The PCM/TCM controls the
locking and unlocking of the Torque Converter Clutch (or Damper Clutch),
to the input shaft of the transmission, by appling hydraulic pressure. The
main purpose of T/C clutch control is to save fuel by decreasing the
hydraulic load inside the T/C. The PCM/TCM outputs duty pulses to control
the Damper Clutch Control Solenoid Valve(DCCSV) and hydraulic pressure is
applied to the DC according to the DCC duty ratio value. When the duty
ratio is high, high pressure is applied and the Damper Clutch is locked.
The normal operating range of the Damper Clutch Control duty ratio value
is from 30%(unlocked) to 85%(locked).
The PCM/TCM increases
the duty ratio to engage the Damper Clutch by monitoring slip rpms
(difference vlaue beteween engine speed and turbine speed). To decrease
the slip of the Damper Clutch, the PCM/TCM increases the duty ratio by
appling more hyraulic pressure. When slip rpm does not drop with 100% duty
ratio, the PCM/TCM determines that the Torque Converter Clutch is stuck
OFF and sets this code.
Item
|
Detecting
Condition
|
Possible cause
|
DTC Strategy
|
| •
|
Check the current
range | |
|
Enable Conditions
|
| •
|
10.2V <Battery voltage
<15.5V |
| •
|
TCU communication =
normal | |
Threshold value
|
| •
|
Feed back current
<20mA | |
Diagnostic Time
|
| •
|
more than 5 times × more than 0.1
sec | |
Fail Safe
|
| •
|
Self learning control is
inhibited |
| •
|
Adaptive control is
inhibited | |
| 1. |
Connect scantool to data link
connector(DLC). |
| 3. |
Select "D RANGE" and drive
vehicle. |
| 4. |
Monitor the "TORQUE CONVERTER(DAMPER) CLUTCH"
parameter on the scantool.
Specification
: TCC SLIP<160RPM(In condition that
TCC SOL. DUTY > 80% )
|
|
| 5. |
Does "TCCSV " follow the reference
data?
|
|
▶ Fault is
intermittent caused by poor contact in the sensor's and/or
TCM(PCM)'s connector or was repaired and TCM(PCM) 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
"Terminal and connector inspection"
procedure.
|
|
| Terminal And Connector
Inspection |
| 1. |
Many malfunctions in the electrical system are
caused by poor harness and terminal condition. 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"
procedure.
|
|
| Signal Circuit
Inspection |
| 1. |
Engine "OFF" IG KEY
"ON". |
| 3. |
Perform the continuity test between
"TCCSV(SLU)" terminal and chassis ground.
Specification
: Not continuity
| |
| 4. |
Is resistance within
specifications?
|
|
▶ Go to
"Ground circuit inspection" procedure.
|
|
|
▶ Check for
short to ground in harness. Repair as necessary and Go to
"Verification of Vehicle Repair"
procedure.
|
|
| Ground Circuit
Inspection |
| 1. |
Engine "OFF" IG KEY
"ON". |
| 3. |
Perform the continuity test between Ground
terminal of "TCCSV(SLU)" and chassis ground.
Specification
: Continuity
| |
| 4. |
Is resistance within
specifications?
|
|
▶ Go to
"Component Inspection" procedure.
|
|
|
▶ Check for
short to ground in harness. Repair as necessary and Go to
"Verification of Vehicle Repair"
procedure.
|
|
| 1. |
Engine "OFF" IG KEY
"OFF". |
| 3. |
Measure resistance both terminal of
"TCCSV".
Specification
: Approx. 5.0~5.6Ω
(20°C)
| |
| 4. |
Is resistance within
specifications?
|
|
▶
Substitute with a known-good PCM/TCM and check for proper
operation. If the problem is corrected, replace PCM/TCM as
necessary and then go to "Verification of Vehicle Repair"
procedure.
|
|
|
▶ Replace
"TCCSV" as necessary and Go to "Verification of Vehicle
Repair"
procedure.
|
|
NOTE)
When replacing the TCU,
must perform the N position learning and the Initial learning. (refer to
Troubleshooting's 'How to perform N position learning' and 'How to perform
initial learning')
| 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.
|
|
