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


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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) CONTROL MODULE].)
POSSIBLE CAUSE
•  Battery and/or generator malfunction
•  EPAS 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?
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.
2
INSPECT BATTERY GRAVITY
•  Is the battery specific gravity as specified?
Yes
Go to the next step.
No
Replace the battery, then go to Step 7.
3
INSPECT CHARGING SYSTEM
Yes
Go to the next step.
No
Replace the generator and/or drive belt if necessary.
Go to Step 7.
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 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 7.
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 THAT THE SAME DTC IS NOT PRESENT
•  Make sure to reconnect all disconnected connectors.
•  Using the M-MDS, clear the DTC from the EPS control module.
•  Using the M-MDS, perform the EPS control module DTC inspection.
•  Is the same Pending DTC present?
Yes
Replace the steering column, then go to the next step.
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.
No
DTC troubleshooting completed.