DTC U0401:68 [INSTRUMENT CLUSTER]SM2445868
DTC U0401:68 [INSTRUMENT CLUSTER]

id0902e8988800

DESCRIPTION

Erratic signal from PCM

DETECTION CONDITION
• Instrument cluster receives the erratic data from PCM when the ignition switch is ON.
POSSIBLE CAUSE
• PCM DTC is stored
• PCM malfunction
• Instrument cluster malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
CONFIRM PCM DTC
• Perform the DTC inspection to confirm the PCM DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L5].) (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].) (See ON-BOARD DIAGNOSTIC TEST [MZR-CD 2.2].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Go to the next step.
2
CONFIRM INSTRUMENT CLUSTER DTC
• Clear the DTC from the instrument cluster using the M-MDS. (See CLEARING DTC [INSTRUMENT CLUSTER].)
• Turn the ignition switch to the ON position and wait for 20 s or more.
• Drive the vehicle at speed of 30 km/h {19 mph} or more.
• Perform the “DTC INSPECTION” to confirm the instrument cluster DTC using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].)
• 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 DTC from the instrument cluster using the M-MDS. (See CLEARING DTC [INSTRUMENT CLUSTER].)
• Turn the ignition switch to the ON position and wait for 20 s or more.
• Drive the vehicle at speed of 30 km/h {19 mph} or more.
• Perform the “DTC INSPECTION” to confirm the instrument cluster DTC using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].)
• Is the same DTC present?
Yes
Replace the instrument cluster, 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.