DTC U3003:16/U3003:17/U3003:1E [DSC HU/CM]
id040262848800
DTC
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U3003:16
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Power supply
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U3003:17
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U3003:1E
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DETECTION CONDITION
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• Power supply malfunction is detected.
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FAIL-SAFE FUNCTION
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• Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
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POSSIBLE CAUSE
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• DTC is stored in PCM
• Battery malfunction
• Generator malfunction
• Fuse (SRS1 7.5A, ABS/DSC S 30A, ABS/DSC M 50A) malfunction
• Short to ground or open circuit in wiring harness between battery and DSC HU/CM terminal I
• Short to ground or open circuit in wiring harness between battery and DSC HU/CM terminal A
• Short to ground or open circuit in wiring harness between battery and DSC HU/CM terminal B
• Open circuit in wiring harness between DSC HU/CM terminal AK and body ground
• Poor connection at each connector
• DSC HU/CM malfunction
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Diagnostic Procedure
Step |
Inspection |
Action |
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1
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VERIFY PCM DTC
• Using the M-MDS, perform the PCM DTC inspection.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
DTC troubleshooting completed, then go to the next step.
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No
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Go to the next step.
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2
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INSPECT BATTERY
• Inspect the battery.
(See BATTERY INSPECTION.)
• Is there any malfunction?
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Yes
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Charge or replace the battery, then go to Step7.
(See BATTERY RECHARGING.)
(See BATTERY REMOVAL/INSTALLATION.)
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No
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Go to the next step.
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3
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INSPECT GENERATOR
• Inspect the generator.
• Is there any malfunction?
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Yes
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Replace the generator, then go to Step7.
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No
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Go to the next step.
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4
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INSPECT FUSE CONDITION
• Is the fuse (SRS1 7.5A, ABS/DSC S 30A, ABS/DSC M 50A) normal?
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Yes
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Go to the next step.
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No
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• If the fuse is blown:
• If the fuse is damaged:
Go to Step7.
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5
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INSPECT DSC HU/CM POWER CIRCUIT FOR OPEN CIRCUIT
• Switch the ignition OFF.
• Disconnect the DSC HU/CM connector.
• Switch the ignition ON (engine off).
• Measure the voltage as followings:
• Is the voltage 10 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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Refer to the wiring diagram and verify whether or not there is a common connector in the followings.
• Battery—DSC HU/CM terminal I
• Battery—DSC HU/CM terminal A
• Battery—DSC HU/CM terminal B
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step7.
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6
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INSPECT DSC HU/CM GROUND CIRCUIT FOR OPEN CIRCUIT OR POOR GROUND
• Switch the ignition OFF.
• Disconnect the DSC HU/CM connector.
• Measure the resistance between DSC HU/CM terminal AK (wiring harness-side) and body ground.
• Is the resistance 0—1 ohm?
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Yes
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Go to the next step.
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No
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• If the open circuit could be detected in the wiring harness:
• If the resistance is out of specification:
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7
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VERIFY DTC TROUBLESHOOTING COMPLETED
• Using the M-MDS, clear the DTC from the DSC HU/CM.
(See CLEARING DTC [DSC HU/CM].)
• Using the M-MDS, perform the DSC HU/CM DTC inspection.
(See DTC INSPECTION [DSC HU/CM].)
• 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 DSC HU/CM, 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 the applicable DTC inspection.
(See DTC TABLE [DSC HU/CM].)
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No
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DTC troubleshooting completed.
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