Toyota Tundra Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,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
U0125	Lost communication with airbag sensor assembly
U0126	Lost communication with spiral with sensor cable sub-assembly
U0129	Lost communication with skid control ECU (brake actuator assembly)
U0142	Lost communication with main body ECU (multiplex network body ECU)

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor system is turned on.

PROCEDURE

CHECK DTC

(a) Clear the DTCs (See page ).

(b) Recheck for DTCs and check if the same DTC is output again (See page ).

Result

Result	Proceed to
DTC U0100, U0125, U0126, U0129 and U0142 are not output.	A
DTC U0100, U0125, U0126, U0129 and U0142 are not 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

Toyota Tundra Service Manual > Occupant Classification System: Front Occupant Classification Sensor RH Collision Detection (B1786)
DESCRIPTION DTC B1786 is set when the occupant classification ECU receives a collision detection signal, which is sent by the front occupant detection sensor RH when an accident occurs. DTC B1786 is also set when the front seat frame with adjuster RH is subjected to a strong impact, even if an actua ...

Toyota Tundra Owners Manual