C1731
SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1731-C1734: Front Damping Force Control Actuator RH 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.
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 Programming and Relearning.
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
OK:
The damping force control actuator operates.
NG -- CHECK HARNESS AND CONNECTOR (DAMPING FORCE CONTROL ACTUATOR - SUSPENSION CONTROL ECU)
OK -- Continue to next step.
2. RECONFIRM DTC OUTPUT
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Perform a road test.
(c) Check for DTCs.
Result
B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.
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)
for LH (C1732)
(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)
for LH (C1734)
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
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)
for LH (C1732)
(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)
for LH (C1734)
Result
E -- REPLACE REAR SHOCK ABSORBER CONTROL VALVE LH Removal
D -- REPLACE REAR SHOCK ABSORBER CONTROL VALVE RH Removal
C -- REPLACE FRONT SHOCK ABSORBER CONTROL VALVE LH Removal
B -- REPLACE FRONT SHOCK ABSORBER CONTROL VALVE RH Removal
A -- REPLACE SUSPENSION CONTROL ECU Removal