Toyota Tundra Service Manual: ECU Malfunction (B1003)

Toyota Tundra Service Manual / Power Source, Network / Can Communication / Can Communication System / ECU Malfunction (B1003)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1003

ECU Malfunction

A malfunction in the non-volatile storage of the central gateway ECU (network gateway ECU) is detected.

Central gateway ECU (network gateway ECU)

PROCEDURE

1.

RECONFIRM DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Central Gateway / Trouble Codes.

Result

Proceed to

DTC B1003 is not output from the central gateway ECU (network gateway ECU)

A

DTC B1003 is output from the central gateway ECU (network gateway ECU)

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

    Audio Receiver Assembly Communication Stop Mode

    Blind Spot Monitor Sensor Communication Stop Mode

    See More:

    Toyota Tundra Service Manual > Sfi System: Engine Coolant Temperature Circuit Malfunction (P0115,P0117,P0118)
    DESCRIPTION A thermistor, whose resistance value varies according to the ECT, is built into the Engine Coolant Temperature (ECT) sensor. The structure of the sensor and its connection to the ECM are the same as those of the Intake Air Temperature (IAT) sensor. HINT: When DTC P0115, P0117 or P0118 is ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.0152