Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: FR Damping Force Control Actuator Circuit (C1731-C1734)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Suspension / Suspension Control / Adaptive Variable Suspension System / FR Damping Force Control Actuator Circuit (C1731-C1734)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

C1731

FR Damping Force Control Actuator Circuit

Either condition is met:

  • An open circuit is detected between the front absorber control actuator RH (front shock absorber assembly RH) and absorber control ECU.
  • A short circuit is detected between the front absorber control actuator RH (front shock absorber assembly RH) and absorber control ECU.
  • Front absorber control actuator RH (front shock absorber assembly RH)
  • Front skid control sensor wire RH
  • Wire harness or connector
  • Absorber control ECU

Does not come on

Yes

C1732

FL Damping Force Control Actuator Circuit

Either condition is met:

  • An open circuit is detected between the front absorber control actuator LH (front shock absorber assembly LH) and absorber control ECU.
  • A short circuit is detected between the front absorber control actuator LH (front shock absorber assembly LH) and absorber control ECU.
  • Front absorber control actuator LH (front shock absorber assembly LH)
  • Front skid control sensor wire LH
  • Wire harness or connector
  • Absorber control ECU

Does not come on

Yes

C1733

RR Damping Force Control Actuator Circuit

Either condition is met:

  • An open circuit is detected between the rear absorber control actuator RH (rear shock absorber assembly RH) and absorber control ECU.
  • A short circuit is detected between the rear absorber control actuator RH (rear shock absorber assembly RH) and absorber control ECU.
  • Rear absorber control actuator RH (rear shock absorber assembly RH)
  • Skid control sensor wire RH (No. 1 parking brake wire assembly)
  • Wire harness or connector
  • Absorber control ECU

Does not come on

Yes

C1734

RL Damping Force Control Actuator Circuit

Either condition is met:

  • An open circuit is detected between the rear absorber control actuator LH (rear shock absorber assembly LH) and absorber control ECU.
  • A short circuit is detected between the rear absorber control actuator LH (rear shock absorber assembly LH) and absorber control ECU.
  • Rear absorber control actuator LH (rear shock absorber assembly LH)
  • Skid control sensor wire LH (No. 2 parking brake wire assembly)
  • Wire harness or connector
  • Absorber control ECU

Does not come on

Yes

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before performing troubleshooting, inspect the connectors of related circuits.
  • If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first.

    Click here

  • Before replacing the absorber control ECU, perform all of the following:
    • Symptom simulation.

      Click here

    • DTC inspection.

      Click here

    • Techstream inspection.

      Click here

      • If no malfunctions are found in other areas, replace the absorber control ECU.
  • After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.

    Click here

PROCEDURE

1.

CLEAR DTCS

(a) Clear the DTCs.

Click here

Chassis > Air suspension > Clear DTCs
NEXT

2.

PERFORM ACTIVE TEST USING TECHSTREAM (FOUR-WHEEL DAMPING FORCE FULL HARD/SOFT)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Turn the Techstream on.

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

Chassis > Air suspension > Active Test

Tester Display

Measurement Item

Restrict Condition

Four-Wheel Damping Force Full Hard

Four-wheel damper step fixed at full hard
  • Vehicle stopped
  • Engine idling
  • When the absorber control actuator is normal
  • When the power source voltage is normal

Four-Wheel Damping Force Full Soft

Four-wheel damper step fixed at full soft
  • Vehicle stopped
  • Engine idling
  • When the absorber control actuator is normal
  • When the power source voltage is normal
Chassis > Air suspension > Active Test

Tester Display

Four-Wheel Damping Force Full Hard
Chassis > Air suspension > Active Test

Tester Display

Four-Wheel Damping Force Full Soft

(f) When performing the Active Test, read each Tester Display item for the applicable wheel on the Data List and check the operation status of the absorber control actuator for the applicable wheel.

Chassis > Air suspension > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Solenoid Aim Electric Current Level for Control

Target solenoid current value (front wheel RH)

Min.: 0 mA

Max.: 2040 mA

Changes depending on target damping force

-

FL Solenoid Aim Electric Current Level for Control

Target solenoid current value (front wheel LH)

Min.: 0 mA

Max.: 2040 mA

Changes depending on target damping force

-

RR Solenoid Aim Electric Current Level for Control

Target solenoid current value (rear wheel RH)

Min.: 0 mA

Max.: 2040 mA

Changes depending on target damping force

-

RL Solenoid Aim Electric Current Level for Control

Target solenoid current value (rear wheel LH)

Min.: 0 mA

Max.: 2040 mA

Changes depending on target damping force

-

FR Solenoid Drive Duty

Solenoid drive duty value (front wheel RH)

Min.: 0%

Max.: 100%

Changes depending on target damping force

-

FL Solenoid Drive Duty

Solenoid drive duty value (front wheel LH)

Min.: 0%

Max.: 100%

Changes depending on target damping force

-

RR Solenoid Drive Duty

Solenoid drive duty value (rear wheel RH)

Min.: 0%

Max.: 100%

Changes depending on target damping force

-

RL Solenoid Drive Duty

Solenoid drive duty value (rear wheel LH)

Min.: 0%

Max.: 100%

Changes depending on target damping force

-

FR Solenoid Electric Current

Solenoid current value (front wheel RH)

Min.: 0 mA

Max.: 2040 mA

Changes depending on target damping force

-

FL Solenoid Electric Current

Solenoid current value (front wheel LH)

Min.: 0 mA

Max.: 2040 mA

Changes depending on target damping force

-

RR Solenoid Electric Current

Solenoid current value (rear wheel RH)

Min.: 0 mA

Max.: 2040 mA

Changes depending on target damping force

-

RL Solenoid Electric Current

Solenoid current value (rear wheel LH)

Min.: 0 mA

Max.: 2040 mA

Changes depending on target damping force

-
Chassis > Air suspension > Data List

Tester Display

FR Solenoid Aim Electric Current Level for Control

FL Solenoid Aim Electric Current Level for Control

RR Solenoid Aim Electric Current Level for Control

RL Solenoid Aim Electric Current Level for Control

FR Solenoid Drive Duty

FL Solenoid Drive Duty

RR Solenoid Drive Duty

RL Solenoid Drive Duty

FR Solenoid Electric Current

FL Solenoid Electric Current

RR Solenoid Electric Current

RL Solenoid Electric Current

OK:

The Data List step numbers, drive duty values and current values change according to the operation of the Active Test.

NG

GO TO STEP 4

OK

3.

RECONFIRM DTC

(a) Check that the same DTC is output.

Click here

Chassis > Air suspension > Trouble Codes

Result

Proceed to

DTC is output

A

DTC is not output

B
B

USE SIMULATION METHOD TO CHECK

A

4.

INSPECT ABSORBER CONTROL ACTUATOR (SHOCK ABSORBER ASSEMBLY)

(a) Turn the engine switch off.

(b) Inspect the absorber control actuator (shock absorber assembly).

for Front Side: Click here

for Rear Side: Click here

Result

Proceed to

OK (for Front Side)

A

OK (for Rear Side)

B

NG (Front absorber control actuator RH (front shock absorber assembly RH) malfunction)

C

NG (Front absorber control actuator LH (front shock absorber assembly LH) malfunction)

D

NG (Rear absorber control actuator RH (rear shock absorber assembly RH) malfunction)

E

NG (Rear absorber control actuator LH (rear shock absorber assembly LH) malfunction)

F
B

GO TO STEP 7

C

REPLACE FRONT ABSORBER CONTROL ACTUATOR RH (FRONT SHOCK ABSORBER ASSEMBLY RH)

D

REPLACE FRONT ABSORBER CONTROL ACTUATOR LH (FRONT SHOCK ABSORBER ASSEMBLY LH)

E

REPLACE REAR ABSORBER CONTROL ACTUATOR RH (REAR SHOCK ABSORBER ASSEMBLY RH)

F

REPLACE REAR ABSORBER CONTROL ACTUATOR LH (REAR SHOCK ABSORBER ASSEMBLY LH)

A

5.

INSPECT FRONT SKID CONTROL SENSOR WIRE

(a) Disconnect the z14 or z13 front skid control sensor wire connector.

(b) Disconnect the A58 or A60 front skid control sensor wire connector.

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

*A

for RH

*B

for LH

*a

Component without harness connected (Front Skid Control Sensor Wire)

-

-

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

z14-2 - A58-2 (FAR+)

Always

Below 1 Ω

z14-1 - A58-1 (FAR-)

z14-2 or A58-2 (FAR+) - Body ground and other terminals

Always

10 kΩ or higher

z14-1 or A58-1 (FAR-) - Body ground and other terminals
for LH

Tester Connection

Condition

Specified Condition

z13-2 - A60-2 (FAL+)

Always

Below 1 Ω

z13-1 - A60-1 (FAL-)

z13-2 or A60-2 (FAL+) - Body ground and other terminals

Always

10 kΩ or higher

z13-1 or A60-1 (FAL-) - Body ground and other terminals

Result

Proceed to

OK

A

NG (for RH)

B

NG (for LH)

C
B

REPLACE FRONT SKID CONTROL SENSOR WIRE RH

C

REPLACE FRONT SKID CONTROL SENSOR WIRE LH

A

6.

CHECK HARNESS AND CONNECTOR (FRONT SKID CONTROL SENSOR WIRE - ABSORBER CONTROL ECU)

(a) Disconnect the K59 absorber control ECU connector.

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

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

A58-2 (FAR+) - K59-5 (FAR+)

Always

Below 1 Ω

A58-1 (FAR-) - K59-6 (FAR-)

A58-2 (FAR+) or K59-5 (FAR+) - Body ground and other terminals

Always

10 kΩ or higher

A58-1 (FAR-) or K59-6 (FAR-) - Body ground and other terminals
for LH

Tester Connection

Condition

Specified Condition

A60-2 (FAL+) - K59-2 (FAL+)

Always

Below 1 Ω

A60-1 (FAL-) - K59-3 (FAL-)

A60-2 (FAL+) or K59-2 (FAL+) - Body ground and other terminals

Always

10 kΩ or higher

A60-1 (FAL-) or K59-3 (FAL-) - Body ground and other terminals
OK

REPLACE ABSORBER CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT SKID CONTROL SENSOR WIRE (PARKING BRAKE WIRE ASSEMBLY)

(a) Disconnect the Y6 or Y3 skid control sensor wire (parking brake wire assembly) connector.

(b) Disconnect the YK3 or YK4 skid control sensor wire (parking brake wire assembly) connector.

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

*A

for RH

*B

for LH

*a

Component without harness connected (Skid Control Sensor Wire (Parking Brake Wire Assembly))

-

-

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

Y6-1 - YK3-3

Always

Below 1 Ω

Y6-3 - YK3-4

Y6-1 or YK3-3 - Body ground and other terminals

Always

10 kΩ or higher

Y6-3 or YK3-4 - Body ground and other terminals
for LH

Tester Connection

Condition

Specified Condition

Y3-1 - YK4-3

Always

Below 1 Ω

Y3-3 - YK4-4

Y3-1 or YK4-3 - Body ground and other terminals

Always

10 kΩ or higher

Y3-3 or YK4-4 - Body ground and other terminals

Result

Proceed to

OK

A

NG (for RH)

B

NG (for LH)

C
B

REPLACE SKID CONTROL SENSOR WIRE RH (NO. 1 PARKING BRAKE WIRE ASSEMBLY)

C

REPLACE SKID CONTROL SENSOR WIRE LH (NO. 2 PARKING BRAKE WIRE ASSEMBLY)

A

8.

CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE (PARKING BRAKE WIRE ASSEMBLY) - ABSORBER CONTROL ECU)

(a) Disconnect the K60 absorber control ECU connector.

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

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

YK3-3 - K60-6 (RAR+)

Always

Below 1 Ω

YK3-4 - K60-5 (RAR-)

YK3-3 or K60-6 (RAR+) - Body ground and other terminals

Always

10 kΩ or higher

YK3-4 or K60-5 (RAR-) - Body ground and other terminals
for LH

Tester Connection

Condition

Specified Condition

YK4-3 - K60-2 (RAL+)

Always

Below 1 Ω

YK4-4 - K60-1 (RAL-)

YK4-3 or K60-2 (RAL+) - Body ground and other terminals

Always

10 kΩ or higher

YK4-4 or K60-1 (RAL-) - Body ground and other terminals
OK

REPLACE ABSORBER CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Front Acceleration Sensor RH Malfunction (C1715-C1717,C1796-C1798)

    Suspension Control ECU Malfunction (C1781)

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