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

Subaru Crosstrek Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc u0401 invalid data received from ecm/pcm a

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 procedures. Basic Diagnostic Procedure">

1. OUTLINE OF DIAGNOSIS

• Detect malfunction of CAN communication.

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

2. EXECUTION CONDITION

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

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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