Dtc C1718 Pressure Sensor Circuit Malfunction

Suspension. Land Cruiser. Urj200, 202 Grj200 Vdj200
Suspension Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK SUSPENSION CONTROL ECU

CHECK PRESSURE SENSOR

DTC 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:
  1. 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.
  2. When there is a pressure sensor power supply voltage malfunction.
  3. 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.
  1. Harness or connector
  2. Height control pump and motor (Pressure sensor)
  3. Suspension control ECU

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1718 Pressure Sensor Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. Before performing troubleshooting, inspect the connectors of related circuits.
  2. If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed (Click here).
1.CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - SUSPENSION CONTROL ECU)
NOTICE:
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 i2 pressure sensor connector.



  1. Disconnect the K34 and K35 ECU connectors.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1718 Pressure Sensor Circuit Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K35-10 (SPB) - i2-1 (SHB)
    		Always
    		Below 1 Ω
    K35-19 (SPG) - i2-3 (SHG)
    		Always
    		Below 1 Ω
    K35-20 (PACC) - i2-2 (PACC)
    		Always
    		Below 1 Ω
    K35-10 (SPB) - Body ground
    		Always
    		10 kΩ or higher
    K35-19 (SPG) - Body ground
    		Always
    		10 kΩ or higher
    K35-20 (PACC) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK SUSPENSION CONTROL ECU
Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1718 Pressure Sensor Circuit Malfunction

  1. Connect the K34 and K35 suspension control ECU connectors.

  1. Disconnect the i2 pressure sensor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    i2-1 (SHB) - i2-3 (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 K34 and K35 suspension control ECU connectors.

  1. Connect the i2 pressure sensor connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1718 Pressure Sensor Circuit Malfunction

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

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    K35-20 (PACC) - K35-19 (SPG)
    		While height control is operating.
    		1.48 to 2.54 V


NG
REPLACE HEIGHT CONTROL PUMP AND MOTOR
OK

REPLACE SUSPENSION CONTROL ECU (Click here)