Allison Automatic Transmission

ALLISON AUTOMATIC TRANSMISSION

DTC P0713





Test 1-5





Test 6-10





Test 11-13

Circuit Description for Allison Automatic Transmission
The Transmission Fluid Temperature (TFT) sensor is a part of the transmission Pressure Switch Manifold (PSM) assembly. The TFT sensor is a thermistor, which changes its value based on temperature. The Transmission Control Module (TCM) supplies a 5 V reference signal to the TFT sensor. When the transmission fluid is cold, the sensor resistance is high and the TCM detects a high signal voltage. As transmission fluid temperature increases, the resistance becomes less, and the signal voltage decreases. DTC P0713 is a type B DTC.

Conditions for Running the DTC
^ The components are powered and ignition voltage is greater than 9 V and less than 18 V.
^ Engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds.

Conditions for Setting the DTC
DTC P0713 sets when the TCM detects a voltage greater than 4.84 V across the transmission fluid temperature sensor pins or a temperature less than -36°C (-32.8°F) for 2 seconds.

Action Taken When the DTC Sets
^ DTC P0713 will be stored in the TCM history.
^ The TCM uses a TFT default value.
^ Illuminates MIL when active.

Conditions for Clearing the MIL/DTC
A scan tool can clear the code from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

Diagnostic Aids
^ Inspect the wiring for poor electrical connections at the TCM. Look for the following conditions:
- A bent terminal
- A backed-out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire
- A broken wire inside the insulation.
^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
^ You may have to drive the vehicle in order to experience a fault.
^ An open or a short to power on wire 210 may allow a code P0713 to set. A default value of -60°C (-76°F) TFT on the Scan Tool would be a good indication this has occurred.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests 5 V reference voltage.
5. This step tests for unrealistic changes in TFT.
6. This step tests the TFT sensor and internal wiring harness.
7. This step tests the wiring harness for opens/shorts.
9. This step tests the resistance of the TFT sensor.