Circuit Description
The automatic transmission fluid temperature (TFT) sensor is a negative coefficient thermistor whose resistance value changes based on temperature. The PCM 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°C to +151°C (-40°F to +304°F).
If the PCM detects a continuous open or a short to power on the TFT sensor circuit, then DTC P0713 sets. DTC P0713 is a type C DTC.
Conditions for Running the DTC
The system voltage is 9-18 volts.
Conditions for Setting the DTC
The PCM detects a TFT sensor voltage greater than 4.92 volts for 6 minutes and 40 seconds continuous.
Action Taken When the DTC Sets
| • | The PCM does not turn on the malfunction indicator lamp (MIL). |
| • | The PCM freezes shift adapts. |
| • | The PCM calculates a default TFT from the ECT sensor and the IAT sensor. |
| • | 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 P0713 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 the DTC passes. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
A value above 4.9 volts indicates the fault is present. A value below 4.9 volts indicates the fault is intermittent.
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A value of 4.9-5.0 volts indicates the PCM and engine side of the wiring are good.
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A short to voltage greater than 5.0 volts will cause the TFT sensor to open.
-
A short between the TFT sensor signal circuit and any other circuit in the transmission harness could cause the TFT sensor to open.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain Diagnostic System Check? | -- | Go to Diagnostic System Check - Engine Controls in Engine Controls | |
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 PCM. Does the Scan Tool display a TFT Sensor voltage greater than the specified value? | 4.9 V | Go to Intermittent Conditions in Engine Controls | ||
Refer to Automatic Transmission Inline Harness Connector End View . Does the voltage measure within the specified range? | 4.9-5.0 V | |||
4 | Does the voltage in Step 3 measure more than the specified value? | 5.0 V | ||
5 |
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
Test the signal circuit (CKT 1227) of the TFT sensor for a short to power between the PCM and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | |||
7 |
Refer to Automatic Transmission Inline Harness Connector End View . Is the resistance less than the specified value? | 100 K ohms | ||
8 |
Refer to Circuit Testing in Wiring Systems. Did you find the condition? | -- | ||
Measure the resistance between terminal L and all other terminals, except M, of the J 44152 jumper harness. Is the resistance between terminal L and all other terminals, except M, greater than the specified value? | 1000 ohms | Go to Intermittent Conditions in Engine Controls | ||
10 | Replace the automatic transmission wiring harness assembly. Refer to Wiring Harness Replacement . Did you complete the replacement? | -- | -- | |
11 | Was the engine harness repaired, or the transmission harness replaced due to a short to power or other circuit? | -- | ||
12 | Replace the automatic transmission fluid temperature sensor. Refer to Fluid Temperature Sensor Replacement . Did you complete the replacement? | -- | -- | |
13 | Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls. Did you complete the replacement? | -- | -- | |
14 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK |
