Last Modified: 11-29-2007 1.6 C
Service Category: Suspension Section: Suspension Control System
Model Year: 2008 Model: Sequoia Doc ID: RM000002PEJ007X
Title: SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DESCRIPTION (2008 Sequoia)

DTC

C1783

Speed Signal Communication Error

DESCRIPTION

The speed sensors monitor the speed of the wheels, and send appropriate speed signals to the suspension control ECU through the skid control ECU. If trouble occurs in either the front speed sensor or rear speed sensor, DTC C1783 is output.

DTC Code

Detection Condition

Trouble Area

C1783

Speed sensor circuit malfunction for 1 second or more.
  • Speed sensors
  • Skid control ECU
  • Wire harness or connector
  • Suspension control ECU

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK FOR DTC (AIR SUSPENSION SYSTEM)

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

(b) Perform a road test.

(c) Check if DTC C1783 and U0122 are output SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is not output

A

DTC is output

B
A

2.

CHECK FOR DTC (BRAKE CONTROL SYSTEM)

(a) Check if DTC C1783 and a brake control system speed sensor malfunction DTC (C0200/31, C0205/32, C0210/33 or C0215/35) are output BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is not output

A

DTC is output

B
A

3.

READ VALUE USING TECHSTREAM (WHEEL SPEED)

(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 / Data List.

Air Suspension

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FR Wheel Speed

Wheel speed (Front right) reading / min.: 0 km/h (0 mph), max.: 255 km/h (159 mph)

Actual vehicle speed

Speed indicated on the speedometer

FL Wheel Speed

Wheel speed (Front left) reading / min.: 0 km/h (0 mph), max.: 255 km/h (159 mph)

Actual vehicle speed

Speed indicated on the speedometer

RR Wheel Speed

Wheel speed (Rear right) reading / min.: 0 km/h (0 mph), max.: 255 km/h (159 mph)

Actual vehicle speed

Speed indicated on the speedometer

RL Wheel Speed

Wheel speed (Rear left) reading / min.: 0 km/h (0 mph), max.: 255 km/h (159 mph)

Actual vehicle speed

Speed indicated on the speedometer

OK:

Vehicle speed indicated on the Techstream indicates the actual speed.

OK