Toyota Tundra Service Manual: Lost Communication with Brake System Control Module (U0129)

Toyota Tundra Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Lost Communication with Brake System Control Module (U0129)

DESCRIPTION

The combination meter communicates with the skid control ECU via the CAN line.

DTC Code

DTC Detection Condition

Trouble Area

U0129

When either of following conditions is detected:

  • 15 seconds have elapsed since engine started and IG voltage 10.5 V or more
  • No communication with skid control ECU continues for 3 seconds or more (No communication with ECM or skid control ECU continues for 60 seconds or more)

CAN communication system

WIRING DIAGRAM

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs and note any codes that are output (See page ).

(b) Clear the DTC (See page ).

(c) Recheck for DTC (See page ).

Result

Result

Proceed to

DTC U0129 is not output

A

DTC U0129 is output

B

HINT:

If the CAN communication system DTC U0129 and another DTC are output at the same time, perform troubleshooting for the CAN communication system DTC U0129 first.

A

USE SIMULATION METHOD TO CHECK

B

Go to CAN COMMUNICATION SYSTEM

    Lost Communication with ECM / PCM "A" (U0100)

    Communication with BODY ECU (Receive) (U0142)

    See More:

    Toyota Tundra Service Manual > Can Communication System: Check Bus 2 Line for Short to +B
    DESCRIPTION There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and termi ...

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