Allison Automatic Transmission

ALLISON AUTOMATIC TRANSMISSION

DTC P0713

DTC P0713 Step 1 - 6:

DTC P0713 Step 7 - 12:

Circuit Description for Allison Automatic Transmission
The Transmission Fluid Temperature (TFT) sensor is a part of the transmission Pressure Switch Manifold (PSM) assembly and is located in the transmission oil pan. The TFT sensor is a thermistor. which changes its value based on temperature of the transmission fluid. The Transmission Control Module (TCM) supplies a 5 V reference voltage signal to the TFT sensor and measures the voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the TCM detects a high signal voltage. As the fluid temperature warms to a normal operating temperature, the resistance becomes less, and the signal voltage decreases. The TCM uses this information to control shift quality and torque converter clutch apply. DTC P0713 is a type B DTC.

Conditions for Running the DTC
^ No DTC, P0711, P0712, P0713.
^ 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.
^ Engine has been running for 20 seconds with coolant temperature above 20°C (68°F).

Conditions for Setting the DTC
DTC P0713 sets when the TCM detects a voltage greater than 4.84 V.

Action Taken When the DTC Sets
^ The TCM illuminates the Malfunction Lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
^ The TCM uses a TFT default value.
^ The TCM freezes shift adapt.
^ The TCM stores is information as Failure Records.
^ The TCM stores DTC P0218 in TCM history.
^ TCM inhibits TCC engagement.

Conditions for Clearing the MIL/DTC
A scan tool can clear the code from the TCM history. The TCM automatically clears the DTC front she 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.
^ A short to power on circuit (CKT 2762) will allow ;a code P0713 to set.
^ A short to power may also damage the TFT sensor.

Test Description
The numbers refer to the step numbers on the diagnostic table.
4. This step tests 5 V reference.
5. This step tests the sensor and internal wining harness.
6. This step tests the wiring harness for a short to power.
8. This step tests the resistance of the TFT sensor