DTC U1212 Can-HS TCM Data Abnormal: Wiring Diagram

WARNING: This page is about a different car, the 2008 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

VDC model:

Fig 1: CAN-HS TCM Data Abnormal - Wiring Diagram (VDC Model)

Courtesy of SUBARU OF AMERICA, INC.

ABS model

Fig 2: CAN-HS TCM Data Abnormal - Wiring Diagram (ABS Model)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Using the Subaru Select Monitor, read all DTCs.	Are there any U1201, U1202, DTCs other than for the body integrated unit?	Perform the diagnosis according to DTC.	Go to step 2.
2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1212 a current malfunction?	Go to step 3.	Go to step 4.
3 CHECK DTC. Turn the ignition switch to OFF. Disconnect the connector from TCM. Connect the disconnected connectors. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1212 a current malfunction?	Replace the TCM. <Ref. to TRANSMISSION CONTROL MODULE (TCM) . >	Go to step 4.
4 CHECK HARNESS. Turn the ignition switch to OFF. Shake the harness used for CAN communication circuit. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1212 a current malfunction?	Repair or replace the harness.	Go to step 5.
5 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector that is connected to high speed CAN circuit.	Is there poor contact in connector terminal?	Repair the connector terminal, or replace harness.	Temporary communication error occurs.