DTC U3003:16/U3003:17/U3003:1E [DSC HU/CM]


id040262848800

DTC
U3003:16
Power supply
U3003:17
U3003:1E
DETECTION CONDITION
•  Power supply malfunction is detected.
FAIL-SAFE FUNCTION
•  Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
POSSIBLE CAUSE
•  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

Diagnostic Procedure

Step

Inspection

Action

1
VERIFY PCM DTC
•  Using the M-MDS, perform the PCM DTC inspection.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
DTC troubleshooting completed, then go to the next step.
No
Go to the next step.
2
INSPECT BATTERY
•  Inspect the battery.
•  Is there any malfunction?
Yes
Charge or replace the battery, then go to Step7.
No
Go to the next step.
3
INSPECT GENERATOR
•  Is there any malfunction?
Yes
Replace the generator, then go to Step7.
No
Go to the next step.
4
INSPECT FUSE CONDITION
•  Is the fuse (SRS1 7.5A, ABS/DSC S 30A, ABS/DSC M 50A) normal?
Yes
Go to the next step.
No
•  If the fuse is blown:
?  Refer to the wiring diagram and verify whether or not there is a common connector between fuse and DSC HU/CM terminal I, A and 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 a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
•  Replace the fuse.
•  If the fuse is damaged:
?  Replace the fuse.
Go to Step7.
5
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:
?  DSC HU/CM terminal I (wiring harness-side)—body ground
?  DSC HU/CM terminal A (wiring harness-side)—body ground
?  DSC HU/CM terminal B (wiring harness-side)—body ground
•  Is the voltage 10 V or more?
Yes
Go to the next Step.
No
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.
6
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?
Yes
Go to the next step.
No
•  If the open circuit could be detected in the wiring harness:
?  Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AK and body ground.
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 the next step.
•  If the resistance is out of specification:
?  Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AK and body ground.
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 and a poor ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit and a poor ground.
?  Go to the next step.
7
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Using the M-MDS, clear the DTC from the DSC HU/CM.
•  Using the M-MDS, perform the DSC HU/CM DTC inspection.
•  Is the same DTC present?
Yes
Repeat the inspection from Step1.
If the malfunction recurs, replace the DSC HU/CM, then go to the next step.
No
Go to the next step.
8
VERIFY NO DTC IS PRESENT
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.