DTC U0401:68 [REAR VEHICLE MONITORING SYSTEM]

id0902z2885600

Malfunction location

• Signal error from PCM

Detection condition

• Correct data cannot be received from PCM

Possible Causes

• PCM malfunction

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT FOR PCM MALFUNCTION

•  Switch the ignition to off (LOCK).

•  Connect the M-MDS to the DLC-2.

•  Perform the PCM DTC inspection using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR-CD 2.2].)

•  Is the DTC displayed?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR-CD 2.2].)

No

Go to the next step.

2

VERIFY CORRECTION COMPLETED

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].)

•  Perform the rear vehicle monitoring control module DTC inspection.
(See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].)

•  Is DTC U0401:68 displayed?

Yes

Replace the PCM.

(See PCM REMOVAL/INSTALLATION [MZR-CD 2.2].)

No

Go to the next step.

3

VERIFY THAT NO OTHER DTCs ARE RECORDED

•  Are any other DTCs displayed?

Yes

Perform the corresponding DTC inspection.

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT FOR PCM MALFUNCTION • Switch the ignition to off (LOCK). • Connect the M-MDS to the DLC-2. • Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR-CD 2.2].) • Is the DTC displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD 2.2].)
1		No	Go to the next step.
2	VERIFY CORRECTION COMPLETED • Clear DTCs using the M-MDS. (See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].) • Perform the rear vehicle monitoring control module DTC inspection. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].) • Is DTC U0401:68 displayed?	Yes	Replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR-CD 2.2].)
2		No	Go to the next step.
3	VERIFY THAT NO OTHER DTCs ARE RECORDED • Are any other DTCs displayed?	Yes	Perform the corresponding DTC inspection.
3		No	DTC troubleshooting completed.