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, erratic, intermittent, skewed, or inaccurate values, indicating poor system performance. The TFT range is -40 to +151°C (-40 to +305°F).
If the TCM detects no voltage changes or rapid voltage changes in the TFT sensor circuit, then DTC P0711 sets. DTC P0711 is a type C DTC.
Conditions for Running the DTC
| • | For condition 1 and 2 below, no ECT DTC P1792. |
| • | For condition 1 below, no OSS DTCs P0722, or P0723. |
| • | For condition 1 below, no ISS DTCs P0716, or P0717. |
| • | For condition 1 and 2 below, P0711 has not passed in the current ignition cycle. |
| • | The ignition voltage is 8-18 volts. |
| • | The engine speed is greater than 500 RPM for 5 seconds. |
Conditions for Setting the DTC
One of the following conditions occurs:
Condition 1
| • | The transmission fluid temperature at startup is -40 to -20°C (-40 to -4°F). |
| • | The engine coolant temperature is 0°C (32°F) or greater and has changed more than 20°C (36°F). |
| • | The transmission fluid temperature has not changed by more than 2°C (4°F) since startup for 180 seconds. |
Condition 2
| • | The transmission fluid temperature at startup is -20°C and 140°C (-4°F and 284°F). |
| • | The engine coolant temperature is 70°C (158°F) or greater and has changed more than 50°C (90°F). |
| • | The transmission fluid temperature has not changed by more than 2°C (4°F) since startup for 180 seconds. |
| • | The transmission output shaft speed is 400 RPM or greater for 5 minutes. |
| • | The TCC slip speed is 50 RPM or greater for 5 minutes. |
Condition 3
The transmission fluid temperature has changed by 15°C (27°F) or greater 10 times within 2 seconds.
Action Taken When the DTC Sets
| • | The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL). |
| • | SERVICE VEHICLE message displays on the driver information center (DIC). |
| • | The TCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time. |
| • | The TCM freezes garage shift transmission adaptive functions. |
| • | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records. |
| • | The TCM stores DTC P0711 in TCM history. |
Conditions for Clearing the DIC/DTC
| • | The TCM clears the DIC message when the condition no longer exists. |
| • | A scan tool can clear the DIC/DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring. |
| • | The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes. |
Diagnostic Aids
| • | Inspect the connectors at the TCM, the transmission, and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for an intermittent short or open condition in the engine wiring harness. The test light is used as a resistor in the circuit.
-
This step determines if the TCM or the TFT, sensor is causing a steady, unchanging TFT, reading.
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 2.2L (L61) | ||||||||
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:
Did either of the conditions occur? | -- | Go to Step 4 | Go to Intermittent Conditions in Engine Controls - 2.2L (L61) | ||||||||
4 | Did the scan tool display a condition in which the Trans. Fluid Temp. does not change by greater than the specified value in 3 minutes since startup? | 2°C (4°F) | Go to Step 6 | Go to Step 5 | ||||||||
Does the Trans. Fluid Temp. change by greater than the specified value? | 15°C (27°F) | Go to Step 7 | Go to Step 8 | |||||||||
Did the scan tool display a condition in which the Trans. Fluid Temp. does not change by greater than the specified value in 3 minutes? | 2°C (4°F) | Go to Step 9 | Go to Step 8 | |||||||||
7 |
Refer to Circuit Testing and Testing for Short to Ground in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 10 | Go to Step 8 | ||||||||
8 | Replace the control solenoid valve assembly. Refer to Control Valve Body Assembly Disassemble Did you complete the replacement? | -- | Go to Step 10 | -- | ||||||||
9 | Replace the TCM. Refer to Transmission Control Module Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- | ||||||||
10 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 11 | Go to Step 2 | ||||||||
11 | 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? | -- | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.2L (L61) | System OK |
