A960E Automatic Transmission. Dtc U0100 Lost Communication With Ecm/Pcm A

Transmission. Lexus Is250, Is220D. Gse20 Ale20

A960E Automatic Transmission. Lexus Is250, Is220D. Gse20 Ale20

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0100)

DTC U0100 Lost Communication with ECM/PCM "A"

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
U0100	Following conditions are met for 2 seconds (1 trip detection logic): Engine switch on (IG) Battery voltage is 10.5 V or more No intercommunication between engine control ECU and transmission control ECU	ECM

INSPECTION PROCEDURE

1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0100)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) position.

Turn on the tester

Select the item "Powertrain / ECT / DTC / Current or Pending".

Read the DTCs using the intelligent tester.

Result:

Display (DTC output)	Proceed to
U0100	A
U0100 and other DTCs	B

GO TO DTC CHART

REPLACE ECM