DTC U0401:68 [FRONT BODY CONTROL MODULE (FBCM)]
id0902p2010600
System malfunction location |
Error signal received from PCM |
---|---|
Detection condition
|
• The front body control module (FBCM) receives error ECT sensor or ambient temperature sensor signals from the PCM for 5 s or more with the ignition switched ON (engine off or on).
|
Fail-safe
|
—
|
Possible cause
|
• ECT sensor malfunction
• Ambient temperature sensor malfunction
• PCM malfunction
• Front body control module (FBCM) malfunction
|
System wiring diagram
|
—
|
Diagnostic Procedure
Step |
Inspection |
Action |
|
---|---|---|---|
1
|
VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN
• Clear front body control module (FBCM) DTCs using the M-MDS.
• Switch the ignition ON (engine off or on) and wait for 5 s or more.
• Perform the front body control module (FBCM) DTC inspection using the M-MDS.
• Is DTC U0401:68 displayed?
|
Yes
|
Go to the next step.
|
No
|
Go to Step 6.
|
||
2
|
INSPECT ECT SENSOR
• Inspect the ECT sensor.
• Is the ECT sensor normal?
|
Yes
|
Go to the next step.
|
No
|
Replace the ECT sensor, then go to Step 5.
|
||
3
|
INSPECT AMBIENT TEMPERATURE SENSOR
• Inspect the ambient temperature sensor.
• Is the ambient temperature sensor normal?
|
Yes
|
Go to the next step.
|
No
|
Replace the ambient temperature sensor, then go to Step 5.
|
||
4
|
PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS PCM
• Clear front body control module (FBCM) DTCs using the M-MDS.
• Switch the ignition ON (engine off or on) and wait for 5 s or more.
• Perform the front body control module (FBCM) DTC inspection using the M-MDS.
• Is DTC U0401:68 displayed?
|
Yes
|
Replace the PCM, then go to the next step.
|
No
|
Go to Step 6.
|
||
5
|
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
• Clear front body control module (FBCM) DTCs using the M-MDS.
• Switch the ignition ON (engine off or on) and wait for 5 s or more.
• Perform the front body control module (FBCM) DTC inspection using the M-MDS.
• Is DTC U0401:68 displayed?
|
Yes
|
replace the front body control module (FBCM), then go to the next step.
|
No
|
Go to the next step.
|
||
6
|
VERIFY IF OTHER DTCs DISPLAYED
• Are any other DTCs displayed?
|
Yes
|
Repair the malfunctioning part according to the applicable DTC troubleshooting.
|
No
|
DTC troubleshooting completed.
|