Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0712: Transmission Fluid Temperature (TFT) Sensor Circuit Low VoltageDTC P0713: Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
TFT Sensor Signal | P0712 | P0713 | P0713¹ | -- |
Low Reference | -- | P0713 | P0713¹ | -- |
¹Internal ECM damage may occur if the circuit is shorted to B+. | ||||
Circuit/System Description
The transmission fluid temperature (TFT) sensor is a variable resistor that measures the temperature of the transmission fluid. The engine control module (ECM) supplies 5 volts to the TFT signal circuit and supplies a ground to the low reference circuit.
The following table illustrates the difference between temperature, resistance, and voltage:
TFT | TFT Resistance | TFT Signal Voltage |
|---|---|---|
Cold | High | High |
Warm | Low | Low |
Conditions for Running the DTC
P0712
| • | The engine speed is above 1,000 RPM for 7 seconds. |
| • | This DTC runs continuously when the above condition is met. |
P0713
| • | The engine speed is above 1,000 RPM for 7 seconds. |
| • | This DTC runs continuously when the above condition is met. |
Conditions for Setting the DTC
P0712
The TFT is greater than 145°C (299°F) for more than 5 seconds.
P0713
The TFT is less than -35°C (-31°F) for more than 5 seconds.
Action Taken When the DTC Sets
DTC P0712 and P0713 are Type C DTCs.
Conditions for Clearing the MIL/DTC
DTC P0712 and P0713 are Type C DTCs.
Reference Information
Schematic Reference
Manual Transmission Schematics
Connector End View Reference
Description and Operation
Manual Transmission Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Verification
- Engine running, DTC P0712 or P0713 should not set.
- If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the TFT sensor.
- Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.
- Ignition ON, using a scan tool verify that the TFT sensor parameter is at -40°C (-40°F).
- Install a 3-amp fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the TFT sensor parameter is greater than 128°C (262°F).
- If all circuits test normal, test or replace the TFT sensor.
| ⇒ | If greater than 5 ohms, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than -40°C (-40°F), test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM. |
Important: If the signal circuit of the TFT sensor is shorted to voltage the TFT sensor may be damaged.
| ⇒ | If less than 128°C (262°F), test the signal circuit of the TFT sensor for a short to voltage or an open/high resistance. If the circuit test normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup and programming. |
