Toyota Tacoma (2015-2018) Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0126,U0129,U0142)

Toyota Tacoma (2015-2018) Service Manual / Park Assist / Monitoring / Blind Spot Monitor System / Lost Communication with ECM / PCM "A" (U0100,U0126,U0129,U0142)

DESCRIPTION

These DTCs are stored if there is a malfunction in the CAN communication system connected to the blind spot monitor sensor.

HINT:

If CAN communication system DTCs are stored, they may also be stored for other systems.

DTC Code	DTC Detection Condition	Trouble Area
U0100	Lost communication with ECM	CAN communication system
U0126	Lost communication with steering sensor
U0129	Lost communication with skid control ECU (brake actuator assembly)
U0142	Lost communication with main body ECU (driver side junction block assembly)

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor main switch assembly (warning canceling switch assembly) is on.

PROCEDURE

CHECK DTC

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page Result ).

Result

Result	Proceed to
DTCs are output	A
No DTCs are output	B

HINT:

If CAN communication system DTCs are stored, they may also be stored for other systems.
If the CAN communication system has been inspected and repaired, the DTCs will not be output when rechecking for DTCs.
If these DTCs are output frequently, duplicate the conditions that cause the problem symptoms and perform the inspection again, even though the DTC was not output when rechecking for DTCs (See page ).

GO TO CAN COMMUNICATION SYSTEM

USE SIMULATION METHOD TO CHECK

Lost Communication with Blind Spot Monitor Slave Module (U0232)

DESCRIPTION This DTC is stored when the blind spot monitor sensor LH judges that there is a communication problem with the blind spot monitor sensor RH. DTC Code DTC Detectio ...

Short to +B in Buzzer (C1ABD,C1ABE)

DESCRIPTION DTC C1ABD is stored when the blind spot monitor sensor RH detects a +B short in rear cross traffic alert buzzer (blind spot monitor buzzer) circuit. DTC C1ABE is stored ...

Other materials:

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by check ...

TS and CG Terminal Circuit
DESCRIPTION In Test Mode (signal check), a malfunction in the speed sensor that cannot be detected when the vehicle is stopped can be detected while driving. Sensor check mode can be entered by connecting terminals TS and CG of the DLC3 and turning the ignition switch from off to ON. WIRING D ...

Removal
REMOVAL CAUTION / NOTICE / HINT CAUTION: Some of these service operations affect the SRS airbag system. Read the precautionary notices concerning the SRS airbag system before servicing (See page ). If the side airbag was deployed, replace the front seat assembly with a ne ...