Toyota Tundra Service Manual: Lost Communication with ECM / PCM "A" (U0100)

Toyota Tundra Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Lost Communication with ECM / PCM "A" (U0100)

DESCRIPTION

The combination meter communicates with the ECM via the CAN line.

DTC Code

DTC Detection Condition

Trouble Area

U0100

When either of following conditions is detected:

  • Vehicle speed 5 km/h (3 mph) or more and IG voltage 10.5 V or more
  • No communication with ECM continues for 3 seconds or more (No communication to 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 U0100 is not output

A

DTC U0100 is output

B

HINT:

If the CAN communication system DTC U0100 and another DTC are output at the same time, perform troubleshooting for the CAN communication system DTC U0100 first.

A

USE SIMULATION METHOD TO CHECK

B

Go to CAN COMMUNICATION SYSTEM

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    See More:

    Toyota Tundra Service Manual > Vehicle Stability Control System: System Diagram
    SYSTEM DIAGRAM Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method Skid control ECU (brake actuator assembly) Steering angle sensor (spiral with sensor cable sub-assembly) Steering angle sensor request signal CAN communication line Steering angle sensor (spiral with sensor cable ...

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