DTC    U0101    Lost Communication with TCM

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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 through 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 1.25 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 ECM and TCM
  1. ECM
  2. TCM
  3. ECM to TCM circuit

WIRING DIAGRAM


A149013E03


INSPECTION PROCEDURE

1.CHECK ANY OTHER DTCS 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

    УКАЗАНИЕ:
    If any DTCs other than U0101 are output, troubleshoot those DTCs first.



B
GO TO DTC CHART (Нажмите здесь)
A


2.INSPECT TCM


    C146721E08

  1. Disconnect the A12 TCM connector.

  1. Turn the engine switch on (IG).

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A12-6 (+B) - Body ground
    		Engine switch on (IG)
    		11 to 14 V

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E5-7 (E1) - Body ground
    		Always
    		Below 1 Ω



NG
GO TO TCM POWER SOURCE CIRCUIT (Нажмите здесь)
OK


3.CHECK HARNESS AND CONNECTOR


    A152209E02

  1. Disconnect the A13 ECM connector.

  1. Disconnect the A12 TCM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance (Check for open):
    Tester Connection
    		Condition
    		Specified Condition
    A13-9 (CAN-) - A12-28 (CAN-)
    		Always
    		Below 1 Ω
    A13-10 (CAN+) - A12-18 (CAN+)
    		Always
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    A13-9 (CAN-) or A12-28 (CAN-) - Body ground
    		Always
    		10 kΩ or higher
    A13-10 (CAN+) - A12-18 (CAN+) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.REPLACE ECM

  1. Replace the ECM (see page Нажмите здесь).


NEXT


5.CHECK WHETHER DTC OUTPUT RECURS (DTC U0101)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the tester ON.

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

  1. Read DTCs.

    Result:

    Display (DTC output)
    		Proceed to
    No output
    		A
    U0101
    		B



B
REPLACE TCM (Нажмите здесь)
A

END