DTC U0401:00

CAN system communication error

DETECTION CONDITION

• Error detected in signal from PCM via CAN communication

FAIL-SAFE FUNCTION

• Vehicle speed signal malfunction

• Control is maintained by gradually changing the controlled vehicle speed and setting it to 120 km/h {74.6 mph}

• Power steering malfunction indicator light: Illuminated

• Engine speed signal malfunction

• Control enabled

• Power steering malfunction indicator light: Not illuminated

• i-stop status signal malfunction

• EPS i-stop control is not operated, and normal control is maintained

• Power steering malfunction indicator light: Not illuminated

POSSIBLE CAUSE

• PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable

Step

Inspection

Action

1

• Using the M-MDS, perform the DTC inspection for the PCM.

  (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].)

• Are any DTCs detected?

Yes

Go to applicable DTC inspection.

(See DTC TABLE [SKYACTIV-G 2.5].)

DTC troubleshooting completed, then go to the next step.

No

Go to the next step.

2

• Clear the DTC from the memory.

  (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS.)

• Is the same DTC present?

  (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS.)

Yes

Repeat the inspection from Step 1.

If the malfunction recurs, replace the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)

No

DTC troubleshooting completed.