Toyota Tundra Service Manual: ECU Malfunction (C14A7)

DESCRIPTION

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

C14A7

ECU Malfunction

INF Code: 71
- ECU internal malfunction
INF Code: 72
- Actuator operation driver IC malfunction in ECU
INF Code: 73
- Actuator operation driver IC operates abnormally even though there is no valid brake request
INF Code: 74
- When the trailer brake output is excessive while a brake request exists

Trailer brake control ECU (Brake control with bracket relay)

PROCEDURE

CHECK DTC

(a) Clear the DTCs.

Click here

(b) Turn the ignition switch off.

(d) Check if the same DTC is output.

Click here

Result	Proceed to
DTC is output.	A
DTCs are not output.	B

REPLACE BRAKE CONTROL WITH BRACKET RELAY

USE SIMULATION METHOD TO CHECK

Toyota Tundra Service Manual > Vehicle Stability Control System: Zero Point Calibration of Acceleration Sensor Undone (C1336)
DESCRIPTION The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication. The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, ...

Toyota Tundra Owners Manual