ACTIVE HEIGHT CONTROL SUSPENSION, Diagnostic DTC:C1718

DTC Code DTC Name
C1718 Pressure Sensor Circuit Malfunction

DESCRIPTION

This circuit is used for sending the data to detect the pressure output from the pump. The abnormality of the fluid pressure is judged by the ECU.

DTC Code Detecting Condition Trouble Area
C1718

When one of the following conditions is met:


  • When detecting an abnormal signal from the pressure sensor (pressure sensor terminal voltage of ECU is 0.3 V or less or 4.6 V or more) for 1 second.

  • When there is a pressure sensor power supply voltage malfunction.

  • When the pump motor is not operating and a pressure of 1 MPa (10.2 kgf/cm2, 145 psi) or more is placed on the pressure sensor for 20 seconds or more.

  • Harness or connector

  • Height control pump and motor (Pressure sensor)

  • Suspension control ECU

WIRING DIAGRAM

A01WS24E03
*a SPB
*b SPG
*c Pressure Sensor
*d Suspension Control ECU

CAUTION / NOTICE / HINT

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - SUSPENSION CONTROL ECU)

    Note

    When inspecting the wire harness between the suspension control ECU and pressure sensor, it is difficult to determine the malfunctioning area if there is a sensor power supply malfunction. Therefore, disconnect the connectors for the pressure sensor, the acceleration sensors (front RH, front LH) and fluid temperature sensor on the ECU side.


    1. Disconnect the e2 pressure sensor connector.

    2. Disconnect the K30 and K31 ECU connectors.

      A01WPLZE03
      *1 Rear view of wire harness connector: (to Suspension Control ECU)
      *2 Front view of wire harness connector: (to Pressure Sensor)
      *3 10 (SPB)
      *4 19 (SPG)

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K31-10 (SPB) - e2-1 (SHB) Always Below 1 Ω
      K31-19 (SPG) - e2-3 (SHG) Always Below 1 Ω
      K31-20 (PACC) - e2-2 (PACC) Always Below 1 Ω
      K31-10 (SPB) - Body ground Always 10 kΩ or higher
      K31-19 (SPG) - Body ground Always 10 kΩ or higher
      K31-20 (PACC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK SUSPENSION CONTROL ECU


    1. Connect the K30 and K31 suspension control ECU connectors.

    2. A01WVUTE02
      *1 Front view of wire harness connector: (to Pressure Sensor)

      Disconnect the e2 pressure sensor connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      e2-1 (SHB) - e2-3 (SHG) Engine switch on (IG) 4.75 to 5.25 V

    NG

    REPLACE SUSPENSION CONTROL ECU Click here

    OK

  3. CHECK PRESSURE SENSOR


    1. Connect the K30 and K31 suspension control ECU connectors.

    2. Connect the e2 pressure sensor connector.

    3. A01WU6AE02
      *1 Component with harness connected: (Suspension Control ECU)
      *2 19 (SPG)

      Start the engine and push the up button of the height control switch to activate height control.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      K31-20 (PACC) - K31-19 (SPG) While height control is operating. 1.48 to 2.54 V

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPLACE HEIGHT CONTROL PUMP AND MOTOR