Toyota 4Runner manuals

Toyota 4Runner: 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


A

USE SIMULATION METHOD TO CHECK


B

GO TO CAN COMMUNICATION SYSTEM

Compressor Lock Sensor Circuit (B1422)
SYSTEM DESCRIPTION The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication. The air conditioning amplifier assembly reads the difference between comp ...

Air Outlet Damper Control Servo Motor Circuit (B1443)
DESCRIPTION The damper servo sub-assembly (mode damper servo) sends pulse signals to inform the No. 1 air conditioning amplifier assembly of the damper position. The No. 1 air conditioning amplif ...

Other materials about Toyota 4Runner:

Fuel information
You must only use unleaded gasoline in your vehicle. Select octane rating 87 (Research Octane Number 91) or higher. Use of unleaded gasoline with an octane rating lower than 87 may result in engine knocking. Persistent knocking can lead to engine damage. ...

Air Conditioning Control Panel Circuit
DESCRIPTION This circuit consists of the heater control assembly and air conditioning amplifier assembly. When the heater control assembly is operated, signals are transmitted to the air conditioning amplifier assembly through the LIN communication system ...

© 2016-2025 | www.to4runner.net

0.0069