Last Modified: 11-29-2007 1.6 C
Service Category: Suspension Section: Suspension Control System
Model Year: 2008 Model: Sequoia Doc ID: RM000001N9B00AX
Title: SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DESCRIPTION (2008 Sequoia)

DTC

C1781

Suspension Control ECU Malfunction

DESCRIPTION

If a malfunction in the suspension control ECU is detected, DTC C1781 is output.

DTC Code

Detection Condition

Trouble Area

C1781

Suspension control ECU malfunction is detected
  • Wire harness or connector
  • Suspension control ECU

INSPECTION PROCEDURE

HINT:

  • If DTC C1782 (ECU malfunction) is displayed, perform the inspection necessary for DTC C1782 first SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DESCRIPTION (2008 Sequoia) .
  • If DTC U0122, U0100, U0126 and C1781 (Suspension Control ECU Malfunction) are output at the same time, perform the inspection necessary for the CAN communication system first.
  • The suspension control ECU, controlling the air suspension system, is activated when the ignition switch is turned ON.

    After 2 seconds, the "MAIN RELAY" built in the ECU is activated and the system is driven by +B power source.

    Vehicle height may increase after turning the ignition switch off and unloading the vehicle/letting people get out of the vehicle. In order to adjust the vehicle height, vehicle height control will continue for a while from then.

PROCEDURE

1.

CHECK FOR DTC

(a) Clear the DTC SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DTC CHECK / CLEAR (2008 Sequoia) .

(b) Perform a road test.

(c) Check for DTC SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is output

A

DTC is not output

B
A