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DTC U0447:86 [START STOP UNIT]

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2016 – MX-5 – Body and Accessories

DTC U0447:86 [START STOP UNIT]

Description

Error signal received from BCM

Detection condition

  • Start stop unit receives the error signals from the BCM for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

  • Sets to default signal.

Possible cause

  • DTCs are stored in the BCM.

  • BCM malfunction

  • Start stop unit malfunction

System wiring diagram

Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY BCM DTCs

Yes

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

(See DTC TABLE [BCM].)

No

Go to the next step.

2

VERIFY IF MALFUNCTIONING LOCATION IS BCM DEPENDING ON REPEATABILITY

Yes

Replace the BCM, then go to the next step.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Go to Step 4.

3

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Replace the start stop unit, then go to the next step.

(See START STOP UNIT REMOVAL/INSTALLATION.)

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 [START STOP UNIT].)

No

DTC troubleshooting completed.

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