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2014 - Mazda6 - Body and Accessories

DTC U0402:68 [INSTRUMENT CLUSTER]



Description

Error signal received from transmission/transaxle

Detection condition

  • Instrument cluster received the error signals from the transmission/transaxle for 1 s or more with the ignition switched ON (engine off or on).

Fail-safe function

Not applicable

Possible cause

  • The transaxle could not send a normal signal temporarily. (DTCs are stored in the TCM.)

  • TCM malfunction

  • Instrument cluster malfunction

System wiring diagram

Not applicable


Diagnostic Procedure



Step

Inspection

Action

1

VERIFY TCM DTCs

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)

No

Go to the next step.

2

DRIVE VEHICLE THEN VERIFY DTCs FOR TCM AGAIN

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)

No

Go to the next step.

3

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

4

VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [INSTRUMENT CLUSTER].)

No

DTC troubleshooting completed.




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