Last Modified: 11-29-2007 1.6 D
Service Category: Suspension Section: Suspension Control System
Model Year: 2008 Model: Sequoia Doc ID: RM000001N9M00BX
Title: SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/o AVS): TEST MODE PROCEDURE (2008 Sequoia)

TEST MODE PROCEDURE

1. TEST MODE PROCEDURE (SIGNAL CHECK)

HINT:

  • When entering the test mode, the suspension control ECU sets all the test mode DTCs first. After completing the test mode for each check item, the test mode DTCs that are determined to be normal by the suspension control ECU will be cleared. The test mode DTCs for other check items may not be cleared when only a certain signal is inspected.
  • When the test mode returns back to the normal mode, all the test mode DTCs will be cleared.

(a) Turn the ignition switch off.

(b) Check that the shift lever is in P.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON and the Techstream on.

(e) Enter the following menus: Chassis / Air suspension / Utility / Signal Check.

(f) The engine is started without stepping on the brake pedal.

(g) Check that the height control manual indicator light comes on for several seconds and then blink in Test Mode.

(h) Set each of the check items to the condition shown under Operation in the test mode table below.

Test Mode (Input Signal Check) Table

Check Item

Operation

Height control switch signal

Press the height control switch "UP" first and then press "DOWN"

Height control mode select switch signal

ON to OFF (Height control mode select switch pushed)

(i) Read the test mode DTCs by following the prompts on the Techstream screen.

(j) Check the malfunction using the code table below. After completing the test mode, disconnect the Techstream and turn the ignition switch off.

2. TEST MODE DTC CHART

HINT:

When entering test mode, the suspension control ECU stores all the test mode DTCs. If the deletion conditions for a test mode DTC are met, it is cleared.

(a) If a trouble code is displayed during the test mode DTC check, check the circuit listed for that code. For details of each code, refer to "See page" for the respective "DTC Code" in the chart.

DTC Code

Diagnosis

Trouble Area

See page

C1792

Height control switch circuit malfunction
  • Height control switch
  • Height control switch circuit
  • Suspension control ECU

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/o AVS): DESCRIPTION (2008 Sequoia)

C1793

Height control OFF switch circuit malfunction
  • Height control mode select switch
  • Height control mode select switch circuit
  • Suspension control ECU

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/o AVS): DESCRIPTION (2008 Sequoia)