DTC U3003:17 [DC-DC CONVERTER (e-SKYACTIV)]

System malfunction location	Lead-acid battery charging circuit voltage: High input
Detection condition	• The DC-DC converter detects that the voltage value in the lead-acid battery charging circuit is at or above the specified value for 0.1 s.
Fail-safe	• Stops output from the DC-DC converter.
Possible cause	• DC-DC converter connector or terminals malfunction • Short to power supply in lead-acid battery charge circuit • Open circuit in DC-DC converter ground circuit • Lead-acid battery malfunction • DC-DC converter malfunction

System malfunction location

Lead-acid battery charging circuit voltage: High input

Detection condition

• The DC-DC converter detects that the voltage value in the lead-acid battery charging circuit is at or above the specified value for 0.1 s.

Fail-safe

• Stops output from the DC-DC converter.

Possible cause

• DC-DC converter connector or terminals malfunction

• Short to power supply in lead-acid battery charge circuit

• Open circuit in DC-DC converter ground circuit

• Lead-acid battery malfunction

• DC-DC converter malfunction

<<High voltage>>

• If necessary measures such as wearing the correct protective gear are not taken when inspecting or removing/installing the high voltage parts, it could cause electrical shock and result in serious injury or, in the worst case, death.

• Before inspecting or removing/installing the high voltage parts, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and [High Voltage Part Inspection and Removal/Installation Notes] of the high voltage system service cautions and implement the necessary measures and preparations. (See HIGH VOLTAGE SERVICE CAUTIONS.) (See HIGH VOLTAGE SYSTEM SERVICE CAUTIONS.)

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	INSPECT DC-DC CONVERTER LEAD-ACID BATTERY CHARGE CIRCUIT TERMINAL FOR MALFUNCTION • Inspect the applicable terminal. (See CONNECTOR INSPECTION.) • Is the terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
3	INSPECT DC-DC CONVERTER LEAD-ACID BATTERY CHARGE CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
4	INSPECT DC-DC CONVERTER GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
5	INSPECT LEAD-ACID BATTERY FOR MALFUNCTION • Inspect the applicable part. (See LEAD-ACID BATTERY INSPECTION.) • Is the part normal?	Yes	Go to the next step.
No	Recharge or replace the lead-acid battery and perform the repair completion verification 1. (See LEAD-ACID BATTERY RECHARGING.) (See LEAD-ACID BATTERY REMOVAL/INSTALLATION.)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Warning <<High voltage>> • Wear insulated gloves when working on a high voltage system. • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Warning • While performing this step, always operate the vehicle in a safe and lawful manner. • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. ― Drive the vehicle under the snapshot data condition for 0.1 s or more. • Perform the DTC inspection for the DC-DC converter. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the DC-DC converter, then go to the next step. (See DC-DC CONVERTER REMOVAL/INSTALLATION.)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

• Record the snapshot data.

Note

• Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

INSPECT DC-DC CONVERTER LEAD-ACID BATTERY CHARGE CIRCUIT TERMINAL FOR MALFUNCTION

• Inspect the applicable terminal.

(See CONNECTOR INSPECTION.)

• Is the terminal normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification 1.

INSPECT DC-DC CONVERTER LEAD-ACID BATTERY CHARGE CIRCUIT FOR SHORT TO POWER SUPPLY

• Inspect the applicable circuit for a short to power supply.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification 1.

INSPECT DC-DC CONVERTER GROUND CIRCUIT FOR OPEN CIRCUIT

• Inspect the applicable circuit for open circuit.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification 1.

INSPECT LEAD-ACID BATTERY FOR MALFUNCTION

• Inspect the applicable part.

(See LEAD-ACID BATTERY INSPECTION.)

• Is the part normal?

Yes

Go to the next step.

Recharge or replace the lead-acid battery and perform the repair completion verification 1.

(See LEAD-ACID BATTERY RECHARGING.)

(See LEAD-ACID BATTERY REMOVAL/INSTALLATION.)

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

Warning

<<High voltage>>

• Wear insulated gloves when working on a high voltage system.

• Install/connect the part removed/disconnected during the troubleshooting procedure.

• Clear the DTC recorded in the memory.

(See CLEARING DTC.)

• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.

Warning

• While performing this step, always operate the vehicle in a safe and lawful manner.

• When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

― Drive the vehicle under the snapshot data condition for 0.1 s or more.

• Perform the DTC inspection for the DC-DC converter.

(See DTC INSPECTION.)

• Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

• If the malfunction recurs, replace the DC-DC converter, then go to the next step.

(See DC-DC CONVERTER REMOVAL/INSTALLATION.)

Go to the next step.