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 > Sfi System: Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) (P0031,P0032,P0051,P0052,P101D,P103D)
DESCRIPTION Refer to DTC P2195 (See page ). HINT: Although the DTC titles say oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor. Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly. When one of these DTCs is ...

Toyota Tundra Owners Manual