Subaru Crosstrek Service Manual: 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.
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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