Toyota 4Runner: Lost Communication with ECM / PCM "A" (U0100,U0129,U0131,U0151)

Toyota 4Runner Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Lost Communication with ECM / PCM "A" (U0100,U0129,U0131,U0151)

DESCRIPTION

The combination meter assembly communicates with the ECM via the CAN communication system (CAN No. 1 Bus).

DTC Code.	DTC Detection Condition	Trouble Area
U0100	IG voltage is 9.5 V or higher and the following condition is met: No communication with the ECM continues for 2 seconds or more.	ECM CAN communication system Combination meter assembly
U0129	IG voltage is 9.5 V or higher and the following condition is met: No communication with the skid control ECU continues for 3 seconds or more.	Master cylinder solenoid (Skid control ECU)1 Skid control ECU (Brake actuator assembly)2 CAN communication system Combination meter assembly
U0131	IG voltage is 9.5 V or higher and the following condition is met: No communication with the power steering ECU continues for 3 seconds or more.	Power steering ECU assembly CAN communication system Combination meter assembly
U0151	IG voltage is 9.5 V or higher and the following condition is met: No communication with the center airbag sensor assembly continues for 10 seconds or more.	Center airbag sensor assembly CAN communication system Combination meter assembly

*1: for 4WD
*2: for 2WD

PROCEDURE

1.	CONFIRM DTC OUTPUT

(a) Check for DTCs (See page ).

Result

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

HINT:

If CAN communication system DTC U0100, U0129, U0131 or U0151 and another DTC are output at the same time, perform troubleshooting for CAN communication system DTC U0100, U0129, U0131 or U0151 first.

GO TO CAN COMMUNICATION SYSTEM

USE SIMULATION METHOD TO CHECK

Fuel Sender Open Detected (B1500)

DESCRIPTION This DTC is stored when the combination meter detects a fuel sender gauge malfunction. DTC Code DTC Detection Condition Trouble Area B15 ...

Entire Combination Meter does not Operate

DESCRIPTION This circuit is the power source circuit for the meter. This circuit provides two types of power sources; one is a constant power source mainly used as a backup power source, and the ...

Other materials about Toyota 4Runner:

Data Signal Circuit between Radio Receiver and Extension Module
DESCRIPTION The stereo component tuner assembly sends the sound data signal or image data signal from a device to the radio and display receiver assembly via this circuit. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR ( ...

Check Mode Procedure
CHECK MODE PROCEDURE 1. DESCRIPTION (a) Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are s ...