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DTC U0423:68 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

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2016 – MX-5 – HVAC

DTC U0423:68 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

System malfunction location

  • Invalid data received from instrument cluster

Detection condition

  • The climate control unit receives error signals from the Instrument cluster for 5s or more

Fail-safe function

Not applicable

Possible cause

  • Instrument cluster malfunction

  • Climate control unit malfunction

System wiring diagram

Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

PERFORM INSTRUMENT CLUSTER DTC INSPECTION

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

No

Go to the next step.

2

PERFORM CLIMATE CONTROL UNIT DTC INSPECTION

Yes

Replace the instrument cluster, then go to the next step.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

Go to the next step.

3

VERIFY TROUBLESHOOTING COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

4

VERIFY THAT NO OTHER DTCs ARE PRESENT

Yes

Perform the corresponding DTC inspection.

(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

No

DTC troubleshooting completed.

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