DTC U3000:4B

DC-DC converter internal temperature malfunction

DETECTION CONDITION

• A condition in which the DC-DC converter internal temperature is abnormally high or low is detected.

FAIL-SAFE FUNCTION

• Not applicable

POSSIBLE CAUSE

• DC-DC converter malfunction

SYSTEM WIRING DIAGRAM

• Not applicable

STEP

INSPECTION

ACTION

1

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

• Clear the DTC for the DC-DC converter using the M-MDS.

  (See CLEARING DTC [i-ELOOP].)

• Switch the ignition off.

• Switch the ignition ON (engine off) and wait for 5 s or more.

• Retrieve the DC-DC converter DTCs using the M-MDS.

  (See DTC INSPECTION [i-ELOOP].)

• Is the same DTC present?

Yes

Replace the DC-DC converter, then go to the next step.

(See DC-DC CONVERTER REMOVAL/INSTALLATION [i-ELOOP].)

No

Go to the next step.

3

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [i-ELOOP].)

No

DTC troubleshooting completed.