DTC U0402:68 [ELECTRONIC 4WD CONTROL SYSTEM]

id0302a6201300

DTC U0402:68

Error signal received from transaxle
DETECTION CONDITION
•  The 4WD control module received error signals from the transaxle for 1 s or more with the ignition switched ON (engine off or on).
FAIL-SAFE FUNCTION
•  4WD operates by the specified data.
POSSIBLE CAUSE
•  The transaxle could not send a normal signal temporarily. (DTCs are stored in the TCM.)
•  Transaxle malfunction
•  4WD control module malfunction
SYSTEM WIRING DIAGRAM
Not applicable


Diagnostic Procedure

Step

Inspection

Results

Action
1
VERIFY DTCs FOR TCM
•  Verify DTCs for the TCM using the M-MDS.
•  Is the DTC displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (FW6A-EL, FW6AX-EL)].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (GW6A-EL, GW6AX-EL)].)
No
Go to the next step.
2
DRIVE VEHICLE THEN VERIFY DTCs FOR TCM AGAIN
•  Drive the vehicle at a vehicle speed of 30 km/h {19 mph} or more for 100 s or more.
•  Verify DTCs for the TCM using the M-MDS.
•  Is the DTC displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (FW6A-EL, FW6AX-EL)].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (GW6A-EL, GW6AX-EL)].)
No
Go to the next step.
3
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Clear DTC for the 4WD control module using the M-MDS.
•  Switch the ignition ON and wait for 20 s or more.
•  Perform the DTC inspection for the 4WD control module using the M-MDS.
•  Is DTC U0402:68 displayed?
Yes
Replace the 4WD control module, then go to the next step.
(See 4WD CONTROL MODULE REMOVAL/INSTALLATION.)
No
Go to the next step.
4
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ELECTRONIC 4WD CONTROL SYSTEM].)
No
DTC troubleshooting completed.