Diagnostic Instructions
DTC Descriptor
DTC P0711: Transmission Fluid Temperature (TFT) Sensor Performance
Typical Scan Tool Data
Transmission Fluid Temperature
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
|
Operating Conditions:
Engine running in PARK, normal operating temperature
Parameter Normal Range:
Varies near coolant temperature
|
Trans. Fluid Temp.
| 150°C (304°F)
| -40°C (-40°F)
| -40°C (-40°F)
|
Circuit/System Description
The automatic transmission fluid temperature (TFT) sensor is a thermistor type sensor. The transmission control module (TCM) supplies a 5-volt reference signal to the sensor. When the transmission fluid is cold, the sensor resistance is high
and the TCM senses a high signal voltage. As the transmission fluid warms, the sensor resistance lowers and the TCM senses lower voltage. The TCM uses the TFT reading in order to control the torque converter clutch (TCC), line pressure adjustments, and
temperature compensated shifts.
Conditions for Running the DTC
| • | DTCs P0117, P0118, P0716, P0717, P0722, or P0723 are not set. |
| • | The ignition voltage is between 8 and 18 volts. |
| • | The engine speed is between 500 and 6,500 RPM for 5 seconds. |
| • | DTC P0711 has not passed this ignition cycle. |
Condition 1
| • | The engine coolant temperature (ECT) is at least 70°C (158°F) and has changed by 55°C (99°F) since start-up. |
| • | The vehicle speed is 8 km/h (5 mph) or greater for at least 5 minutes cumulative. |
| • | The TFT is -39 to +149°C (-38 to +300°F). |
Condition 2
| • | The ECT is at least 70°C (158°F) and has changed by 55°C (99°F) since start-up. |
| • | The vehicle speed is 8 km/h (5 mph) or greater for at least 5 minutes cumulative. |
| • | The TFT is 129-149°C (264-300°F). |
Condition 3
| • | The calc. throttle position is between 2 and 90 percent. |
| • | The engine torque is between 50-1,492 N·m (37-1,100 lb ft). |
| • | The vehicle speed is 8 km/h (5 mph) or greater. |
| • | The TFT is -39 to +149°C (-38 to +300°F). |
Conditions for Setting the DTC
Condition 1
The change in TFT is 2°C (4°F) or less when the TFT is -39 to +20°C (-38 to +68°F) at start-up for 80 seconds.
Condition 2
The change in TFT is 2°C (4°F) when the TFT is 129-149°C (264-300°F) at start-up for 80 seconds.
Condition 3
The change in TFT is 20°C (68°F) or less after a predetermined time.
Action Taken When the DTC Sets
DTC P0711 is a Type C DTC.
Conditions for Clearing the DTC
DTC P0711 is a Type C DTC.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
Special Tools
| • | J 35616
GM-Approved Terminal Test Kit |
Circuit/System Verification
Drive the vehicle while observing the Trans. Fluid Temp. parameter on the scan tool. The Trans. Fluid Temp. parameter should rise by 3°C (5°F) or greater.
Circuit/System Testing
- Ignition OFF, disconnect the transmission 20-way harness connector.
- Ignition ON, verify that the TFT sensor parameter is at -40°C (-40°F).
| ⇒ | If greater than the specified range test the TCM side of the 20-way harness connector signal circuit terminal L for a short to ground. If the circuit tests normal, replace the TCM. |
- Ignition OFF, test the TCM side of the transmission 20-way harness connector for less than 5 ohms of resistance between the low reference circuit terminal M and ground.
| ⇒ | If greater than the specified range test the low reference circuit for a an open/high resistance. If the circuit tests normal, replace the TCM. |
Important: If the signal circuit of the TFT sensor is shorted to voltage the TFT sensor may be damaged.
- Install a 3-amp fused jumper wire between the signal circuit terminal L and the low reference circuit terminal M on the TCM side of the transmission 20-way harness connector. Verify the TFT sensor parameter is greater than 128°C
(262°F).
| ⇒ | If less than the specified range test the signal circuit of the TFT sensor for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM. |
- If all circuits test normal, test or replace the internal transmission wiring harness or the TFT sensor.
Component Testing
Install the
J 44152
jumper harness (20 pins) on the transmission side of the automatic transmission 20-way inline connector. Using the
J 35616
GM-approved
terminal test kit, measure the resistance between the TFT sensor signal circuit and the low reference circuit. Refer to
Transmission Fluid Temperature Sensor Specifications.
| ⇒ | If the resistance is not within the specified range, replace the transmission wiring harness or the TFT sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
