Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - SUSPENSION CONTROL
CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - SUSPENSION CONTROL ECU)
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: 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 a pressure of 1 MPa (10.2 kgf/cm2, 145 psi) or more is placed on the pressure sensor for 20 seconds or more, no voltage is flowing to the height control pump and motor, and the vehicle height control is not operating, it is determined that there is a sensor stuck malfunction. | Harness or connector Height control pump and motor (Pressure sensor) Suspension control ECU |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
| 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.
Disconnect the i2 pressure sensor connector.
Disconnect the K34 and K35 ECU connectors.
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
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| OK | |
| 2.CHECK SUSPENSION CONTROL ECU |
Connect the K34 and K35 suspension control ECU connectors.
Disconnect the i2 pressure sensor connector.
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
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| OK | |
| 3.CHECK PRESSURE SENSOR |
Connect the K34 and K35 suspension control ECU connectors.
Connect the i2 pressure sensor connector.
Start the engine and push the up button of the height control switch to activate height control.
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
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| OK | ||
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