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 CM internal ignition voltage observation.
FAIL-SAFE FUNCTION	•  Control is maintained by gradually decreasing the motor control current ―  However, control is inhibited if the power supply voltage is the specified value of less. •  Power steering malfunction indication: Illuminated/Indicated
POSSIBLE CAUSE	•  Battery and/or generator malfunction •  EPAS 60A fuse malfunction •  Open or short circuit in the wiring harness between EPS CM terminal 1B and battery •  Open circuit in the wiring harness between EPS CM terminal 1A and body ground
SYSTEM WIRING DIAGRAM

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT BATTERY VOLTAGE •  Is the battery terminal voltage normal? (See BATTERY INSPECTION.)	Yes	Make sure that battery terminal connection is okay. Go to the next step.
		No	Charge or replace the battery, then go to Step 7. (See BATTERY RECHARGING.) (See BATTERY REMOVAL/INSTALLATION [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.)	Yes	Go to the next step.
		No	Replace the battery, then go to Step 7. (See BATTERY REMOVAL/INSTALLATION [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 GENERATOR INSPECTION [SKYACTIV-G 2.5].) (See DRIVE BELT INSPECTION [SKYACTIV-G 2.5].) (See GENERATOR INSPECTION [SKYACTIV-D 2.2].) (See DRIVE BELT INSPECTION [SKYACTIV-D 2.2].)	Yes	Go to the next step.
		No	Replace the generator and/or drive belt if necessary. Go to Step 7. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
4	INSPECT FUSE CONDITION •  Is the fuse (EPAS 60A) normal?	Yes	Go to the next step.
		No	Replace the fuse, then go to Step 7.
5	INSPECT EPS CM POWER SUPPLY CIRCUIT FOR OPEN OR SHORT CIRCUIT •  Switch the ignition ON (engine off). •  Measure the voltage between the EPS CM terminal 1B (wiring harness-side) and body 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 CM terminal 1B and body ground, then go to Step 7.
6	INSPECT EPS CM GROUND CIRCUIT FOR POOR GROUND OR OPEN CIRCUIT •  Switch the ignition off. •  Inspect for continuity between EPS CM terminal 1A and body ground. •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between EPS CM terminal 1A and body ground, then go to the next step.
7	VERIFY THAT THE SAME DTC IS NOT PRESENT •  Make sure to reconnect all disconnected connectors. •  Clear the DTC from the memory. (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS [ELECTRIC POWER STEERING (EPS)].) •  Is the same Pending DTC present? (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS [ELECTRIC POWER STEERING (EPS)].)	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the EPS CM, then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
		No	Go to the next step.
8	VERIFY THAT NO OTHER DTCS ARE PRESENT •  Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS [ELECTRIC POWER STEERING (EPS)].)
		No	DTC troubleshooting completed.