Last Modified: 11-29-2007 1.6 C
Service Category: Suspension Section: Suspension Control System
Model Year: 2008 Model: Sequoia Doc ID: RM000002PE8006X
Title: SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DESCRIPTION (2008 Sequoia)

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

DTC Code

Detection Condition

Trouble Area

C1731

When either of the following is detected:

  • 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.
  • Wire harness or connector
  • Front absorber control actuator RH
  • Suspension control ECU

C1732

When either of the following is detected:

  • 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.
  • Wire harness or connector
  • Front absorber control actuator LH
  • Suspension control ECU

C1733

When either of the following is detected:

  • 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.
  • Wire harness or connector
  • Rear absorber control actuator RH
  • Suspension control ECU

C1734

When either of the following is detected:

  • 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.
  • Wire harness or connector
  • Rear absorber control actuator LH
  • Suspension control ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (REAR GATE SOLENOID)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON, and turn the Techstream main switch on.

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

Air Suspension

Tester Display

Test Part

Control Range

Diagnostic Note

Damper Step FR

Damper step (Front RH) /

min.: 0 step

max.: 255 steps

min.: 1 step

max.: 16 steps

-

Damper Step FL

Damper step (Front LH) /

min.: 0 step

max.: 255 steps

min.: 1 step

max.: 16 steps

-

Damper Step RR

Damper step (Rear RH) /

min.: 0 step

max.: 255 steps

min.: 1 step

max.: 16 steps

-

Damper Step RL

Damper step (Rear LH) /

min.: 0 step

max.: 255 steps

min.: 1 step

max.: 16 steps

-

OK:

The absorber control actuator operates.

OK

2.

INSPECT ABSORBER CONTROL ACTUATOR

(a) Turn the ignition switch off.

(b) Check the front absorber control actuator RH: (C1731).

(1) Disconnect the A44 actuator connector.

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

Standard Resistance:

Tester Connection

Sensor 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

(c) Check the front absorber control actuator LH: (C1732).

(1) Disconnect the A45 actuator connector.

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

Standard Resistance:

Tester Connection

Sensor 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

(d) Check the rear absorber control actuator RH: (C1733).

(1) Disconnect the Q6 actuator connector.

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

Standard Resistance:

Tester Connection

Sensor 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

(e) Check the rear absorber control actuator LH: (C1734).

(1) Disconnect the Q2 actuator connector.

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

Standard Resistance:

Tester Connection

Sensor 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

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
A

3.

CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ACTUATOR - ECU AND BODY GROUND)

(a) Check the front side absorber control actuator.

(1) Connect the A44 or A45 front absorber control actuator connector.

(2) Disconnect the O16 ECU connector.

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

Standard Resistance:

for Front RH: (C1731)

Tester Connection

Condition

Specified Condition

A44-1 (FAR+) - O16-3 (FAR+)

Always

Below 1 Ω

A44-2 (FAR-) - O16-4 (FAR-)

Always

Below 1 Ω

A44-3 (FBR+) - O16-5 (FBR+)

Always

Below 1 Ω

A44-4 (FBR-) - O16-6 (FBR-)

Always

Below 1 Ω

A44-1 (FAR+) or O16-3 (FAR+) - Body ground

Always

10 kΩ or higher

A44-2 (FAR-) or O16-4 (FAR-) - Body ground

Always

10 kΩ or higher

A44-3 (FBR+) or O16-5 (FBR+) - Body ground

Always

10 kΩ or higher

A44-4 (FBR-) or O16-6 (FBR-) - Body ground

Always

10 kΩ or higher

for Front LH: (C1732)

Tester Connection

Condition

Specified Condition

A45-1 (FAL+) - O16-10 (FAL+)

Always

Below 1 Ω

A45-2 (FAL-) - O16-1 (FAL-)

Always

Below 1 Ω

A45-3 (FBL+) - O16-11 (FBL+)

Always

Below 1 Ω

A45-4 (FBL-) - O16-2 (FBL-)

Always

Below 1 Ω

A45-1 (FAL+) or O16-10 (FAL+) - Body ground

Always

10 kΩ or higher

A45-2 (FAL-) or O16-1 (FAL-) - Body ground

Always

10 kΩ or higher

A45-3 (FBL+) or O16-11 (FBL+) - Body ground

Always

10 kΩ or higher

A45-4 (FBL-) or O16-2 (FBL-) - Body ground

Always

10 kΩ or higher

(b) Check the rear side absorber control actuator.

(1) Connect the Q2 or Q6 rear absorber control actuator connector.

(2) Disconnect the O17 ECU connector.

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

Standard Resistance:

for Rear RH: (C1733)

Tester Connection

Condition

Specified Condition

Q6-1 (RAR-) - O17-7 (RAR-)

Always

Below 1 Ω

Q6-2 (RAR+) - O17-1 (RAR+)

Always

Below 1 Ω

Q6-3 (RBR-) - O17-8 (RBR-)

Always

Below 1 Ω

Q6-4 (RBR+) - O17-2 (RBR+)

Always

Below 1 Ω

Q6-1 (RAR-) or O17-7 (RAR-) - Body ground

Always

10 kΩ or higher

Q6-2 (RAR+) or O17-1 (RAR+) - Body ground

Always

10 kΩ or higher

Q6-3 (RBR-) or O17-8 (RBR-) - Body ground

Always

10 kΩ or higher

Q6-4 (RBR+) or O17-2 (RBR+) - Body ground

Always

10 kΩ or higher

for Rear LH: (C1734)

Tester Connection

Condition

Specified Condition

Q2-1 (RAL-) - O17-9 (RAL-)

Always

Below 1 Ω

Q2-2 (RAL+) - O17-3 (RAL+)

Always

Below 1 Ω

Q2-3 (RBL-) - O17-10 (RBL-)

Always

Below 1 Ω

Q2-4 (RBL+) - O17-4 (RBL+)

Always

Below 1 Ω

Q2-1 (RAL-) or O17-9 (RAL-) - Body ground

Always

10 kΩ or higher

Q2-2 (RAL+) or O17-3 (RAL+) - Body ground

Always

10 kΩ or higher

Q2-3 (RBL-) or O17-10 (RBL-) - Body ground

Always

10 kΩ or higher

Q2-4 (RBL+) or O17-4 (RBL+) - Body ground

Always

10 kΩ or higher
OK