DTC U3003:16 [ELECTRIC POWER STEERING (EPS)]
id0602a1812800
DTC U3003:16
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Battery power supply
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DETECTION CONDITION
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• Voltage of 8 V or less detected by EPS control module internal ignition voltage observation.
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FAIL-SAFE FUNCTION
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• Refer to “Fail-safe Function Table”. (See DTC TABLE [ELECTRIC POWER STEERING (EPS)].)
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POSSIBLE CAUSE
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• 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
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Diagnostic Procedure
Step |
Inspection |
Action |
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1
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INSPECT BATTERY VOLTAGE
• Is the battery terminal voltage normal?
(See BATTERY INSPECTION.)
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Yes
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Make sure that battery terminal connection is okay.
Go to the next step.
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No
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Charge or replace the battery, then go to Step 7.
(See BATTERY RECHARGING.)
(See BATTERY REMOVAL/INSTALLATION.)
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2
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INSPECT BATTERY GRAVITY
• Is the battery specific gravity as specified?
(See BATTERY INSPECTION.)
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Yes
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Go to the next step.
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No
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Replace the battery, then go to Step 7.
(See BATTERY REMOVAL/INSTALLATION.)
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3
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INSPECT CHARGING SYSTEM
• Are the generator and drive belt tension normal?
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Yes
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Go to the next step.
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No
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Replace the generator and/or drive belt if necessary.
Go to Step 7.
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4
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INSPECT FUSE CONDITION
• Is the fuse (EPAS 60A) normal?
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Yes
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Go to the next step.
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No
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Replace the fuse, then go to Step 7.
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5
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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.
• Is the voltage 8 V or more?
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Yes
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Go to the next Step.
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No
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Repair or replace the wiring harness (including fuse) between the EPS control module and ground, then go to Step 7.
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6
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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?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness between terminal 1A and body ground, then go to the next step.
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7
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VERIFY DTC TROUBLESHOOTING COMPLETED
• 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 DTC present?
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Yes
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Repeat the inspection from Step1.
If the malfunction recurs, replace the EPS control module, then go to the next step.
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No
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Go to the next step.
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8
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VERIFY NO DTC IS PRESENT
• Are any DTCs present?
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Yes
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Go to applicable DTC inspection.
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No
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DTC troubleshooting completed.
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