P0712

DTC P0712

Schematic:

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 high fluid temperature or a short to ground on the signal circuit results in low signal voltage. The TFT operating range is -40 to +151°C (-40 to +305°F).
If the PCM detects a continuous short to ground in the TFT sensor circuit, then DTC P0712 sets. DTC P0712 is a type C DTC.

Conditions for Running the DTC
- The system voltage is 8 - 18 volts.
- The engine run time is greater than 5 seconds.

Conditions for Setting the DTC
The PCM detects a TFT of 149°C (300°F) or greater for 10 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 P0712 in PCM history.

Conditions for Clearing the DTC
- A scan tool can clear the ETCH
- 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

Steps 1-8:

Steps 9-11:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies DTC P0712 by indicating a short to ground. If the scan tool does not display a transmission fluid temperature equal to or greater than 149°C (300°F), then the DTC is intermittent.
3. This step isolates the transmission. if the scan tool displays a transmission fluid temperature less than -38°C (-36°F), then the engine wiring harness is good.