Dtc C1731 Front Damping Force Control Actuator Rh Circuit Malfunction

Suspension. Land Cruiser. Urj200, 202 Grj200 Vdj200
Suspension Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DAMPER STEP)

RECONFIRM DTC OUTPUT

CHECK HARNESS AND CONNECTOR (DAMPING FORCE CONTROL ACTUATOR - SUSPENSION CONTROL ECU)

INSPECT DAMPING FORCE CONTROL ACTUATOR

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:
  1. An actuator open-circuit signal is detected for at least 1 second when the actuator operates.
  2. An actuator short-circuit signal is consecutively detected 8 times when the actuator operates.
  1. Harness or connector
  2. Front shock absorber control valve RH (Front damping force control actuator RH)
  3. Suspension control ECU
C1732
When either of the following is detected:
  1. An actuator open-circuit signal is detected for at least 1 second when the actuator operates.
  2. An actuator short-circuit signal is consecutively detected 8 times when the actuator operates.
  1. Harness or connector
  2. Front shock absorber control valve LH (Front damping force control actuator LH)
  3. Suspension control ECU
C1733
When either of the following is detected:
  1. An actuator open-circuit signal is detected for at least 1 second when the actuator operates.
  2. An actuator short-circuit signal is consecutively detected 8 times when the actuator operates.
  1. Harness or connector
  2. Rear shock absorber control valve RH (Rear damping force control actuator RH)
  3. Suspension control ECU
C1734
When either of the following is detected:
  1. An actuator open-circuit signal is detected for at least 1 second when the actuator operates.
  2. An actuator short-circuit signal is consecutively detected 8 times when the actuator operates.
  1. Harness or connector
  2. Rear shock absorber control valve LH (Rear damping force control actuator LH)
  3. Suspension control ECU

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1731 Front Damping Force Control Actuator Rh Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. Before performing troubleshooting, inspect the connectors of related circuits.
  2. If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed (Click here).
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DAMPER STEP)

  1. According to the display on the intelligent tester, perform the Active Test.

  1. 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.


NG
Go to step 3
OK


2.RECONFIRM DTC OUTPUT

  1. Clear the DTCs (Click here).

  1. Perform a road test.

  1. Check for DTCs.

    Result
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B


B
USE SIMULATION METHOD TO CHECK (Click here)
A


3.CHECK HARNESS AND CONNECTOR (DAMPING FORCE CONTROL ACTUATOR - SUSPENSION CONTROL ECU)


  1. Check the front side damping force control actuator.

    1. Disconnect the N9 and/or N11 actuator connector.



    2. Disconnect the K36 ECU connector.


      Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1731 Front Damping Force Control Actuator Rh Circuit Malfunction

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      for RH (C1731)
      Tester Connection
      		Condition
      		Specified Condition
      K36-5 (FAR-) - N9-4 (FAR-)
      		Always
      		Below 1 Ω
      K36-5 (FAR-) - Body ground
      		Always
      		10 kΩ or higher
      K36-6 (FAR+) - N9-1 (FAR+)
      		Always
      		Below 1 Ω
      K36-6 (FAR+) - Body ground
      		Always
      		10 kΩ or higher
      K36-17 (FBR-) - N9-3 (FBR-)
      		Always
      		Below 1 Ω
      K36-17 (FBR-) - Body ground
      		Always
      		10 kΩ or higher
      K36-18 (FBR+) - N9-5 (FBR+)
      		Always
      		Below 1 Ω
      K36-18 (FBR+) - Body ground
      		Always
      		10 kΩ or higher
      N9-2 (E FR) - Body ground
      		Always
      		Below 1 Ω
      for LH (C1732)
      Tester Connection
      		Condition
      		Specified Condition
      K36-2 (FBL+) - N11-5 (FBL+)
      		Always
      		Below 1 Ω
      K36-2 (FBL+) - Body ground
      		Always
      		10 kΩ or higher
      K36-3 (FAL-) - N11-4 (FAL-)
      		Always
      		Below 1 Ω
      K36-3 (FAL-) - Body ground
      		Always
      		10 kΩ or higher
      K36-4 (FAL+) - N11-1 (FAL+)
      		Always
      		Below 1 Ω
      K36-4 (FAL+) - Body ground
      		Always
      		10 kΩ or higher
      K36-12 (FBL-) - N11-3 (FBL-)
      		Always
      		Below 1 Ω
      K36-12 (FBL-) - Body ground
      		Always
      		10 kΩ or higher
      N11-2 (E FL) - Body ground
      		Always
      		Below 1 Ω


  1. Check the rear side damping force control actuator.

    1. Disconnect the N6 and/or N8 actuator connector.



    2. Disconnect the K35 ECU connector.


      Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1731 Front Damping Force Control Actuator Rh Circuit Malfunction

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      for RH (C1733)
      Tester Connection
      		Condition
      		Specified Condition
      K35-4 (RBR-) - N6-3 (RBR-)
      		Always
      		Below 1 Ω
      K35-4 (RBR-) - Body ground
      		Always
      		10 kΩ or higher
      K35-5 (RAR+) - N6-1 (RAR+)
      		Always
      		Below 1 Ω
      K35-5 (RAR+) - Body ground
      		Always
      		10 kΩ or higher
      K35-13 (RBR+) - N6-5 (RBR+)
      		Always
      		Below 1 Ω
      K35-13 (RBR+) - Body ground
      		Always
      		10 kΩ or higher
      K35-14 (RAR-) - N6-4 (RAR-)
      		Always
      		Below 1 Ω
      K35-14 (RAR-) - Body ground
      		Always
      		10 kΩ or higher
      N6-2 (E RR) - Body ground
      		Always
      		Below 1 Ω
      for LH (C1734)
      Tester Connection
      		Condition
      		Specified Condition
      K35-2 (RAL-) - N8-4 (RAL-)
      		Always
      		Below 1 Ω
      K35-2 (RAL-) - Body ground
      		Always
      		10 kΩ or higher
      K35-3 (RAL+) - N8-1 (RAL+)
      		Always
      		Below 1 Ω
      K35-3 (RAL+) - Body ground
      		Always
      		10 kΩ or higher
      K35-7 (RBL-) - N8-3 (RBL-)
      		Always
      		Below 1 Ω
      K35-7 (RBL-) - Body ground
      		Always
      		10 kΩ or higher
      K35-8 (RBL+) - N8-5 (RBL+)
      		Always
      		Below 1 Ω
      K35-8 (RBL+) - Body ground
      		Always
      		10 kΩ or higher
      N8-2 (E RL) - Body ground
      		Always
      		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT DAMPING FORCE CONTROL ACTUATOR


  1. Check the front side damping force control actuator.

    1. Connect the N9 and/or N11 front absorber control actuator connector.



      2. Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1731 Front Damping Force Control Actuator Rh Circuit Malfunction

    2. Disconnect the K36 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
      K36-5 (FAR-) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K36-6 (FAR+) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K36-17 (FBR-) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K36-18 (FBR+) - Body ground
      		Always
      		12.0 to 13.6 Ω
      for LH (C1732)
      Tester Connection
      		Condition
      		Specified Condition
      K36-2 (FBL+) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K36-3 (FAL-) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K36-4 (FAL+) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K36-12 (FBL-) - Body ground
      		Always
      		12.0 to 13.6 Ω


  1. Check the rear side damping force control actuator.

    1. Connect the N6 and/or N8 rear absorber control actuator connector.



      2. Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1731 Front Damping Force Control Actuator Rh Circuit Malfunction

    2. Disconnect the K35 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
      K35-4 (RBR-) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K35-5 (RAR+) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K35-13 (RBR+) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K35-14 (RAR-) - Body ground
      		Always
      		12.0 to 13.6 Ω
      for LH (C1734)
      Tester Connection
      		Condition
      		Specified Condition
      K35-2 (RAL-) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K35-3 (RAL+) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K35-7 (RBL-) - Body ground
      		Always
      		12.0 to 13.6 Ω
      K35-8 (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


B
REPLACE FRONT SHOCK ABSORBER CONTROL VALVE RH (Click here)

C
REPLACE FRONT SHOCK ABSORBER CONTROL VALVE LH (Click here)

D
REPLACE REAR SHOCK ABSORBER CONTROL VALVE RH (Click here)

E
REPLACE REAR SHOCK ABSORBER CONTROL VALVE LH (Click here)
A

REPLACE SUSPENSION CONTROL ECU (Click here)