DTC U0401:68 [REAR VEHICLE MONITORING SYSTEM]

id0902z2885600

DESCRIPTION

Erratic signal from PCM
DETECTION CONDITION
•  Rear vehicle monitoring control module (RH) receives erratic signal from PCM for 1 s or more.
POSSIBLE CAUSE
•  PCM malfunction
•  Rear vehicle monitoring control module (RH) malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
CONFIRM PCM DTC
•  Switch the ignition to off.
•  Connect the M-MDS to the DLC-2.
•  Perform the DTC Reading Procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [ZY, Z6].)
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO5 emission level)].)
(See DTC TABLE [LF, L5].)
(See DTC TABLE [MZR 2.0 DISI i-stop].)
(See DTC TABLE [MZR-CD 2.2].)
(See DTC TABLE [L3 Turbo].)
No
Go to the next step.
2
VERIFY PCM MALFUNCTION
•  Clear the DTC using the M-MDS.
•  Switch the ignition to ON and wait for 1.5 s or more.
•  Perform the DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [ZY, Z6].)
(See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6) (EURO5 emission level)].)
(See PCM REMOVAL/INSTALLATION [LF, L5].)
(See PCM REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
(See PCM REMOVAL/INSTALLATION [MZR-CD 2.2].)
(See PCM REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to Step 4.
3
VERIFY TROUBLESHOOTING COMPLETED
•  Clear the DTC using the M-MDS.
•  Switch the ignition to ON and wait for 1.5 s or more.
•  Perform the DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Replace the rear vehicle monitoring control module (RH), then go to the next step.
(See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
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.
(See DTC TABLE [REAR VEHICLE MONITORING SYSTEM].)
No
DTC troubleshooting completed.