Circuit Description
The automatic transmission fluid temperature (TFT) sensor is a negative coefficient thermistor whose resistance value changes based on temperature. The transmission control module (TCM) provides a 5-volt reference to the sensor. A low fluid temperature, an open TFT sensor or sensor circuit results in high signal voltage. The TFT operating range is -40 to +151°C (-40 to +304°F).
If the TCM detects a continuous open or a short to voltage on the TFT sensor circuit, then DTC P0713 sets. DTC P0713 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
Conditions for Running the DTC
| • | No ISS DTC P0716 or P0717. |
| • | No VSS DTC P0722 or P0723. |
| • | The engine speed is greater than 500 RPM for 5 seconds. |
| • | The output speed is 70 RPM or greater for 200 seconds cumulatively. |
| • | The TCC slip speed is 120 RPM or greater for 200 seconds cumulatively. |
Conditions for Setting the DTC
The TCM detects a TFT less than -40°C (-40°F) for 80 seconds.
Action Taken When the DTC Sets
| • | The TCM does not request the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL). |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM calculates a default TFT from the ECT sensor, the IAT sensor and engine run time. |
| • | 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 P0713 in TCM history. |
Conditions for Clearing the DTC
| • | A scan tool can clear the 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. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
A value of 4.9-5.0-volts indicates the TCM and engine side of the wiring are good.
-
A short to voltage greater than 5-volts would cause the TFT sensor to open.
-
A short to the TFT sensor signal circuit and any other circuits in the transmission harness could cause the TFT sensor to open.
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Failure Records for reference. Using the Clear Info function will erase the stored Failure Records from the TCM. Does the scan tool display a TFT Sensor voltage greater than the specified value? | -40°C (-40°F) | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||
Does the voltage measure within the specified range? | 4.9-5.0 V | Go to Step 7 | Go to Step 4 | |||||
4 | Does the voltage in Step 3 measure greater than the specified value? | 5.0 V | Go to Step 6 | Go to Step 5 | ||||
5 |
Refer to Testing for Continuity and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 13 | ||||
Test the signal circuit of the TFT sensor for a short to voltage between the TCM and the automatic transmission inline 20-way connector. Refer to Testing for a Short to Voltage and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 13 | |||||
7 |
Is the resistance less than the specified value? | 100 K ohms | Go to Step 9 | Go to Step 8 | ||||
8 |
Refer to Testing for Continuity . Did you find the condition? | -- | Go to Step 10 | Go to Step 12 | ||||
Measure the resistance between the TFT sensor signal and all other terminals, except the TFT sensor low reference, of the J 44152 . Is the resistance greater than the specified value? | 1,000 ohms | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 10 | |||||
10 | Replace the automatic transmission wiring harness assembly. Refer to Wiring Harness Replacement . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||
11 | Did you repair the engine harness or replace the transmission harness because of a short to power or other circuit? | -- | Go to Step 12 | Go to Step 14 | ||||
12 | Replace the automatic transmission fluid temperature sensor. Refer to Fluid Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- | ||||
13 | Replace the TCM. Refer to Control Module References for replacement, setup and programming. Did you complete the replacement? | -- | Go to Step 14 | -- | ||||
14 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 15 | Go to Step 2 | ||||
15 | 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 |
