DTC U3003:08/U3003:16/U3003:17 [DSC HU/CM]

id040262902000

DTC
U3003:08
Battery power supply
U3003:16
U3003:17
DETECTION CONDITION
•  U3003:08
―  While the vehicle is traveling at a speed of 10km/h {6.2 mph} or more, a CAN signal error caused by low power supply voltage is detected
•  U3003:16
―  Low ignition voltage (7.9—9.6 V) is detected at the voltage monitor of the solenoid valve or motor monitor. (Except engine cranking condition)
―  Low ignition voltage (6.0—7.9 V) is detected at the voltage monitor of the solenoid valve or motor monitor
―  Low ignition voltage (below 6.0 V) is detected at the voltage monitor of the solenoid valve or motor monitor
•  U3003:17
―  High ignition voltage (17 V or more) is detected at the voltage monitor of the solenoid valve or motor monitor
FAIL-SAFE FUNCTION
Refer to DTC TABLE. (See DTC TABLE [DSC HU/CM].)
POSSIBLE CAUSE
Without i-ELOOP
•  DTC is stored in PCM
•  Battery malfunction
•  Generator malfunction
•  Fuse (SRS1 7.5A, ABS/DSCS 30A, ABS/DSCM 50A) malfunction
•  Open or short to GND circuit in wiring harness between battery and DSC HU/CM terminal Q
•  Open or short to GND circuit in wiring harness between battery and DSC HU/CM terminal A
•  Open or short to GND circuit in wiring harness between battery and DSC HU/CM terminal B
•  Open circuit in wiring harness between DSC HU/CM terminal AL and body ground
•  Poor connection at each connector
With i-ELOOP
•  DTC is stored in PCM
•  Battery malfunction
•  DTC is stored in DC-DC converter (i-ELOOP)
•  Fuse (SRS1 7.5A, ABS/DSCS 30A, ABS/DSCM 50A) malfunction
•  Open or short to GND circuit in wiring harness between battery and DC-DC converter terminal 3A
•  Open or short to GND circuit in wiring harness between DC-DC converter terminal 4A and DSC HU/CM terminal Q
•  Open or short to GND circuit in wiring harness between DC-DC converter terminal 4A and DSC HU/CM terminal A
•  Open or short to GND circuit in wiring harness between DC-DC converter terminal 4A and DSC HU/CM terminal B
•  Open circuit in wiring harness between DSC HU/CM terminal AL and body ground
•  Poor connection at each connector


Diagnostic Procedure


Without i-ELOOP

Step

Inspection

Action
1
VERIFY PCM DTC
•  Using the M-MDS, perform the PCM DTC inspection.
•  Are any DTCs present?
Yes
Go to applicable DTC inspection.
(See DTC TABLE [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
(See DTC TABLE [SKYACTIV-D 1.5].)
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.
(See BATTERY RECHARGING.)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
No
Go to the next step.
3
INSPECT GENERATOR
•  Inspect the generator.
•  Is there any malfunction?
Yes
Replace the generator, then go to Step7.
(See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].)
(See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-D 1.5)].)
No
Go to the next step.
4
INSPECT FUSE CONDITION
•  Is the fuse (SRS1 7.5A, ABS/DSCS 30A, ABS/DSCM 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 Q, 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 SUPPLY 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 Q (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 Q
•  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.
•  Inspect for continuity between DSC HU/CM terminal AL (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 AL 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 AL 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 a poor ground.
―  Go to the next step.
7
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Reconnect all disconnected connectors.
•  Using the M-MDS, clear the DTC from the DSC HU/CM.
•  Start the engine and drive the vehicle at 20 km/h {12 mph} or more.
•  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.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].)
(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No
Go to the next step.
8
VERIFY NO DTC IS PRESENT
•  Are any DTCs present?
Yes
Go to applicable DTC inspection.
(See DTC TABLE [DSC HU/CM].)
No
DTC troubleshooting completed.


With i-ELOOP

Step

Inspection

Action
1
VERIFY PCM DTC
•  Using the M-MDS, perform the PCM DTC inspection.
•  Are any DTCs present?
Yes
Go to applicable DTC inspection.
(See DTC TABLE [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
(See DTC TABLE [SKYACTIV-D 1.5].)
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.
(See BATTERY RECHARGING.)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
No
Go to the next step.
3
VERIFY DC-DC CONVERTER DTC
•  Using the M-MDS, perform the DC-DC converter DTC inspection.
•  Are any DTCs present?
Yes
Go to applicable DTC inspection.
(See DTC TABLE [i-ELOOP].)
DTC troubleshooting completed, then go to the next step.
No
Go to the next step.
4
INSPECT FUSE CONDITION
•  Is the fuse (SRS1 7.5A, ABS/DSCS 30A, ABS/DSCM 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 Q, 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 SUPPLY 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 Q (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—DC-DC converter terminal 3A
•  DC-DC converter terminal 4A—DSC HU/CM terminal Q
•  DC-DC converter terminal 4A—DSC HU/CM terminal A
•  DC-DC converter terminal 4A—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.
•  Inspect for continuity between DSC HU/CM terminal AL (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 AL 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 AL 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 a poor ground.
―  Go to the next step.
7
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Reconnect all disconnected connectors.
•  Using the M-MDS, clear the DTC from the DSC HU/CM.
•  Start the engine and drive the vehicle at 20 km/h {12 mph} or more.
•  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.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].)
(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No
Go to the next step.
8
VERIFY NO DTC IS PRESENT
•  Are any DTCs present?
Yes
Go to applicable DTC inspection.
(See DTC TABLE [DSC HU/CM].)
No
DTC troubleshooting completed.