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)

DESCRIPTION This DTC is stored when the combination meter assembly detects an open in a turn signal light circuit, a short in a turn signal light circuit, or a short in the hazard warning light c ...

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:

A-TRAC Indicator Light Remains ON
DESCRIPTION This is the A-TRAC main switch circuit. When the A-TRAC switch is turned on with the transfer in L4, the A-TRAC function is available and the A-TRAC indicator light illuminates. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: When replacing the skid control ECU (master ...

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: The vehicle stability control system troubleshooting procedures are based on the premise that the CAN communication system is functioning normally. Check the CAN communication system first before troubleshooting the vehicle stability control system ...

Radar Cruise Control Presence Determination Malfunction (Engine / HV) (C1A52)
DESCRIPTION DTC C1A52 is stored when the ECM cannot recognize the millimeter wave radar sensor assembly. DTC No. Detection Item DTC Detection Condition Trouble Area C1A52 Radar Cruise Control Presence Determination Malfuncti ...