Dtc C1776 Speed Sensor Circuit

Suspension & Axle. Lexus Gs430, Gs300. Uzs190 Grs190
Suspension Control. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

READ VALUE OF INTELLIGENT TESTER

RECONFIRM DTC

DTC C1776 Speed Sensor Circuit


DESCRIPTION

  1. The speed sensor detects the wheel speed and transmits the appropriate vehicle speed signal to the absorber control ECU through the skid control ECU via CAN communication system.
  2. This DTC (C1776) is output if any malfunction exists in the speed sensor FR, FL, RR, or RL system.

DTC No.
DTC Detection Condition
Trouble Area
C1776
The speed sensor malfunction signal is received for 1 second or more.
  1. CAN communication system
  2. Brake control system
  3. Speed sensor circuit
  4. Absorber control system

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Suspension Control.Adaptive Variable Suspension System. Dtc C1776 Speed Sensor Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the absorber control ECU, check the acceleration sensor assembly signal after replacement (Click here).
HINT:
  1. Check the condition of each related circuit connector before troubleshooting (Click here).
  2. When C1774 is output, inspect and repair the trouble areas indicated by C1774 first (Click here).
1.CHECK DTC

  1. Check if any speed sensor DTCs (Brake control system trouble code: C0200/31, C0205/32, C0210/33, C0215/34, C1235/35, C1236/36, C1238/38, C1239/39) or a CAN communication DTC (U0122/67) is output together with DTC C1776 (Click here and Click here).

    Result:

    Result
    		Proceed To
    Only DTC C1776 is output
    		A
    Speed sensor DTC is output (Brake control system trouble code)
    		B
    CAN communication DTC is output
    		C


B
REPAIR CIRCUIT INDICATED BY OUTPUT CODE

C
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A


2.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to DLC3.

  1. Start the engine and turn the intelligent tester main switch on.

  1. Select "Data List" mode on the intelligent tester (Click here).

    Data List: EMS
    Item
    		Measurement Item/
    Range (Display)
    		Normal Condition
    		Diagnostic Note
    Vehicle Speed
    		Vehicle speed reading / min.: 0 km/h (0 mph), max: 255 km/h (158 mph)
    		Actual wheel speed
    		Speed indicated on speedometer

  1. Check that there is no difference between the speed value output from the skid control ECU displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle.

    OK:
    The speed value output from the skid control ECU displayed on the intelligent tester is the same as the actual vehicle speed.


NG
CHECK BRAKE CONTROL SYSTEM (SPEED SENSOR SIGNAL)
OK


3.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed To
    DTC is output
    		A
    DTC is output (When troubleshooting accordance with the PROBLEM SYMPTOMS TABLE)
    		B
    DTC is not output
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
END
A

REPLACE ABSORBER CONTROL ECU