DTC U3000:49 [START STOP UNIT]

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2014 - Mazda6 - Body and Accessories

DTC U3000:49 [START STOP UNIT]

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 having performed 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 System Inspection Required” is displayed in the LCD (Instrument cluster (type A))/the 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.


Description	Start stop unit internal malfunction
Detection condition	Start stop unit detects the internal malfunction.
Fail-safe function	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	Not applicable

Diagnostic Procedure


Step	Inspection		Action
1	PERFORM DTC INSPECTION AND VERIFY START STOP UNIT MALFUNCTION Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.) Go to the next step.
1		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].)
2		No	DTC troubleshooting completed.

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