DTC U3000-49; Start Stop Unit Internal Malfunction: Notes
WARNING: This page is about a different car, the 2017 Mazda 3. 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 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.
DETECTION CONDITION & POSSIBLE CAUSE
| Description | Start stop unit internal malfunction |
| Detection condition |
|
| Fail-safe |
|
| Possible cause |
|
| System wiring diagram | Not applicable |