Honda Civic manuals

Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc u0426 invalid data received from immobilizer control module

DTC DETECTING CONDITION:

Invalid data was transmitted from immobilizer CM.

TROUBLE SYMPTOM:

Immobilizer does not operate normally.

STEPCHECKYESNO

1.CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.

Was the basic diagnostic procedure performed up to STEP 8-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

Perform the basic diagnostic procedure. Basic Diagnostic Procedure

2.CHECK DTC.

Check the displayed DTC.

Are DTCs other than U*** displayed-

Perform the diagnosis according to DTC.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

3.CHECK DTC.

Check the displayed DTC.

Is DTC for the bus off or the data no-receive displayed-

Perform the diagnosis according to DTC.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

4.CHECK DTC.

Check the displayed DTC.

Is U0426 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

5.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Disconnect the immobilizer CM connector.

3) Connect the disconnected connectors.

4) Read the DTC using Subaru Select Monitor.

Is U0426 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

6.CHECK DTC.

Using the Subaru Select Monitor, read DTC of all the systems.

Is the immobilizer data abnormal detected in several modules-

Replace the immobilizer CM. Immobilizer Control Module

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

7.REPLACE MODULE.

1) Replace the immobilizer CM.

2) Read the DTC using Subaru Select Monitor.

Is U0426 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

System is normal.

8.CHECK MODULE.

1) Reinstall the immobilizer CM.

2) Replace the module that the DTC has been detected.

3) Read the DTC using Subaru Select Monitor.

Is U0426 a current malfunction-

Replace the immobilizer CM. Immobilizer Control Module

System is normal.

9.CHECK HARNESS.

1) Shake the harness, and check for poor contact.

2) Read the DTC using Subaru Select Monitor.

Is U0426 a current malfunction-

Repair the poor contact of harness, or replace the harness.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0426 INVALID DATA RECEIVED FROM IMMOBILIZER CONTROL MODULE

10.CHECK CONNECTOR.

Check the connector used for high speed CAN for poor contact.

Is there poor contact of connector-

Repair the connector that has poor contact, or replace harness.

It is possible that temporary poor communication occurs. Delete the DTC.

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Other materials:

Inspection
• Check the forward clutch drum, internal gear, sun gear and forward clutch piston lip for wear or damage.• Inspect the drive plate facing for wear and damage.• Check the driven plate for discoloration (burnt color).• Check for worn snap ring, fatigue or damaged return spring ...

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