Circuit Description
The automatic transmission fluid temperature (TFT) sensor is a negative coefficient thermistor. When the transmission fluid is cold, the sensor resistance is high. As the transmission fluid warms up, the sensor resistance decreases. This diagnostic monitors the TFT circuit. The circuit may be functional, but not in the normal operating range. This diagnostic indicates stuck or skewed, inaccurate values, indicating poor system performance. The TFT range is -40 to +151°C (-40 to +305°F).
If the transmission control module (TCM) detects no voltage change in the TFT sensor circuit, then DTC P0711 sets. DTC P0711 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0711 Transmission Fluid Temperature (TFT) Sensor Performance
Conditions for Running the DTC
| • | Trans. Protection Mode is OFF. |
| • | Vehicle speed is greater than 40 Km/hr. |
| • | The transmission range switch is DRIVE, INTERMEDIATE, LOW or REVERSE. |
| • | The TFT at startup is less than 20°C (68°F). |
Conditions for Setting the DTC
The TFT has not changed by more than 5°C (9°F) since startup for 900 seconds (15 minutes).
Action Taken When the DTC Sets
| • | The TCM requests the powertrain control module (PCM) to illuminate the malfunction indicator lamp (MIL). |
| • | DTC P1719 is disabled. |
| • | No lock-up slip neutral control or uphill/downhill control until transmission fluid temperature is greater than 40°C (104°F) for 5 seconds. |
| • | The TCM discontinues updating the transmission adaptive pressure (TAP) memory cells. |
| • | The TCM uses 30°C (86°F) as a default transmission fluid temperature. |
| • | The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records. |
| • | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record. |
| • | The TCM stores DTC P0711 in TCM history. |
Conditions for Clearing the MIL/DTC
| • | The PCM turns off the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request. |
| • | A scan tool can clear the DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring. |
| • | The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||
2 | Perform the Transmission Fluid Checking Procedure. Refer to Transmission Fluid Check . Did you perform the Transmission Fluid Checking Procedure? | -- | Go to Step 3 | Go to Transmission Fluid Check | ||||
3 |
Important:
The Transmission Fluid Temperature (TFT) sensor does not change greater than 5°C (9°F) in 15 minutes since startup. Did the condition occur? | -- | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections | ||||
Did the scan tool display a condition in which the Trans. Fluid Temp. does not change by greater than the specified value from the valve observed during step 3? | 5°C (9°F) | Go to Step 6 | Go to Step 5 | |||||
5 | Replace the automatic transmission wiring harness. Refer to Wiring Harness Removal in the Unit Repair Manual. Did you complete the replacement? | -- | Go to Step 7 | -- | ||||
6 | Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 7 | -- | ||||
7 | Perform the following procedure in order to verify the repair:
Does the DTC reset? | -- | Go to Step 2 | Go to Step 8 | ||||
8 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |
