- An actuator open-circuit signal is detected for at least 1 second when the actuator operates.
- An actuator short-circuit signal is consecutively detected 8 times when the actuator operates.
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Suspension | Section: Suspension Control System | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001CU6006X |
| Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: DESCRIPTION (2008 LX570) | ||
|
DTC |
C1731 |
Front Damping Force Control Actuator RH Circuit Malfunction |
|
DTC |
C1732 |
Front Damping Force Control Actuator LH Circuit Malfunction |
|
DTC |
C1733 |
Rear Damping Force Control Actuator RH Circuit Malfunction |
|
DTC |
C1734 |
Rear Damping Force Control Actuator LH Circuit Malfunction |
DESCRIPTION
The ECU sends a signal to the damping force control actuator to drive the rotary valve of the shock absorber changing the shock absorber damping force.
The actuator is driven electromagnetically by a step motor so that it can accurately follow the driving conditions that change frequently.
|
DTC Code |
Detection Condition |
Trouble Area |
|---|---|---|
|
C1731 |
When either of the following is detected: |
|
|
C1732 |
When either of the following is detected:
|
|
|
C1733 |
When either of the following is detected:
|
|
|
C1734 |
When either of the following is detected:
|
|
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. |
PERFORM ACTIVE TEST USING TECHSTREAM (DAMPER STEP) |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Start the engine and turn the Techstream on.
(d) Enter the following menus: Chassis / AHC / Active Test.
(e) Check if the damping force control actuator operates in accordance with the Active Test.
AHC
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Damper Step FR |
Changes front damper RH step |
min.: 1 step max.: 16 step |
The Damper Step item of the Data List changes to the step selected in the Active Test. |
|
Damper Step FL |
Changes front damper LH step |
min.: 1 step max.: 16 step |
The Damper Step item of the Data List changes to the step selected in the Active Test. |
|
Damper Step RR |
Changes rear damper RH step |
min.: 1 step max.: 16 step |
The Damper Step item of the Data List changes to the step selected in the Active Test. |
|
Damper Step RL |
Changes rear damper LH step |
min.: 1 step max.: 16 step |
The Damper Step item of the Data List changes to the step selected in the Active Test. |
OK:
The damping force control actuator operates.
|
|
2. |
RECONFIRM DTC OUTPUT |
(a) Clear the DTCs
.
(b) Perform a road test.
(c) Check for DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC is output |
A |
|
DTC is not output |
B |
|
|
3. |
CHECK HARNESS AND CONNECTOR (DAMPING FORCE CONTROL ACTUATOR - SUSPENSION CONTROL ECU) |
(a) Check the front side damping force control actuator.
(1) Disconnect the N8 and/or N10 actuator connector.
(2) Disconnect the K32 ECU connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH (C1731)
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K32-5 (FAR-) - N8-4 (FAR-) |
Always |
Below 1 Ω |
|
K32-5 (FAR-) - Body ground |
Always |
10 kΩ or higher |
|
K32-6 (FAR+) - N8-1 (FAR+) |
Always |
Below 1 Ω |
|
K32-6 (FAR+) - Body ground |
Always |
10 kΩ or higher |
|
K32-17 (FBR-) - N8-3 (FBR-) |
Always |
Below 1 Ω |
|
K32-17 (FBR-) - Body ground |
Always |
10 kΩ or higher |
|
K32-18 (FBR+) - N8-5 (FBR+) |
Always |
Below 1 Ω |
|
K32-18 (FBR+) - Body ground |
Always |
10 kΩ or higher |
|
N8-2 (E FR) - Body ground |
Always |
Below 1 Ω |
for LH (C1732)
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K32-2 (FBL+) - N10-5 (FBL+) |
Always |
Below 1 Ω |
|
K32-2 (FBL+) - Body ground |
Always |
10 kΩ or higher |
|
K32-3 (FAL-) - N10-4 (FAL-) |
Always |
Below 1 Ω |
|
K32-3 (FAL-) - Body ground |
Always |
10 kΩ or higher |
|
K32-4 (FAL+) - N10-1 (FAL+) |
Always |
Below 1 Ω |
|
K32-4 (FAL+) - Body ground |
Always |
10 kΩ or higher |
|
K32-12 (FBL-) - N10-3 (FBL-) |
Always |
Below 1 Ω |
|
K32-12 (FBL-) - Body ground |
Always |
10 kΩ or higher |
|
N10-2 (E FL) - Body ground |
Always |
Below 1 Ω |
(b) Check the rear side damping force control actuator.
(1) Disconnect the N5 and/or N7 actuator connector.
(2) Disconnect the K31 ECU connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH (C1733)
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K31-4 (RBR-) - N5-3 (RBR-) |
Always |
Below 1 Ω |
|
K31-4 (RBR-) - Body ground |
Always |
10 kΩ or higher |
|
K31-5 (RAR+) - N5-1 (RAR+) |
Always |
Below 1 Ω |
|
K31-5 (RAR+) - Body ground |
Always |
10 kΩ or higher |
|
K31-13 (RBR+) - N5-5 (RBR+) |
Always |
Below 1 Ω |
|
K31-13 (RBR+) - Body ground |
Always |
10 kΩ or higher |
|
K31-14 (RAR-) - N5-4 (RAR-) |
Always |
Below 1 Ω |
|
K31-14 (RAR-) - Body ground |
Always |
10 kΩ or higher |
|
N5-2 (E RR) - Body ground |
Always |
Below 1 Ω |
for LH (C1734)
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K31-2 (RAL-) - N7-4 (RAL-) |
Always |
Below 1 Ω |
|
K31-2 (RAL-) - Body ground |
Always |
10 kΩ or higher |
|
K31-3 (RAL+) - N7-1 (RAL+) |
Always |
Below 1 Ω |
|
K31-3 (RAL+) - Body ground |
Always |
10 kΩ or higher |
|
K31-7 (RBL-) - N7-3 (RBL-) |
Always |
Below 1 Ω |
|
K31-7 (RBL-) - Body ground |
Always |
10 kΩ or higher |
|
K31-8 (RBL+) - N7-5 (RBL+) |
Always |
Below 1 Ω |
|
K31-8 (RBL+) - Body ground |
Always |
10 kΩ or higher |
|
N7-2 (E RL) - Body ground |
Always |
Below 1 Ω |
|
|
4. |
INSPECT DAMPING FORCE CONTROL ACTUATOR |
(a) Check the front side damping force control actuator.
(1) Connect the N8 and/or N10 front absorber control actuator connector.
|
(2) Disconnect the K32 ECU connector. |
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH (C1731)
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K32-5 (FAR-) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K32-6 (FAR+) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K32-17 (FBR-) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K32-18 (FBR+) - Body ground |
Always |
12.0 to 13.6 Ω |
for LH (C1732)
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K32-2 (FBL+) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K32-3 (FAL-) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K32-4 (FAL+) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K32-12 (FBL-) - Body ground |
Always |
12.0 to 13.6 Ω |
(b) Check the rear side damping force control actuator.
(1) Connect the N5 and/or N7 rear absorber control actuator connector.
|
(2) Disconnect the K31 ECU connector. |
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH (C1733)
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K31-4 (RBR-) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K31-5 (RAR+) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K31-13 (RBR+) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K31-14 (RAR-) - Body ground |
Always |
12.0 to 13.6 Ω |
for LH (C1734)
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K31-2 (RAL-) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K31-3 (RAL+) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K31-7 (RBL-) - Body ground |
Always |
12.0 to 13.6 Ω |
|
K31-8 (RBL+) - Body ground |
Always |
12.0 to 13.6 Ω |
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
Front damping force control actuator RH malfunction |
B |
|
Front damping force control actuator LH malfunction |
C |
|
Rear damping force control actuator RH malfunction |
D |
|
Rear damping force control actuator LH malfunction |
E |
|
|
|