.
  3. Check the voltage between ECM terminals under the following conditions.

Nissan Maxima. .CHECK POWER STEERING PRESSURE SENSOR

    P050A, P050e cold start control
    Description ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition. This control promotes the activation of three way catalyst by heating the c ...

    P0603 ECM power supply
    Description Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value me ...

    Other materials:

    P0462, P0463 fuel level sensor
    Description The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter sends the fuel level sensor signal to the ECM via the CAN communication line. It consists o ...

    Automatic speed control device (ASCD)
    System Diagram System Description INPUT/OUTPUT SIGNAL CHART *: This signal is sent to the ECM via the CAN communication line BASIC ASCD SYSTEM Refer to Owner's Manual for ASCD operating instructions. Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predeterm ...

    Diagnosis system (audio unit)
    Diagnosis Description Self-diagnosis mode can perform the following items. Versions display Channel check diagnosis Key check diagnosis AV communication diagnosis VERSIONS DISPLAY FUNCTION Turn ignition switch ON. Turn the audio unit off. While pressing "1" button, turn vol ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2026 Copyright www.nimainfo.com
    0.0067