DTC U0402:68 [ELECTRONIC 4WD CONTROL SYSTEM]
id0302a6201300
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DTC U0402:68 |
Signal error from TCM |
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DETECTION CONDITION
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• The instrument cluster received error signals from the transaxle for 5 s with the ignition switched ON (engine off or on).
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FAIL-SAFE FUNCTION
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• Refer to “Fail-safe function table”. (See DTC TABLE [ELECTRONIC 4WD CONTROL SYSTEM].)
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POSSIBLE CAUSE
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• The transaxle could not send a normal signal temporarily. (DTCs are stored in the TCM.)
• TCM malfunction
• Instrument cluster malfunction
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SYSTEM WIRING DIAGRAM
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Not applicable
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Diagnostic Procedure
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STEP |
INSPECTION |
ACTION |
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1
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VERIFY TCM DTC
• Using the M-MDS, perform the TCM DTC inspection.
• Are any DTCs present?
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Yes
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Go to applicable DTC inspection.
DTC troubleshooting completed, then go to the next step.
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No
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Go to the next step.
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2
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DRIVE VEHICLE THEN VERIFY TCM DTC AGAIN
• Drive the vehicle at a vehicle speed of 30 km/h {19 mph} or more for 100 s or more.
• Using the M-MDS, perform the TCM DTC inspection.
• Are any DTCs present?
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Yes
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Go to applicable DTC inspection.
DTC troubleshooting completed, then go to the next step.
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No
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Go to the next step.
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3
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VERIFY INSTRUMENT CLUSTER DTC
• Using the M-MDS, perform the instrument cluster DTC inspection.
• Are any DTCs present?
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Yes
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Go to applicable DTC inspection.
DTC troubleshooting completed, then go to the next step.
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No
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Go to the next step.
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4
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VERIFY DTC TROUBLESHOOTING COMPLETED
• Using the M-MDS, clear the DTC from the 4WD control module.
• Using the M-MDS, perform the 4WD control module DTC inspection.
• Is the same DTC present?
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Yes
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Replace the 4WD control module, then go to the next step.
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No
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Go to the next step.
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5
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VERIFY NO DTC IS PRESENT
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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DTC troubleshooting completed.
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