DTC U3003:16 [ELECTRIC POWER STEERING (EPS)]

id0602a1812800

DTC U3003:16	Battery power supply
DETECTION CONDITION	•  Voltage of 8 V or less detected by EPS control module internal ignition voltage observation.
FAIL-SAFE FUNCTION	•  Refer to “Fail-safe Function Table”. (See DTC TABLE [ELECTRIC POWER STEERING (EPS)].)
POSSIBLE CAUSE	•  Battery and/or generator malfunction •  EPS 60A fuse malfunction •  Malfunction in the wiring harness between EPS control module terminal 1B and battery •  Open circuit in the wiring harness between EPS control module terminal 1A and body ground

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT BATTERY VOLTAGE •  Is the battery terminal voltage normal? (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY INSPECTION [SKYACTIV-D 2.2].)	Yes	Make sure that battery terminal connection is okay. Go to the next step.
		No	Charge or replace the battery, then go to Step 6. (See BATTERY RECHARGING [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY RECHARGING [SKYACTIV-D 2.2].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
2	INSPECT BATTERY GRAVITY •  Is the battery specific gravity as specified? (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY INSPECTION [SKYACTIV-D 2.2].)	Yes	Go to the next step.
		No	Replace the battery, then go to Step 6. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
3	INSPECT CHARGING SYSTEM •  Are the generator and drive belt tension normal? (See DRIVE BELT INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DRIVE BELT INSPECTION [SKYACTIV-D 2.2].) (See GENERATOR INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-ELOOP)].) (See GENERATOR INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITH i-ELOOP)].) (See GENERATOR INSPECTION [SKYACTIV-D 2.2 (WITHOUT i-ELOOP)].) (See GENERATOR INSPECTION [SKYACTIV-D 2.2 (WITH i-ELOOP)].)	Yes	Go to the next step.
		No	Replace the generator and/or drive belt if necessary. Go to step 6. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-ELOOP)].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITH i-ELOOP)].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2 (WITHOUT i-ELOOP)].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2 (WITH i-ELOOP)].) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
4	INSPECT FUSE CONDITION •  Is the fuse (EPS 60A) normal?	Yes	Go to the next step.
		No	Replace the fuse, then go to Step 7.
5	INSPECT EPS CONTROL MODULE POWER SUPPLY CIRCUIT FOR OPEN OR SHORT CIRCUIT •  Start the engine. •  Measure the voltage between following EPS control module terminal (wiring harness-side) and ground. ―  EPS control module: 1B—ground •  Is the voltage 8 V or more?	Yes	Go to the next Step.
		No	Repair or replace the wiring harness (including fuse) between the EPS control module and ground, then go to Step 6.
6	INSPECT EPS CONTROL MODULE GROUND CIRCUIT FOR POOR GROUND OR OPEN CIRCUIT •  Switch the ignition OFF. •  Inspect for continuity between EPS control module terminal 1A and body ground. •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between terminal 1A and body ground, then go to the next step.
7	VERIFY DTC TROUBLESHOOTING COMPLETED •  Using the M-MDS, clear the DTC from the EPS control module. (See CLEARING DTC [ELECTRIC POWER STEERING (EPS)].) •  Using the M-MDS, perform the EPS control module DTC inspection. (See DTC INSPECTION [ELECTRIC POWER STEERING (EPS)].) •  Is the same DTC present?	Yes	Repeat the inspection from Step1. If the malfunction recurs, replace the EPS control module, then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
		No	Go to the next step.
8	VERIFY NO DTC IS PRESENT •  Are any DTCs present?	Yes	Go to applicable DTC inspection. (See DTC TABLE [ELECTRIC POWER STEERING (EPS)].)
		No	DTC troubleshooting completed.