The automatic TRANSAXLE
fluid(ATF) temperature sensor is installed in the Valve Body. This sensor
uses a thermistor whose resistance changes according to the temperature
changes. The TCM supplies a 5V reference voltage to the sensor, and the
output voltage of the sensor changes when the ATF temperature varies. The
automatic TRANSAXLE fluid(ATF) temperature provides very important data
for the TCM's control of the Torque Converter Clutch, and is also used for
many other purposes.
This DTC code is set
when the ATF temperature output voltage is higher than a value generated
by thermistor resistance, in a normal operating range, for an extended
period of time . The TCM regards the ATF temperature as fixed at a value
of 80°C(176°F).
Item
|
Detecting
Condition
|
Possible cause
|
DTC Strategy
|
| •
|
Check the voltage
range | |
|
Enable Conditions
|
| •
|
10.2V <Battery voltage
<15.5V |
| •
|
Engine coolant temp. >
50°C |
| •
|
Shift lever switch =
normal | |
Threshold Value
|
|
Diagnostic Time
|
| •
|
More than 30times × more than10
seconds | |
Fail Safe
|
| •
|
Self learning control is
inhibited. |
|
ATF
temperature [°C (°F)]
|
Resistance
(KΩ)
|
10
(50)
|
5.62 ~
7.31
|
25
(77)
|
3.5
|
110
(230)
|
0.22 ~
0.27
|
| 1. |
Connect scantool to data link
connector(DLC). |
| 3. |
Monitor the "OIL TEMPERATURE SENSOR" parameter
on the scan tool.
Specification
: Increasing
Gradually
|
|
| 4. |
Does "OIL TEMPERATURE SENSOR" 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
"OFF". |
| 3. |
Perform the continuity test between ATF sensor
terminal and chassis ground.
Specification
: Not 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 the resistance for "TRANSAXLE FLUID
TEMPERATURE SENSOR".
Specification
: Refer to a table
|
ATF
temperature [°C (°F)]
|
Resistance (KΩ)
|
10
(50)
|
5.62 ~
7.31
|
25
(77)
|
3.5
|
110
(230)
|
0.22 ~
0.27
|
|
| 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
"TRANSAXLE FLUID TEMPERATURE SENSOR" 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.
|
|
