Toyota 4Runner: 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 .gif)
).
(b) Check for DTCs (See page ).
Result
|
Result |
Proceed to |
|---|---|
|
DTC is not output |
A |
|
DTC is output |
B |
| A | .gif) |
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 ...
Other materials about Toyota 4Runner:
Installation
INSTALLATION
PROCEDURE
1. INSTALL REAR FLOOR SIDE AIRBAG SENSOR
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-)
bat ...
General Maintenance
GENERAL MAINTENANCE
PROCEDURE
1. INSPECT STEERING LINKAGE AND GEAR HOUSING
(a) Check the steering wheel free play.
(b) Check the steering linkage for looseness or damage.
(1) Check that the tie rod ends do not have excessive play.
(2) Check that the dust ...
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