GM Service Manual Online
For 1990-2009 cars only

Object Number: 654442  Size: SF
Master Electrical Component List
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice

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 or open circuit result in high signal voltage. The TFT operating range is -40 to +151°C (-40 to +305°F).

If the PCM 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.

Conditions for Running the DTC

    • No VSS DTCs P0502 or P0503.
    • No AT ISS DTCs P0716 or P0717.
    • The system voltage is 8-18 volts.
    • The engine run time is greater than 5 seconds.
    • The transmission output shaft speed is 200 RPM or greater for 5 minutes cumulatively.
    • The TCC slip speed is 50 RPM or greater for 6 minutes and 40 seconds cumulatively.

Conditions for Setting the DTC

The PCM detects a reading of -40°C (-40°F) or less for 6 seconds.

Action Taken When the DTC Sets

    • The PCM does not illuminate the malfunction indicator lamp (MIL).
    • The PCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.
    • 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.

  1. This step tests the TFT sensor signal circuit for being shorted to another circuit within the transmission. If the TFT sensor signal circuit shorts to another circuit, which is carrying voltage greater than five volts, the TFT sensor would become open.

  2. This step tests the TFT sensor signal circuit for being shorted to voltage, which would be the cause for the open in the TFT sensor.

DTC P0713

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Engine Controls in Engine Controls

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Important: Before clearing the DTC, use the scan tool in order to record the DTC Failure Records. Using the Clear Info function erases the Failure Records from the PCM.

  4. Record the DTC Failure Records.
  5. Clear the DTC.
  6. Select Trans. Fluid Temp. on the scan tool.

Does the scan tool display a Trans. Fluid Temp. less than the specified value?

-39°C (-38°F)

Go to Step 3

Go to Intermittent Conditions in Engine Controls

3

  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector. Additional DTCs may set.
  3. Install the J 44152 Jumper Harness (20 pins) on the transmission side of the AT inline 20-way connector.
  4. Using the DMM and the J 35616 GM Terminal Test Kit, measure the resistance between terminals L and M of the J 44152 .

Refer to Automatic Transmission Inline Harness Connector End View .

Is the resistance less than the specified value?

100 K ohms

Go to Step 7

Go to Step 4

4

  1. Test the signal circuit (CKT 1227) of the TFT sensor for an open between the AT inline 20-way connector and the TFT sensor.
  2. Test the low reference circuit (CKT 452) of the TFT sensor for an open between the AT inline 20-way connector and the TFT sensor.

Refer to Circuit Testing in Wiring Systems.

Did you find an open condition?

--

Go to Step 8

Go to Step 5

5

Measure the resistance between terminal L and all other terminals of the J 44152 .

Is the resistance between terminal L and any other terminal less than the specified value?

1000 ohms

Go to Step 10

Go to Step 6

6

Test the signal circuit (CKT 1227) of the TFT sensor for a short to voltage between the PCM connector C2 and the AT inline 20-way connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 9

Go to Step 9

7

  1. Test the signal circuit (CKT 1227) of the TFT sensor for an open between the PCM connector C2 and the AT inline 20-way connector.
  2. Test the low reference circuit (CKT 2762) of the TFT sensor for an open between the PCM connector C2 and the AT inline 20-way connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct an open condition?

--

Go to Step 12

Go to Step 11

8

Important: The automatic transmission wiring harness consists of two separate harnesses, the Automatic Transmission Wiring Harness Assembly, GM P/N 15320475 and the Automatic Transmission Wiring Extension Harness Assembly, GM P/N 15320478. In order to avoid the unnecessary replacement of parts, only replace the Automatic Transmission Wiring Harness Assembly, GM P/N 15320475.

Replace the automatic transmission wiring harness.

Refer to Transmission Overhaul in the 4T80-E section of the Transmission Unit Repair Manual.

Did you complete the replacement?

--

Go to Step 12

--

9

Replace the TFT sensor.

Refer to Transmission Overhaul in the 4T80-E section of the Transmission Unit Repair Manual.

Did you complete the replacement?

--

Go to Step 12

--

10

    Important: The automatic transmission wiring harness consists of two separate harnesses, the Automatic Transmission Wiring Harness Assembly, GM P/N 15320475 and the Automatic Transmission Wiring Extension Harness Assembly, GM P/N 15320478. In order to avoid the unnecessary replacement of parts, only replace the Automatic Transmission Wiring Harness Assembly, GM P/N 15320475.

  1. Replace the automatic transmission wiring harness.
  2. Replace the TFT sensor.

Refer to Transmission Overhaul in the 4T80-E section of the Transmission Unit Repair Manual.

Did you complete the replacements?

--

Go to Step 12

--

11

Replace the PCM.

Refer to Powertrain Control Module Replacement in Engine Controls.

Did you complete the replacement?

--

Go to Step 12

--

12

Perform the following procedure in order to verify the repair:

  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle under the following conditions:
  4. • Turn ON the ignition, with the engine OFF.
    • The Trans. Fluid Temp. must be greater than -40°C (-40°F) for 6 seconds.
  5. Select Specific DTC.
  6. Enter DTC P0713.

Has the test run and passed?

--

System OK

Go to Step 1