Toyota 4Runner Quiz
Steering

Lost Communication with ECM / PCM "A" (U0100,U0126,U0129)

In this manual: Steering
General — 25Audio / Visual / Telematics — 283Brake — 187Drivetrain — 204Power Source / Network — 79Steering — 76Suspension — 130Vehicle Exterior — 391Vehicle Interior — 693
~1min read
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)

Test yourself

A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.