DTC U3000:49 [START STOP UNIT]

2016 – MX-5 – Body and Accessories

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.

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 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	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.