GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Transmission/Transaxle 🢒 Automatic Transmission - ZF 4HP 16 🢒 DTC P0710

Circuit Description

The transmission fluid temperature (TFT) sensor is a positive temperature coefficient thermistor (temperature sensitive resistor) that provides information to the transmission control module (TCM) regarding transaxle fluid temperature. The temperature sensor is located in the valve body. Calculated temperature is a factor used to determine the shift time and the shift delay time.

The internal electrical resistance of the sensor varies in relation to the operating temperature of the transaxle fluid.

The TCM sends a 5-volt reference signal to the temperature sensor and measures the voltage rise in the electrical circuit. A higher fluid temperature creates a higher resistance in the temperature sensor, thereby measuring a higher voltage signal.

The TCM measures this voltage as another input to help control line pressure, shift schedules, and the torque converter clutch (TCC) apply. When the transaxle fluid temperature reaches 120°C (248°F), the TCM enters hot mode. Above this temperature, the TCM modifies the transaxle shift schedules and TCC apply in an attempt to reduce the fluid temperature by reducing transaxle heat generation.

Conditions for Setting the DTC
    • The calculated temperature is compared with the predetermined minimum and maximum value.
    • If the temperature is less than minimum value or greater than maximum value then the current temperature is regarded as of range and the corresponding error but will be set.
    • Transmission fluid temperature is not between -40°C (-40°F) and 150°C (302°F).

Action Taken When the DTC Sets
    • No lamp control required but diagnostic information should be stored immediately when malfunction is defected.
    • TCM assumes the transaxle fluid temperature is 60°C (124°F).
    • No influence on driveability.

Conditions for Clearing the MIL/DTC

Using a scan tool can clear history DTCs.

Diagnostic Aids

When DTC P0710 sets, the possible cause of fault could be the transmission temperature sensor.

DTC 0710

Step

Action

Values

Yes

No

1

Perform the Diagnostic System Check.

Is the check complete?

--

Go to Step 2

Go to Diagnostic System Check - Automatic Transmission

2
  1. Install the scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. Record then clear the DTCs.
  4. Turn the ignition OFF, then turn the ignition ON.
  5. Select TFT on the scan tool.
  6. Drive the vehicle. Observe the scan tool for either of the following conditions:
    7. • The transmission fluid temperature (TFT) does not change more than 1.5°C (34.7°F) in 80 seconds since start-up.
    • The TFT changes more than 20°C (68°F) within 7 seconds (unrealistic change).

Did either of the fail conditions occur?

--

Go to Step 3

Go to Diagnostic Aids

3
  1. Turn the ignition OFF.
  2. Disconnect the transaxle wiring connector.
  3. Measure the resistance between terminals 9 and 4 of the transaxle wiring connector.

Is the resistance equal to the specified value?

TFT 25° C 990 ohms

Go to Step 7

Go to Step 4

4
  1. Remove the oil pan.
  2. Disconnect the wiring connector of the transaxle fluid temperature sensor.
  3. Inspect the automatic transaxle wiring harness for an intermittent short or open.

Was a problem found?

--

Go to Step 5

Go to Step 6

5

Replace the automatic transaxle wiring harness.

Is the replacement complete?

--

System OK

--

6

Replace the TFT sensor.

Is the action complete?

--

System OK

--

7
  1. Disconnect the automatic transaxle wiring connector.
  2. Disconnect the wiring connector of the transmission control module (TCM).
  3. Measure the resistance between terminal 4 of the transaxle wiring connector and terminal B1 of the TCM wiring connector.
  4. Measure the resistance between terminal 9 of the transaxle wiring connector and terminal A4 of the TCM wiring connector.

Is the resistance approximately equal to the specified value?

0 ohms

Go to Step 9

Go to Step 8

8
  1. Inspect the automatic transaxle wiring harness for an intermittent short to ground or open condition.
  2. Inspect the automatic TFT sensor wiring harness for an intermittent short to ground or open condition.
  3. Repair the circuits, if necessary.

Is the repair complete?

--

System OK

--

9
  1. Turn the ignition ON, with the engine OFF.
  2. Measure the voltage of terminal A4 of the TCM wiring connector.
  3. Measure the voltage of terminal B1 of the TCM wiring connector.

Is the voltage within the specified value?

9-16 V

Go to Step 10

Go to Step 11

10
  1. Inspect the automatic transaxle wiring harness for an intermittent short to power.
  2. Inspect the automatic TFT sensor wiring harness for an intermittent short to power.
  3. Repair the circuits, if necessary.

Is the repair complete?

--

System OK

--

11

Replace the TCM. Refer to Transmission Control Module Replacement .

Is the replacement complete?

--

Go to Step 12

--

12
  1. After the repair, use a scan tool "clear info" function.
  2. Road test the vehicle.
  3. Review the DTC info.

Has the last test failed or is the current DTC displayed?

--

Go to Step 2

System OK