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

GO TO CAN COMMUNICATION SYSTEM

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 ...

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