Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc u0401 invalid data received from ecm/pcm "a"

Subaru Legacy BN/BS (2015-2019) Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / 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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Other materials:

Removal
1. Remove the transmission assembly. Automatic Transmission Assembly > REMOVAL2. Remove the torque converter assembly. Torque Converter Assembly > REMOVAL3. Remove the oil pump chain cover. Oil Pump Chain > REMOVAL4. Remove the oil pump and the plate.5. Remove the O-rings. ...