C1731

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1731-C1734: Front Damping Force Control Actuator RH Circuit Malfunction


DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

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 C1782.
- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation Electronic Circuit Inspection Procedure; 2) DTC inspection; and 3) the Techstream inspection (Data List or Active Test). If no malfunctions are found in other areas, replace the suspension control ECU.
- If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Programming and Relearning.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Air Suspension System.

NEXT -- Continue to next step.

2. CHECK ABSORBER CONTROL ACTUATOR OPERATION (ACTIVE TEST)

(a) Turn the power switch OFF.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (IG) and the Techstream ON.

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

(e) According to the display on the Techstream screen, perform the "ACTIVE TEST".

(f) Check if the absorber control actuator operates to harden the suspension with the Techstream.

Air Suspension





OK:

The absorber control actuator operates.

NG -- INSPECT ABSORBER CONTROL ACTUATOR OF WHEEL TO BE INSPECTED

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

3. INSPECT ABSORBER CONTROL ACTUATOR OF WHEEL TO BE INSPECTED

(a) Remove the absorber control actuator, for front side Removal or for rear side Removal.

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





Standard resistance:

for Front RH: (C1731)





for Front LH: (C1732)









Standard resistance:

for Rear RH: (C1733)





for Rear LH: (C1734)





Result





E -- REPLACE REAR ABSORBER CONTROL ACTUATOR LH Removal

D -- REPLACE REAR ABSORBER CONTROL ACTUATOR RH Removal

C -- REPLACE FRONT ABSORBER CONTROL ACTUATOR LH Removal

B -- REPLACE FRONT ABSORBER CONTROL ACTUATOR RH Removal
A -- Continue to next step.

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

(a) Check the front side absorber control actuator.

(1) Connect the A15 or A45 front absorber control actuator connector.

(2) Disconnect the A39 and L88 ECU connectors.





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

Standard resistance:

for Front RH: (C1731)





for Front LH: (C1732)





(b) Check the rear side absorber control actuator.

(1) Connect the T1 or T2 rear absorber control actuator connector.

(2) Disconnect the R1 and L88 ECU connectors.

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





Standard resistance:

for Rear RH: (C1733)





for Rear LH: (C1734)





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SUSPENSION CONTROL ECU Removal