Honda Civic manuals

Subaru Legacy Service Manual: Dtc u0401 invalid data received from ecm/pcm "a"

NOTE:

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. Basic Diagnostic Procedure

1. OUTLINE OF DIAGNOSIS (ENGINE TYPE FB)

Detect malfunction of CAN communication.

Judge as NG when data received from ECM is not normal.

2. EXECUTION CONDITION (ENGINE TYPE FB)

Secondary Parameters

Execution condition

12 V battery system voltage

≥ 10 V

Measured turbine shaft speed

> 0 rpm

or

Transmission range

Drive or Reverse

3. DIAGNOSTIC METHOD (ENGINE TYPE FB)

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

CAN data from ECM

Did not change

Time Needed for Diagnosis: 2 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

4. OUTLINE OF DIAGNOSIS (ENGINE TYPE EZ)

Detect malfunction of CAN communication.

Judge as NG when data received from ECM is not normal.

5. EXECUTION CONDITION (ENGINE TYPE EZ)

Secondary Parameters

Execution condition

12 V battery system voltage

≥ 10 V

Measured primary pulley shaft speed

> 0 rpm

or

Transmission range

Drive or Reverse

6. DIAGNOSTIC METHOD (ENGINE TYPE EZ)

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

CAN data from ECM

Did not change

Time Needed for Diagnosis: 2 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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