DTC U3000-49: Start Stop Unit Internal Malfunction: Notes

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

If this DTC is detected, the system will enter the fail-safe function to ensure safety. If a specified period of time has elapsed or the vehicle has been driven for a specified period of time or more while in fail-safe mode, the ignition will remain stuck in off and the engine cannot be started. Therefore, perform the malfunction diagnosis while the engine can be started. In addition, after performing the malfunction diagnosis, verify that this DTC is not detected. 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 displays the warning indicator in the multi-information display (instrument cluster type A)/KEY warning indicator light (red) illuminates (instrument cluster type B) and the push button start indicator light (amber) flashes.
- Switch the ignition to ACC or ON (engine off or on).
- Depress the brake pedal (ATX)/clutch pedal (MTX).
In addition to the normal engine starting operation while cranking the engine in fail-safe mode, it is necessary to press the push button start.

System malfunction location	Start stop unit internal malfunction
Detection condition	Malfunction inside start stop unit detected.
Fail-safe	The system will enter the fail-safe function to ensure safety. If a specified period of time has elapsed or the vehicle has been driven for a specified period of time or more while in fail-safe mode, the ignition will remain stuck in off and the engine cannot be started.
Possible cause	Start stop unit internal malfunction
System wiring diagram	-