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Home >> Mazda >> 2017 >> 5 GS, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> On-Board Diagnostic - Instrument Cluster >> DTC U0402-68: Signal Error From Pcm [Instrument Cluster] >> Diagnostic Procedure

Diagnostic Procedure

DTC U0402:68 (INSTRUMENT CLUSTER) DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 PERFORM TCM DTC INSPECTION Yes Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FS5A-EL] .)
No Go to the next step.
2 PERFORM DTC INSPECTION AND VERIFY THAT MALFUNCTIONING PART IS TCM Yes Replace the TCM, then go to the next step.
(See TCM REMOVAL/INSTALLATION [FS5A-EL] .)
No Go to Step 4.
3 VERIFY TROUBLESHOOTING COMPLETED Yes Replace the instrument cluster, then go to the next step.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
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.
(See DTC TABLE [INSTRUMENT CLUSTER] .)
No DTC troubleshooting completed.