DTC U0401:68 [ADVANCED KEYLESS AND START SYSTEM]


id0902e1399300


Description

•  Correct data cannot be received from PCM

Possible Causes

•  PCM malfunction
•  Keyless control module malfunction

Diagnostic Procedure

Step

Inspection

Action

1
VERIFY PCM DTCs
•  Perform the PCM DTC inspection using the M-MDS.
(See MZ-CD 1.6.)
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See MZ-CD 1.6.)
No
Go to the next step.
2
PERFORM DTC INSPECTION AND VERIFY THAT MALFUNCTIONING PART IS PCM
•  Clear the DTCs using the M-MDS.
•  Perform the keyless control module DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to Step 4.
3
VERIFY TROUBLESHOOTING COMPLETED
•  Clear the DTCs using the M-MDS.
•  Perform the keyless control module DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Replace the keyless control module, then go to the next step.
No
Go to the next step.
4
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.