Dtc U0101 Lost Communication With Tcm

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Engine Control System. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0101)

DTC U0101 Lost Communication with TCM


DESCRIPTION

The engine control unit and the transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control ECU with the Controller Area Network (CAN).
If there is a problem in this intercommunication, the ECM sets a DTC.

DTC No.
DTC Detection Condition
Trouble Area
U0101
  1. Following conditions are met for 2 seconds (1 trip detection logic):
    1. Engine switch on (IG)
    2. Battery voltage is 10.5 V or more
    3. No intercommunication between engine control ECU and transmission control ECU
ECM

INSPECTION PROCEDURE

1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0101)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the tester ON.

  1. Enter the following menus: Powertrain / Engine / DTC.

  1. Read DTCs.

    Result:

    Display (DTC output)
    		Proceed to
    U0101
    		A
    U0101 and other DTCs
    		B


B
GO TO DTC CHART
A

REPLACE ECM