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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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DTC U3000:49 [START STOP UNIT]

WARNING:

  • If this DTC is detected, the system will enter the fail-safe function to ensure safety. If the ignition is switched OFF (LOCK) after a specified time has elapsed or the vehicle has been driven for a specified period of time or more while in the fail-safe mode, the ignition will remain switched off and the engine cannot be started. Therefore, perform the malfunction diagnosis while the engine can be started. In addition, after having performed the malfunction diagnosis, verify that this DTC is not detected with the steering wheel locked. If the DTC is not detected, the system returns to normal from the fail-safe function.

NOTE:

  • If the vehicle is in the following condition while in fail-safe mode, “Keyless Entry Malfunction” is displayed in the center display (with center display) and the KEY warning light (red) illuminates and the push button start indicator light (amber) flashes.

    • Switch the ignition to ACC or ON (engine off or on).

    • Depress the brake pedal (AT)/clutch pedal (MT).

  • In addition to the normal engine starting operation for cranking the engine in fail-safe mode, it is necessary to long-press the push button start until the engine starts.

Description

Start stop unit internal malfunction

Detection condition

  • Start stop unit detects the internal malfunction.

Fail-safe

  • The system will enter the fail-safe function to ensure safety. If the ignition is switched OFF (LOCK) after a specified time has elapsed or the vehicle has been driven for a specified period of time or more while in the fail-safe mode, the ignition will remain switched off and the engine cannot be started.

Possible cause

  • Start stop unit internal malfunction

System wiring diagram

Not applicable
Diagnostic Procedure

Step

Inspection

Action

1

 VERIFY IF MALFUNCTIONING LOCATION IS START STOP UNIT DEPENDING ON REPEATABILITY

Yes

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

(See START STOP UNIT REMOVAL/INSTALLATION.)

No

Go to the next step.

2

 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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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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