ITCC(Intelligent Torque
Control Coupling) 4WD :
Vehicle uses 2WD(2 wheel
drive) for driving at normal speed, but sometimes it uses 4WD (4 wheel
drive) accordign to driving condition. (cornering or
acceleration)
EMC(Electric Magnetic
Clutch) distributes proper torque to front wheel by controling amount of
current inside EMC coil.
That time power pressing
the multi plate clutch by apply cam is changed by a rate of EMC duty.
after multi plate clutch start slip the force for acceletion at front/rear
wheel is controlled at a range of 100:0 ~ 50 : 50.
This DTC code is related
to the EMC and is set If control harness has an short to battery
source.
If failure is detected
"4WD-ECM" prohibits the "ITCC" control and vehicle is controlled with 2WD
by intercepting EMC current.
Item
|
Detecting
Condition
|
Possible Cause
|
DTC
Strategy
|
|
| •
|
Connector looseness and poor terminal to
wire connection. |
| •
|
EMC circuit short to
battery. |
|
Threshold
Value
|
| •
|
Supply voltage lowering flag not set(0),
And No over current error.
PWM DUTY≥90% and Coil current≤0.1A or
PWM DUTY≤10%and Coil
current≥3.0A | |
Fail
Safe
|
|
| 1. |
Connect scantool to Data Link
Connector(DLC). |
| 2. |
Warm up the engine to normal operating
temperature. |
| 3. |
Monitor DTC(Diagnostics Trouble Code) on the
scantool.
|
| 4. |
Is the same DTC displayed again?
|
|
▶ Go to "
Inspection/Repair " procedure .
|
|
|
▶ Fault is
intermittent caused by poor contact in the sensor’s and/or
"4WD-ECM"s connector or was repaired and "4WD-ECM" memory was
not cleared.
Thoroughly check
connectors for looseness, poor connection, bending, corrosion,
contamination, deterioration, or damage.
Repair or replace as necessary and go to
"Verification of vehicle Repair"
procedure
|
|
| Terminal And Connector
Inspection |
| 1. |
Many malfunctions in the electrical system are
caused by poor harness and terminals.
Faults can also be caused by interference from
other electrical systems, and mechanical or chemical
damage. |
| 2. |
Thoroughly check connectors for looseness,
poor connection, bending, corrosion, contamination, deterioration,or
damage. |
| 3. |
Has a problem been found?
|
|
▶ Repair as
necessary and go to "Verification of Vehicle Repair"
procedure.
|
|
|
▶ Go to
"Signal circuit inspection-EMC(-)"
procedure.
|
|
| Signal Circuit (+)
Inspection |
Signal Circuit Inspection-EMC(-)
| 2. |
4WD ECM, EMC :
Connect. |
| 3. |
IG KEY : ON, Engine :
ON. |
| 4. |
Monitor signal waveform between EMC(-)
terminal of 4WD-ECM harness connector and chassis
ground. |
| 5. |
Start and drive vehicle in gear and maintain
vehicle speed is approx. 10km/h or less(6mph or less)
Specification
: Signal Waveform &
Data
|
|
The above value is only for
reference.
The actual value may differ from it
according to various engine
condition. | |
| 6. |
Is "Signal display" near the specified
value?
|
|
▶ Fault is
intermittent caused by poor contact in the sensor’s and/or
"4WD-ECM"s connector or was repaired and "4WD-ECM" memory was
not cleared.
Thoroughly check
connectors for looseness, poor connection, bending, corrosion,
contamination, deterioration, or damage.
Repair or replace as necessary and go to
"Verification of vehicle Repair" procedure.
|
|
|
▶ Go to
"Signal circuit battery short Inspection"
procedure.
|
|
| Power Supply Circuit
Inspection |
Signal Circuit Battery Short Inspection
| 2. |
4WD ECM : Connect, EMC :
Disconnect. |
| 4. |
Measure voltage between EMC(+) terminal of EMC
harness connector and chassis ground.
Specification
: 1 V below
|
|
The above value is only for
reference.
The actual value may differ from it
according to various engine
condition. | |
| 5. |
Is "voltage" display near the specified
value?
|
|
▶ Go to
"Signal circuit short Inspection-EMC(+,-)"
procedure.
|
|
|
▶ Check for
short to battery in EMC harness.
▶
Repair as necessary and then go to "Verification of Vehicle
Repair"
procedure.
|
|
| Signal Circuit
Inspection |
Signal Circuit Short Inspection-EMC(+,-)
| 2. |
4WD ECM : Connect, EMC :
Disconnect. |
| 3. |
Measure resistance between EMC(+) terminal of
EMC harness connector and EMC(-) terminal of EMC harness
connector.
|
The above value is only for
reference.
The actual value may differ from it
according to various engine
condition. | |
| 4. |
Is "resistance" display near the specified
value?
|
|
▶ Go to "
Component inspection " procedure .
|
|
|
▶ Check for
short in EMC harness.
▶ Repair as
necessary and then go to "Verification of Vehicle Repair"
procedure.
|
|
Check EMC
| 2. |
4WD ECM : Connect, EMC :
Disconnect. |
| 3. |
Measure resistance between EMC(+) terminal of
EMC harness connector and EMC(-) terminal of EMC harness
connector.(Component side)
Specification
: Approx 1.8 ~ 2.2
Ω
|
|
The above value is only for
reference.
The actual value may differ from it
according to various engine
condition. | |
| 4. |
Is "resistance" display near the specified
value?
|
|
▶
Substitute with a known-good "4WD-ECM" and check for proper
operation.
If the problem is
corrected, replace "4WD-ECM" and then go to "Verification of
Vehicle Repair" procedure.
|
|
|
▶
Substitute with a known-good "EMC" and check for proper
operation.
If the problem is
corrected, replace "EMC" and then go to "Verification of
Vehicle Repair"
procedure.
|
|
| Verification of Vehicle
Repair |
After a repair, it is
essential to verify that the fault has been corrected.
| 1. |
Connect scan tool and select "Diagnostic
Trouble Codes(DTCs)" mode |
| 2. |
Using a scantool, Clear
DTC. |
| 3. |
Operate the vehicle within DTC Enable
conditions in General information. |
| 4. |
Are you DTCs present?
|
|
▶ Go to the
applicable troubleshooting procedure.
|
|
|
▶ System
performing to specification at this
time.
|
|
