DTC U3003:16, U3003:17 OR U3003:1C [ELECTRIC POWER STEERING (EPS) CONTROL MODULE]

id0602a6015400

Outline

System malfunction location		Battery power supply
Detection condition		•  U3003:16 ―  Voltage of 8 V or less detected by Electric Power Steering (EPS) control module internal battery voltage observation. •  U3003:17 or U3003:1C ―  Voltage of 17.5 V or more detected by Electric Power Steering (EPS) control module internal battery voltage observation.
Fail-safe		•  Refer to “Fail-safe Function Table”. (See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)
Possible cause		•  DTCs are stored in the following modules. ―  PCM ―  DC-DC converter •  Lead-acid battery malfunction •  Electric Power Steering (EPS) control module connector or terminal malfunction •  Short to ground or open circuit in Electric Power Steering (EPS) control module power supply circuit •  Open circuit in Electric Power Steering (EPS) control module ground circuit •  Electric Power Steering (EPS) control module malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY DTCs •  Perform the DTC inspection for the following modules. (See DTC INSPECTION.) ―  PCM ―  DC-DC converter •  Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (e-SKYACTIV)].) (See DTC TABLE [DC-DC CONVERTER (e-SKYACTIV)].)
		No	Go to the next step.
2	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	Repair or replace the malfunctioning location and perform the repair completion verification. (See LEAD-ACID BATTERY RECHARGING.) (See LEAD-ACID BATTERY REMOVAL/INSTALLATION.)
3	INSPECT ELECTRIC POWER STEERING (EPS) CONTROL MODULE CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (See CLEARING DTC.) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT ELECTRIC POWER STEERING (EPS) CONTROL MODULE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT •  Inspect the power supply circuit for an open circuit and short to ground. (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.
5	INSPECT ELECTRIC POWER STEERING (EPS) CONTROL MODULE GROUND CIRCUIT FOR POOR GROUND AND OPEN CIRCUIT •  Inspect the ground circuit for an 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.
Repair completion verification 1	VERIFY DTC TROUBLESHOOTING COMPLETED •  Using the M-MDS, clear the DTC from the Electric Power Steering (EPS) control module. (See CLEARING DTC.) •  Using the M-MDS, perform the Electric Power Steering (EPS) control module DTC inspection. (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 Electric Power Steering (EPS) control module. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.) Go to the next step.
		No	Go to the next step.
Repair completion verification 2	VERIFY NO DTC IS PRESENT •  Are any DTCs present?	Yes	Go to applicable DTC inspection. (See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)
		No	DTC troubleshooting completed.