Toyota CH-R Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0129,U0131,U0142,U0151,U0182,U0235,U023A)

Toyota CH-R Service Manual / Meter / Gauge / Display / Meter / Gauge System / Lost Communication with ECM / PCM "A" (U0100,U0129,U0131,U0142,U0151,U0182,U0235,U023A)

DESCRIPTION

The combination meter assembly communicates with the ECM, brake actuator assembly (skid control ECU), power steering ECU assembly, main body ECU (multiplex network body ECU), airbag sensor assembly, headlight control ECU sub-assembly LH*1, front camera module*2, millimeter wave radar sensor assembly*2 via CAN communication.

HINT:

*1: for LED Headlight

*2: w/ Toyota Safety Sense P

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

U0100

Lost Communication with ECM / PCM "A"

When IG voltage is 9.5 V or more and the following condition is detected:

  • No communication with ECM continues for 2 seconds or more
  • ECM
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0129

Lost Communication with Brake System Control Module

When IG voltage is 9.5 V or more and the following condition is detected:

  • No communication with brake actuator assembly (skid control ECU) continues for 3 seconds or more
  • Skid control ECU (brake actuator assembly)
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0131

Lost Communication with Power Steering Control Module

When IG voltage is 9.5 V or more and the following condition is detected:

  • No communication with power steering ECU assembly continues for 3 seconds or more
  • Power steering ECU assembly
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0142

Lost Communication with Body Control Module "B"

When IG voltage is 9.5 V or more and the following condition is detected:

  • No communication with main body ECU (multiplex network body ECU) continues for 3 seconds or more
  • Main body ECU (multiplex network body ECU)
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0151

Lost Communication with Restraints Control Module

When IG voltage is 9.5 V or more and the following condition is detected:

  • No communication with airbag sensor assembly continues for 10 seconds or more
  • Airbag sensor assembly
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0182

Lost Communication with Lighting Control Module Front

When IG voltage is 9.5 V or more and the following condition is detected:

  • No communica tion with headlight control ECU sub-assembly LH continues for 10 seconds or more
  • Headlight control ECU sub-assembly LH
  • CAN communica tion system
  • Combination meter assembly

DTC stored

*1

U0235

Lost Communication with Cruise Control Front Distance Range Sensor

When IG voltage is 9.5 V or more and the following condition is detected:

  • No communication with millimeter wave radar sensor assembly continues for 10 seconds or more
  • Millimeter wave radar sensor assembly
  • CAN communication system
  • Combination meter assembly

DTC stored

*2

U023A

Lost Communication with Front Camera Module

When IG voltage is 9.5 V or more and either of the following conditions is met:

  • No communication with lane departure warning camera continues for 10 seconds or more
  • No communication with millimeter wave radar sensor assembly continues for 10 seconds or more
  • Forward recognition camera
  • Millimeter wave radar sensor assembly
  • CAN communication system
  • Combination meter assembly

DTC stored

*2, *3
  • *1: for LED Headlight
  • *2: w/ Toyota Safety Sense P
  • *3: When U0235 and U023A are output simultaneously, there may be a malfunction in the millimeter wave radrar sensor assembly.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication DTCs are output.

Click here

Result

Proceed to

CAN communication DTCs are output.

A

CAN communication DTCs are not output.

B
A

GO TO CAN COMMUNICATION SYSTEM

B

USE SIMULATION METHOD TO CHECK

    Open in Turn Signal Circuit (B1507,B1508)
    DESCRIPTION These DTCs are stored when the combination meter assembly detects an open in a turn signal light circuit, or a short in a turn signal light circuit or the hazard warning light circuit ...

    Entire Combination Meter does not Operate
    DESCRIPTION This circuit is the power source circuit for the combination meter assembly. This circuit provides two types of power sources; one is a constant power source, and the other is an IG p ...

    Other materials:

    Toyota CH-R Service Manual > Lighting System: Light Sensor Circuit Malfunction (B1244)
    DESCRIPTION The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headl ...

    Toyota CH-R Service Manual > Main Body Ecu: Installation
    INSTALLATION PROCEDURE 1. INSTALL MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) NOTICE: Make sure that the connecting surfaces are free of foreign matter. Do not touch the main body ECU (multiplex network body ECU) connector. (a) Set the main body ECU (multiplex network bod ...

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