Toyota 4Runner manuals

Toyota 4Runner: Lost Communication with ECM / PCM "A" (U0100,U0126,U0129)

Toyota 4Runner Service Manual / Steering / Power Assist Systems / Power Steering System / Lost Communication with ECM / PCM "A" (U0100,U0126,U0129)

DESCRIPTION

The power steering ECU assembly receives signals from the ECM, steering angle sensor and master cylinder solenoid (skid control ECU) via the CAN communication system.

DTC Code

DTC Detection Condition

Trouble Area

U0100

The engine speed signal is lost.

CAN communication system

U0126

The steering angle signal is lost.

CAN communication system

U0129

The vehicle speed signal is lost.

CAN communication system

PROCEDURE

1.

CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Clear the DTCs (See page ).


(b) Check for DTCs (See page ).


Result

Result

Proceed to

DTC is not output

A

DTC is output

B


A

USE SIMULATION METHOD TO CHECK


B

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

Steering Angle Sensor Circuit (C15F1)
DESCRIPTION The power steering ECU assembly receives steering angle signals from the steering angle sensor via CAN communication. The power steering ECU assembly provides appropriate assisting fo ...

Vehicle Speed Signal (C1541)
DESCRIPTION The power steering ECU assembly receives vehicle speed signals from the master cylinder solenoid (skid control ECU) via CAN communication. The power steering ECU assembly provides app ...

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