DTC

U3003:16

Power supply

U3003:17

U3003:1E

DETECTION CONDITION

• Power supply malfunction is detected.

FAIL-SAFE FUNCTION

• Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)

POSSIBLE CAUSE

• DTC is stored in PCM

• Battery malfunction

• Generator malfunction

• Fuse (SRS1 7.5A, ABS/DSC S 30A, ABS/DSC M 50A) malfunction

• Short to ground or open circuit in wiring harness between battery and DSC HU/CM terminal I

• Short to ground or open circuit in wiring harness between battery and DSC HU/CM terminal A

• Short to ground or open circuit in wiring harness between battery and DSC HU/CM terminal B

• Open circuit in wiring harness between DSC HU/CM terminal AK and body ground

• Poor connection at each connector

• DSC HU/CM malfunction

Step

Inspection

Action

1

• Using the M-MDS, perform the PCM DTC inspection.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

DTC troubleshooting completed, then go to the next step.

No

Go to the next step.

2

• Inspect the battery.

  (See BATTERY INSPECTION.)

• Is there any malfunction?

Yes

Charge or replace the battery, then go to Step7.

(See BATTERY RECHARGING.)

(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

3

• Inspect the generator.

  (See GENERATOR INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the generator, then go to Step7.

(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

4

• Is the fuse (SRS1 7.5A, ABS/DSC S 30A, ABS/DSC M 50A) normal?

Yes

Go to the next step.

No

• If the fuse is blown:

• Refer to the wiring diagram and verify whether or not there is a common connector between fuse and DSC HU/CM terminal I, A and B.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

• Replace the fuse.

• If the fuse is damaged:

• Replace the fuse.

Go to Step7.

5

• Switch the ignition OFF.

• Disconnect the DSC HU/CM connector.

• Switch the ignition ON (engine off).

• Measure the voltage as followings:

• DSC HU/CM terminal I (wiring harness-side)—body ground

• DSC HU/CM terminal A (wiring harness-side)—body ground

• DSC HU/CM terminal B (wiring harness-side)—body ground

• Is the voltage 10 V or more?

Yes

Go to the next Step.

No

Refer to the wiring diagram and verify whether or not there is a common connector in the followings.

• Battery—DSC HU/CM terminal I

• Battery—DSC HU/CM terminal A

• Battery—DSC HU/CM terminal B

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to Step7.

6

• Switch the ignition OFF.

• Disconnect the DSC HU/CM connector.

• Measure the resistance between DSC HU/CM terminal AK (wiring harness-side) and body ground.

• Is the resistance 0—1 ohm?

Yes

Go to the next step.

No

• If the open circuit could be detected in the wiring harness:

• Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AK and body ground.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

• Go to the next step.

• If the resistance is out of specification:

• Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AK and body ground.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a poor ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a poor ground.

• Go to the next step.

7

• Using the M-MDS, clear the DTC from the DSC HU/CM.

  (See CLEARING DTC [DSC HU/CM].)

• Using the M-MDS, perform the DSC HU/CM DTC inspection.

  (See DTC INSPECTION [DSC HU/CM].)

• Is the same DTC present?

Yes

Repeat the inspection from Step1

If the malfunction recurs, replace the DSC HU/CM, then go to the next step.

(See DSC HU/CM REMOVAL/INSTALLATION.)

No

Go to the next step.

8

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [DSC HU/CM].)

No

DTC troubleshooting completed.