P0711

DTC P0711 Transmission Fluid Temperature (TFT) Sensor Circuit Range/Performance





Circuit Description
The TFT sensor is a thermistor that controls the signal voltage to the PCM. The PCM supplies a 5-volt reference signal to the sensor on circuit RED/WHT. When the transmission fluid is cold, the sensor resistance is high and the PCM detects high signal voltage. As the transmission fluid temperature increases to normal operating temperature of 100°C (212°F), the sensor resistance becomes less and the voltage decreases to 1.5 to 2 volts.
When the PCM detects a TFT sensor that remains at the start-up value, or a sensor that has a change delta of greater than 20°C (36°F) less than 1 second, DTC P0711 sets. DTC P0711 is a type D.

Conditions For Setting The DTC
- No VSS DTCs P0722 or P0723.
- No Transmission Component Slipping DTC P1 870.
- Engine is running.
- TFT is between 20 A/D (Analog/Digital) counts and 248 A/D counts.
- TFT is between -40°C (-40°F) and +21°C (69.8°F) at engine start-up.
- Engine coolant temperature is greater than 70°C (150°F).
- Engine coolant temperature has changed by greater than 50°C (90°F) since engine start-up.
- Vehicle speed has been greater than 5 mph for greater than 410 seconds since engine start-up (cumulative timer).
- TCC slip speed has been greater than 120 rpm for greater than 410 seconds since engine start-up (cumulative timer).
- Battery voltage is between 10 and 16 volts.
All of the above is true and either of the following occurs:
- If the sensor is stuck, the TFT has not changed for greater than 2 counts (from start-up temperature) for greater than 410 seconds.
- If the sensor shows an unrealistic change, the TFT exhibits a change delta of greater than 20°C (36°F), greater than 14 times in 7 seconds.

Action Taken When The DTC Sets
- Transmission default temperature will be:
80°C (176°F) if engine temperature code is set.
100°C (212°F) if engine temperature is warm.
80°C (176°F) if engine run time is greater than 5 minutes.
21°C (69.8°F) if engine run time is less than 5 minutes.
- The PCM will not illuminate the Malfunction Indicator Lamp (MIL).

Conditions For Clearing The DTC
- The DTC can be cleared from the PCM history by using a scan tool.
- The DTC will be cleared from history when the vehicle has achieved 40 warm-up cycles without a failure reported.
- The PCM will cancel the DTC default actions when the fault no longer exists and the ignition is cycled "off' long enough to power down the PCM.

Diagnostic Aids
- Inspect the wiring for poor electrical connection at the PCM. Inspect the wiring for poor electrical connections at the transmission 16-way connector. Look for the following conditions:
a. A bent terminal
b. A backed out terminal
c. A damaged terminal
d. Poor terminal tension
e. A chafed wire
f. A broken wire inside the insulation
- When diagnosing for an intermittent short or open connection, move the wiring harness while watching the test equipment for a change.
- First diagnose and clear any engine DTCs or TP Sensor codes. Then inspect for any transmission DTCs that may have reset.





Step 1 - 4





Step 5 - 12

Test Description
The number below refers to the step number on the diagnostic chart:
3. This test checks PCM and associated wiring up to the 16-way connector. If the voltage increases to match chart the problem is isolated to the transmission wiring.





Resistance Chart