DTC U0401:00/U0401:86 [EVP CONTROL UNIT]

id040251840800

DTC
U0401:00
CAN communication: signal error from PCM
U0401:86
DETECTION CONDITION
•  DTC U0401:00
―  Vacuum sensor 2 signal from the PCM is invalid or not within range for a continuous 1 s.
•  DTC U0401:86
―  Engine speed signal error from the PCM continues for 5 s.
FAIL-SAFE FUNCTION
•  Refer to “Fail-safe function table”. (See DTC TABLE [EVP CONTROL UNIT].)
POSSIBLE CAUSE
•  PCM malfunction
SYSTEM WIRING DIAGRAM
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Diagnostic Procedure

Step

Inspection

Action
1
VERIFY PCM DTC
•  Using the M-MDS, perform the PCM DTC inspection.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].)
DTC troubleshooting completed, then go to the next step.
No
Go to the next step.
2
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Using the M-MDS, clear the DTC from the EVP control unit.
•  Using the M-MDS, perform the EVP control unit DTC inspection.
•  Is the same Pending DTC present?
Yes
Repeat the inspection from Step1.
If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0].)
No
Go to the next step.
3
VERIFY NO DTC IS PRESENT
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [EVP CONTROL UNIT].)
No
DTC troubleshooting completed.