Suspension Control. Dtc C1731/31 Fr Damping Force Control Actuator Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DAMPER STEP)

INSPECT ABSORBER CONTROL ACTUATOR

CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ACTUATOR - SUSPENSION CONTROL ECU)

DTC C1731/31 FR Damping Force Control Actuator Circuit

DTC C1732/32 FL Damping Force Control Actuator Circuit

DTC C1733/33 RR Damping Force Control Actuator Circuit

DTC C1734/34 RL Damping Force Control Actuator Circuit

DESCRIPTION

The absorber control actuator switches the damping force depending on the suspension control ECU signals.

DTC Code	DTC Detection Condition	Trouble Area
C1731/31	Either condition is met: 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.	Harness or connector Front absorber control actuator RH Suspension control ECU
C1732/32	Either condition is met: 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.	Harness or connector Front absorber control actuator LH Suspension control ECU
C1733/33	Either condition is met: 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.	Harness or connector Rear absorber control actuator RH (Rear shock absorber assembly) Suspension control ECU
C1734/34	Either condition is met: 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.	Harness or connector Rear absorber control actuator LH (Rear shock absorber assembly) Suspension control ECU

WIRING DIAGRAM

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System.
Dtc
C1731/31 Fr Damping Force Control Actuator Circuit

INSPECTION PROCEDURE

NOTICE:

When replacing the suspension control ECU, perform registration (LandCruiser RM000003X4500TX.html).

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DAMPER STEP)

Turn the ignition switch off.

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON.

Turn the intelligent tester on.

Enter the following menus: Chassis / Air suspension / Active Test.

Air Suspension
Tester Display	Test Part	Control Range	Diagnostic Note
Damper Step FR	Changes damper step (Front RH)	1 to 17 step	The shock absorber hardens as the damper step increases.
Damper Step FL	Changes damper step (Front LH)	1 to 17 step	The shock absorber hardens as the damper step increases.
Damper Step RR	Changes damper step (Rear RH)	1 to 17 step	The shock absorber hardens as the damper step increases.
Damper Step RL	Changes damper step (Rear LH)	1 to 17 step	The shock absorber hardens as the damper step increases.

OK:: The absorber control actuator operates.

Go to step 2

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

2.INSPECT ABSORBER CONTROL ACTUATOR

Turn the ignition switch off.

Check the front absorber control actuator RH (when DTC C1731/31 is output).
1. Disconnect the A56 actuator connector.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  1 (FAR+) - 2 (FAR-)
  Always
  6.4 to 7.2 Ω
  3 (FBR+) - 4 (FBR-)
  Always
  6.4 to 7.2 Ω
  Text in Illustration
  *a
  Component without harness connected
  (Front Absorber Control Actuator RH)

Text in Illustration
*a	Component without harness connected (Front Absorber Control Actuator RH)

Check the front absorber control actuator LH (when DTC C1732/32 is output).
1. Disconnect the A57 actuator connector.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  1 (FAL+) - 2 (FAL-)
  Always
  6.4 to 7.2 Ω
  3 (FBL+) - 4 (FBL-)
  Always
  6.4 to 7.2 Ω
  Text in Illustration
  *a
  Component without harness connected
  (Front Absorber Control Actuator LH)

Text in Illustration
*a	Component without harness connected (Front Absorber Control Actuator LH)

Check the rear absorber control actuator RH (when DTC C1733/33 is output).
1. Disconnect the S1 actuator connector.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  1 (RAR-) - 2 (RAR+)
  Always
  6.4 to 7.2 Ω
  3 (RBR-) - 4 (RBR+)
  Always
  6.4 to 7.2 Ω
  Text in Illustration
  *a
  Component without harness connected
  (Rear Absorber Control Actuator RH)

Text in Illustration
*a	Component without harness connected (Rear Absorber Control Actuator RH)

Check the rear absorber control actuator LH (when DTC C1734/34 is output).
1. Disconnect the S4 actuator connector.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  1 (RAL-) - 2 (RAL+)
  Always
  6.4 to 7.2 Ω
  3 (RBL-) - 4 (RBL+)
  Always
  6.4 to 7.2 Ω
  Text in Illustration
  *a
  Component without harness connected
  (Rear Absorber Control Actuator LH)
  Result
  Result
  Proceed to
  OK
  A
  NG (Front absorber control actuator RH)
  B
  NG (Front absorber control actuator LH)
  C
  NG (Rear absorber control actuator RH)
  D
  NG (Rear absorber control actuator LH)
  E

Text in Illustration
*a	Component without harness connected (Rear Absorber Control Actuator LH)

Result
Result	Proceed to
OK	A
NG (Front absorber control actuator RH)	B
NG (Front absorber control actuator LH)	C
NG (Rear absorber control actuator RH)	D
NG (Rear absorber control actuator LH)	E

REPLACE FRONT ABSORBER CONTROL ACTUATOR RH (LandCruiser RM000001V4602OX.html)

REPLACE FRONT ABSORBER CONTROL ACTUATOR LH (LandCruiser RM000001V4602OX.html)

REPLACE REAR SHOCK ABSORBER ASSEMBLY RH (LandCruiser RM000002CK5016X.html)

REPLACE REAR SHOCK ABSORBER ASSEMBLY LH (LandCruiser RM000002CK5016X.html)

A

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

Check the front side absorber control actuator.

Disconnect the A56 and/or A57 front absorber control actuator connector.
Disconnect the A14 suspension control ECU connector.

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

Standard Resistance:

for Front RH (for DTC C1731/31)
Tester Connection	Condition	Specified Condition
A56-1 (FAR+) - A14-7 (FAR+)	Always	Below 1 Ω
A56-2 (FAR-) - A14-8 (FAR-)	Always	Below 1 Ω
A56-3 (FBR+) - A14-1 (FBR+)	Always	Below 1 Ω
A56-4 (FBR-) - A14-2 (FBR-)	Always	Below 1 Ω
A56-1 (FAR+) - Body ground	Always	10 kΩ or higher
A56-2 (FAR-) - Body ground	Always	10 kΩ or higher
A56-3 (FBR+) - Body ground	Always	10 kΩ or higher
A56-4 (FBR-) - Body ground	Always	10 kΩ or higher

for Front LH (for DTC C1732/32)
Tester Connection	Condition	Specified Condition
A57-1 (FAL+) - A14-3 (FAL+)	Always	Below 1 Ω
A57-2 (FAL-) - A14-5 (FAL-)	Always	Below 1 Ω
A57-3 (FBL+) - A14-6 (FBL+)	Always	Below 1 Ω
A57-4 (FBL-) - A14-4 (FBL-)	Always	Below 1 Ω
A57-1 (FAL+) - Body ground	Always	10 kΩ or higher
A57-2 (FAL-) - Body ground	Always	10 kΩ or higher
A57-3 (FBL+) - Body ground	Always	10 kΩ or higher
A57-4 (FBL-) - Body ground	Always	10 kΩ or higher

Check the rear side absorber control actuator.

Disconnect the S1 and/or S4 rear absorber control actuator connector.
Disconnect the R19 suspension control ECU connector.

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

Standard Resistance:

for Rear RH (for DTC C1733/33)
Tester Connection	Condition	Specified Condition
S1-1 (RAR-) - R19-2 (RAR-)	Always	Below 1 Ω
S1-2 (RAR+) - R19-1 (RAR+)	Always	Below 1 Ω
S1-3 (RBR-) - R19-4 (RBR-)	Always	Below 1 Ω
S1-4 (RBR+) - R19-3 (RBR+)	Always	Below 1 Ω
S1-1 (RAR-) - Body ground	Always	10 kΩ or higher
S1-2 (RAR+) - Body ground	Always	10 kΩ or higher
S1-3 (RBR-) - Body ground	Always	10 kΩ or higher
S1-4 (RBR+) - Body ground	Always	10 kΩ or higher

for Rear LH (for DTC C1734/34)
Tester Connection	Condition	Specified Condition
S4-1 (RAL-) - R19-6 (RAL-)	Always	Below 1 Ω
S4-2 (RAL+) - R19-5 (RAL+)	Always	Below 1 Ω
S4-3 (RBL-) - R19-8 (RBL-)	Always	Below 1 Ω
S4-4 (RBL+) - R19-7 (RBL+)	Always	Below 1 Ω
S4-1 (RAL-) - Body ground	Always	10 kΩ or higher
S4-2 (RAL+) - Body ground	Always	10 kΩ or higher
S4-3 (RBL-) - Body ground	Always	10 kΩ or higher
S4-4 (RBL+) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE SUSPENSION CONTROL ECU (LandCruiser RM000002BGR01UX.html)