- With the engine switch on (IG), a voltage of 4.7 V or higher, or 0.3 V or less at the front height control sensor RH is detected for 1 second.
- When there is a height control sensor power supply voltage malfunction.
- When the height control sensor is determined to be stuck (When the sensor output is constant while the vehicle is turning, the sensor is determined to be stuck).
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Suspension | Section: Suspension Control System | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001CTY006X |
| Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: DESCRIPTION (2008 LX570) | ||
|
DTC |
C1711 |
Front Height Control Sensor RH Circuit Malfunction |
|
DTC |
C1712 |
Front Height Control Sensor LH Circuit Malfunction |
|
DTC |
C1713 |
Rear Height Control Sensor RH Circuit Malfunction |
|
DTC |
C1714 |
Rear Height Control Sensor LH Circuit Malfunction |
DESCRIPTION
The height control sensor changes its resistance value based on changes in vehicle height. The suspension control ECU outputs a fixed voltage of 5 V to the SHB terminal of the height control sensor. If the sensor resistance value changes, the sensor voltage value changes accordingly. The suspension control ECU then receives the voltage value from the sensor to detect the vehicle height change.
|
DTC Code |
Detection Condition |
Trouble Area |
|---|---|---|
|
C1711 |
When one of the following conditions is met: |
|
|
C1712 |
When one of the following conditions is met:
|
|
|
C1713 |
When one of the following conditions is met:
|
|
|
C1714 |
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 (HEIGHT CONTROL SENSOR - SUSPENSION CONTROL ECU) |
NOTICE:
When inspecting the wire harnesses between the suspension control ECU and each sensor, it is difficult to determine the malfunctioning area if there is a sensor power supply malfunction. Therefore, disconnect each sensor connector (front RH, front LH, rear RH and rear LH) on the ECU side.
(a) Check the front height control sensor RH side: (C1711)
(1) Disconnect the K31 and K32 ECU connectors.
(2) Disconnect the z43 sensor connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z43-1 (SHG) - K31-12 (SHG1) |
Always |
Below 1 Ω |
|
z43-2 (SHFR) - K32-26 (SHFR) |
Always |
Below 1 Ω |
|
z43-3 (SHB) - K31-15 (SHB1) |
Always |
Below 1 Ω |
|
z43-1 (SHG) - Body ground |
Always |
10 kΩ or higher |
|
z43-2 (SHFR) - Body ground |
Always |
10 kΩ or higher |
|
z43-3 (SHB) - Body ground |
Always |
10 kΩ or higher |
(b) Check the front height control sensor LH side: (C1712)
(1) Disconnect the K31 and K32 ECU connectors.
(2) Disconnect the z44 sensor connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z44-1 (SHG) - K32-15 (SHG2) |
Always |
Below 1 Ω |
|
z44-2 (SHFL) - K31-21 (SHFL) |
Always |
Below 1 Ω |
|
z44-3 (SHB) - K32-14 (SHB2) |
Always |
Below 1 Ω |
|
z44-1 (SHG) - Body ground |
Always |
10 kΩ or higher |
|
z44-2 (SHFL) - Body ground |
Always |
10 kΩ or higher |
|
z44-3 (SHB) - Body ground |
Always |
10 kΩ or higher |
(c) Check the rear height control sensor RH side: (C1713)
(1) Disconnect the K31 and K32 ECU connectors.
(2) Disconnect the N4 sensor connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
N4-3 (SHG) - K32-20 (SHG3) |
Always |
Below 1 Ω |
|
N4-2 (SHRR) - K32-24 (SHRR) |
Always |
Below 1 Ω |
|
N4-1 (SHB) - K32-13 (SHB3) |
Always |
Below 1 Ω |
|
N4-3 (SHG) - Body ground |
Always |
10 kΩ or higher |
|
N4-2 (SHRR) - Body ground |
Always |
10 kΩ or higher |
|
N4-1 (SHB) - Body ground |
Always |
10 kΩ or higher |
(d) Check the rear height control sensor LH side: (C1714)
(1) Disconnect the K31 and K32 ECU connectors.
(2) Disconnect the N6 sensor connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
N6-3 (SHG) - K32-19 (SHG4) |
Always |
Below 1 Ω |
|
N6-2 (SHRL) - K32-27 (SHRL) |
Always |
Below 1 Ω |
|
N6-1 (SHB) - K32-25 (SHB4) |
Always |
Below 1 Ω |
|
N6-3 (SHG) - Body ground |
Always |
10 kΩ or higher |
|
N6-2 (SHRL) - Body ground |
Always |
10 kΩ or higher |
|
N6-1 (SHB) - Body ground |
Always |
10 kΩ or higher |
|
|
2. |
INSPECT HEIGHT CONTROL SENSOR |
(a) Check the front height control sensor:
(1) Remove the front height control sensor RH or front height control sensor LH
.
NOTICE:
Do not drop the height control sensor. If it is dropped, replace it with a new one.
(2) Connect 3 1.5 V dry cell batteries in series.
(3) Connect the positive (+) end of the batteries to terminal 3 (SHB) of the height control sensor and the negative (-) end of the batteries to terminal 1 (SHG). While slowly moving the sensor link up and down, measure the voltage between terminal 2 (SHFR*1 or SHFL*2) and terminal 1 (SHG).
NOTICE:
Do not apply a voltage of higher than 6 V.
HINT:
*1: for RH
*2: for LH
(4) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (SHFR) - 1 (SHG) |
Max. HI |
Approx. 4.1 V |
|
Normal |
Approx. 2.25 V |
|
|
Min. LO |
Approx. 0.45 V |
for LH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (SHFL) - 1 (SHG) |
Max. HI |
Approx. 4.1 V |
|
Normal |
Approx. 2.25 V |
|
|
Min. LO |
Approx. 0.45 V |
(b) Check the rear height control sensor.
(1) Remove the rear height control sensor RH or rear height control sensor LH
.
NOTICE:
Do not drop the height control sensor. If it is dropped, replace it with a new one.
(2) Connect 3 1.5 V dry cell batteries in series.
(3) Connect the positive (+) end of the batteries to terminal 1 (SHB) of the height control sensor and the negative (-) end of the batteries to terminal 3 (SHG). While slowly moving the sensor link up and down, measure the voltage between terminal 2 (SHRR*1 or SHRL*2) and terminal 3 (SHG).
NOTICE:
Do not apply a voltage of higher than 6 V.
HINT:
*1: for RH
*2: for LH
(4) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (SHRR) - 3 (SHG) |
Max. HI |
Approx. 4.1 V |
|
Normal |
Approx. 2.25 V |
|
|
Min. LO |
Approx. 0.45 V |
for LH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (SHRL) - 3 (SHG) |
Max. HI |
Approx. 4.1 V |
|
Normal |
Approx. 2.25 V |
|
|
Min. LO |
Approx. 0.45 V |
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
Front height control sensor RH malfunction |
B |
|
Front height control sensor LH malfunction |
C |
|
Rear height control sensor RH malfunction |
D |
|
Rear height control sensor LH malfunction |
E |
|
|
|