Toyota Tacoma 2015-2018 Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0129,U0142,U0151,U0163,U023A,U1104)

Toyota Tacoma 2015-2018 Service Manual / Meter / Gauge / Display / Meter / Gauge System / Lost Communication with ECM / PCM "A" (U0100,U0129,U0142,U0151,U0163,U023A,U1104)

DESCRIPTION

The combination meter communicates with the ECM, skid control ECU, power steering ECU, main body ECU (multiplex network body ECU), airbag sensor assembly, navigation receiver assembly*1, radio and display receiver assembly*2, Forward recognition camera*3 and Millimeter wave radar sensor assembly*3 via the CAN communication system.

DTC No.	DTC Detection Condition	Trouble Area
U0100	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
U0129	When IG voltage is 9.5 V or more and the following condition is detected: No communication with skid control ECU continues for 3 seconds or more	Brake actuator assembly (skid control ECU)4 Brake booster with master cylinder assembly5 CAN communication system Combination meter assembly
U0142	When IG voltage is 9.5 V or more and the following condition is detected: No communication with power steering ECU continues for 3 seconds or more	Main body ECU (multiplex network body ECU) CAN communication system Combination meter assembly
U0151	When IG voltage is 9.5 V or more and the following condition is detected: No communication with center airbag sensor assembly continues for 10 seconds or more	Airbag sensor assembly CAN communication system Combination meter assembly
U0163	When IG voltage is 9.5 V or more and the following condition is detected: No communication with navigation receiver assembly continues for 3 seconds or more1 No communication with radio and display receiver assembly continues for 3 seconds or more2	Navigation receiver assembly1 Radio and display receiver assembly2 CAN communication system Combination meter assembly
U023A	When IG voltage is 9.5 V or more and the following condition is detected: No communication with center forward recognition camera continues for 10 seconds or more	Forward recognition camera CAN communication system Combination meter assembly
U1104	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

*1: for Navigation Receiver Type
*2: for Radio and Display Type
*3: w/ Toyota Safety Sense P
*4: for Vacuum Booster Type
*5: for Hydraulic Booster Type

PROCEDURE

1.	CONFIRM DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch ON.

(d) Enter the following menus: Body Electrical / Combination Meter / Trouble Codes.

(e) Clear DTCs.

See page (f) Drive the vehicle at more than 5 km/h (3.1 mph) for at least 60 seconds.

(f) Drive the vehicle at more than 5 km/h (3.1 mph) for at least 60 seconds.

(g) Stop the vehicle.

(h) Check DTCs.

See page Result

Result

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

HINT:

If CAN communication system DTC U0100, U0129, U0142, U0151, U0163, U023A or U1104 and another DTC are output at the same time, perform troubleshooting for CAN communication system DTC U0100, U0129, U0142, U0151, U0163, U023A or U1104 first.

GO TO CAN COMMUNICATION SYSTEM

USE SIMULATION METHOD TO CHECK

Open in Turn Signal Circuit (B1507,B1508)

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