- 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.
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Suspension | Section: Suspension Control System | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001CU4006X |
| Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: DESCRIPTION (2008 LX570) | ||
|
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: |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
- 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
.
PROCEDURE
|
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.
(a) Disconnect the e2 pressure sensor connector.
(b) Disconnect the K30 and K31 ECU connectors.
(c) 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 |
|
|
2. |
CHECK SUSPENSION CONTROL ECU |
(a) Connect the K30 and K31 suspension control ECU connectors.
(b) Disconnect the e2 pressure sensor connector.
(c) 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 |
|
|
3. |
CHECK PRESSURE SENSOR |
(a) Connect the K30 and K31 suspension control ECU connectors.
(b) Connect the e2 pressure sensor connector.
|
(c) Start the engine and push the up button of the height control switch to activate height control. |
(d) 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 |
|
|
|