DTC P0711 TFT Sensor Circuit
Range/Performance 3.8L
The automatic
transmission fluid temperature (TFT) sensor is part of the automatic
transmission fluid pressure (TFP) manual valve position switch. The TFT sensor
is a resistor, or thermistor, which changes value
based on temperature. The sensor has a negative-temperature coefficient. This
means that as the temperature increases, the resistance decreases, and as the
temperature decreases, the resistance increases. The powertrain
control module (PCM) supplies a 5-volt reference signal to the sensor on
circuit 1227 and measures the voltage drop in the circuit. When the
transmission fluid is cold, the sensor resistance is high and the PCM detects
high signal voltage. As the fluid temperature warms to a normal operating
temperature, the resistance becomes less and the signal voltage decreases. The
PCM uses this information to control shift quality and torque converter clutch
apply.
When the PCM detects one
of the following unusual conditions, then DTC P0711 sets.
- An unrealistically large change in
transmission temperature
- A transmission temperature which
remains constant for a period of time in which a measurable amount of
change is expected
DTC P0711 is a type
C DTC.
Conditions
for Running the DTC
- No VSS assembly DTCs P0502 or P0503.
- No transmission component slipping
DTC P1870.
- The system voltage is
8-18 volts.
- The engine is running for
409 seconds.
- The vehicle speed is greater than
8 km/h (5 mph) for 409 seconds cumulative during the
current ignition cycle.
- The TCC slip speed is greater than
120 RPM for 409 seconds cumulative during the current ignition
cycle.
- The TFT at startup is between -40
and +21°C (-40 and +70°F).
- The TFT is between -38 and +151°C
(-36 and +304°F).
- The engine coolant temperature (ECT)
is greater than 70°C (158°F) and has changed by 50°C (90°F) since startup.
Conditions
for Setting the DTC
DTC P0711 sets if one
of the following conditions occurs:
Condition
1
The TFT does not change
more than 1.50°C (2.7°F) for 409 seconds since startup.
Condition
2
The TFT changes more
than 20°C (36°F) in 200 milliseconds 14 times within 7 seconds.
Action
Taken When the DTC Sets
- The PCM does not illuminate the
malfunction indicator lamp (MIL).
- Important
The
scan tool does not indicate the default TFT.
Important
The
actions listed below are in order of highest to lowest priority.
The
PCM determines a default TFT using one of the following:
- If any ECT DTCs P0117 or P0118 are
set, then the default TFT is equal to 135°C (275°F).
- If the ECT is 125°C (257°F) or
more, then the default TFT is equal to 135°C (275°F).
- If the engine run time is less than
300 seconds and:
- No intake air temperature (IAT)
DTCs P0112 or P0113 are set and IAT is available, then the default TFT
is equal to IAT.
- Any IAT DTCs P0112 or P0113 are
set or IAT is NOT available, then the default TFT is equal to 90°C
(194°F).
- If the engine run time is greater
than 300 seconds and No IAT DTCs P0112 or P0113 are set and IAT is
available and ECT is between 40 and 125°C (104 and 257°F) and:
- IAT at startup is less than 15°C
(59°F), then the default TFT is equal to the
ECT plus 5°C (8°F).
- IAT at startup is greater than
35°C (95°F), then the default TFT is equal to
the ECT plus 10°C (16°F).
- IAT at startup is between 15 and
35°C (59 and 95°F), then the default TFT is equal to the ECT.
- If the engine run time is greater
than 300 seconds and any IAT DTCs P0112 or P0113 are set or IAT is
NOT available, then the default TFT is equal to the ECT.
- If the engine run time is greater
than 300 seconds and ECT is less than 40°C (104°F) or more, then the
default TFT is equal to 60°C (140°F).
- The PCM freezes shift adapts from
being updated.
- The PCM records the operating conditions
when the Conditions for Setting the DTC are met. The PCM stores this
information as Failure Records.
- The PCM stores DTC P0711 in PCM
history.
Conditions
for Clearing the DTC
- A scan tool can clear the DTC.
- The PCM clears the DTC from PCM
history if the vehicle completes 40 warm-up cycles without a
non-emission-related diagnostic fault occurring.
- The PCM cancels the DTC default
actions when the fault no longer exists and/or the ignition switch is OFF
long enough in order to power down the PCM.
- Inspect the connectors at the PCM,
the TFT sensor and all other circuit connecting points for an intermittent
condition. Refer to Testing
for Intermittent and Poor Connections in Wiring Systems.
- Inspect the circuit wiring for an
intermittent condition. Refer to Testing
for Electrical Intermittents in Wiring
Systems.
The numbers below refer
to the step numbers on the diagnostic table.
|
DTC P0711 TFT Sensor Circuit Range/Performance (3.8L) Step |
Action |
Value(s) |
Yes |
No |
|
Did
you perform the Powertrain Diagnostic System Check?
|
-- |
Go to A
Powertrain On Board Diagnostic (OBD) System Check
in Engine Controls |
||
|
Inspect
for correct transmission fluid level. Refer to Transmission
Fluid Checking Procedure . Did you perform the fluid checking procedure? |
-- |
|||
Important Before
clearing the DTC, use the Scan Tool in
order to record the Failure Records. Using the Clear Info function erases the
Failure Records from the PCM.
Did
either of the conditions occur? |
-- |
Go to Diagnostic Aids |
||
|
Did
the Scan Tool
display a condition in which the Trans. Fluid Temp. does
not change by more than the specified value in 409 seconds since
startup? |
1.50°C (2.7°F) |
|||
Does
the Scan Tool
Trans. Fluid Temp. change by more than the specified
value? |
20°C (36°F) |
|||
Does
the Scan Tool
display the same condition as in Step 4? |
-- |
|||
Refer
to Circuit
Testing and Wiring
Repairs in Wiring Systems. Did you find and correct the condition? |
-- |
|||
Refer
to Circuit
Testing in Wiring Systems. Did you find an intermittent open or shorted
condition? |
-- |
|||
|
Replace
the AT wiring harness assembly. Refer to Torque
Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and
Wiring Harness Replacement. Did you complete the replacement? |
-- |
-- |
||
|
Replace
the TFT sensor (this sensor is a part of the TFP manual valve position
switch). Refer to Valve
Body and Pressure Switch Replacement . Did you complete the replacement? |
-- |
-- |
||
|
Replace
the PCM. Refer to PCM
Replacement/Programming in Engine Controls. Did you complete the
replacement? |
-- |
-- |
||
|
Perform
the following procedure in order to verify the repair:
Has
the test run and passed? |
-- |
System OK |