Toyota 4Runner: Lost Communication with ECM (U0100,U0142,U0155)

Toyota 4Runner Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Lost Communication with ECM (U0100,U0142,U0155)

DESCRIPTION

The air conditioning amplifier communicates with the ECM, main body ECU (multiplex network body ECU) and combination meter through the CAN communication system.

DTC Code	DTC Detection Condition	Trouble Area
U0100	Lost communication with the ECM.	CAN communication system ECM
U0142	Lost communication with the main body ECU.	CAN communication system Main body ECU (multiplex network body ECU)
U0155	Lost communication with the combination meter.	CAN communication system Combination meter assembly

PROCEDURE

1.	CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Use the Techstream to check if the CAN communication system is functioning normally.

Result

Result	Proceed to
CAN DTC is not output	A
CAN DTC is output	B

USE SIMULATION METHOD TO CHECK

GO TO CAN COMMUNICATION SYSTEM

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page ...

Driver Side Solar Sensor Short Circuit (B14A2)

DESCRIPTION The automatic light control sensor (solar sensor), which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in auto mode. The ...

Other materials about Toyota 4Runner:

Inspection
INSPECTION PROCEDURE 1. INSPECT NAVIGATION ANTENNA ASSEMBLY (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specif ...

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 force in accordance with the steering angle signal. ...