DTC U0401:00 [FS5A-EL]SM2445246
DTC U0401:00 [FS5A-EL]

id050221300500

DTC U0401:00

Invalid data received from PCM
DETECTION CONDITION
• Irregular input signals input from the PCM.
Diagnostic support note:
• The MIL does not illuminate.
• The AT warning light does not illuminate.
• PENDING CODE is not available.
• FREEZE FRAME DATA is not available.
• The DTC is stored in the TCM memory.
POSSIBLE CAUSE
• PCM malfunction
• TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
VERIFY DTC HAVE BEEN PRESENTED
• Turn the ignition switch off, then to the ON position (engine off).
• Read the DTC in the PCM.
• Are any DTCs stored?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L5].)
No
Go to the next step.
3
VERIFY TROUBLESHOOTING OF DTC U0401:00 COMPLETED
• Make sure to reconnect all the disconnected connectors.
• Clear the DTC using the M-MDS.
• Perform the following procedure to ensure that the DTC has been resolved:
1. Start the engine.
2. Warm up the engine to normal operating temperature.
3. Drive the vehicle in D range for 1 s or more.
• Is the same DTC present?
Yes
Replace the TCM, then go to the next step.
(See TCM REMOVAL/INSTALLATION [FS5A-EL].)
No
Go to the next step.
4
VERIFY NO DTC HAS BEEN PRESENTED
• Perform the “Reading DTCs Procedure”. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FS5A-EL].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FS5A-EL].)
No
DTC troubleshooting completed.