DTC P0713 Transmission Fluid Temperature Sensor Circuit High Input
P0713 - Transmission Fluid Temperature
Circuit Description
The Transmission Fluid Temperature (TFT) sensor is incorporated into the internal wiring harness. The TFT sensor is a thermistor that changes its resistance value based on the temperature of the transmission fluid. The Transmission Control Module (TCM) supplies a 5V reference voltage signal to the TFT sensor and measures the voltage drop in the circuit. When the transmission is cold, the sensor resistance is high and the TCM detects high signal voltage. As the transmission fluid temperature warms to normal operating temperature, the resistance and the signal voltage decrease. The TCM uses this information to control shift quality.
Conditions for Running the DTC
• The components are powered and ignition voltage is greater than 9V and less than 18V (12V TCM) or greater than 9V and less than 32V (24V TCM).
• The components are powered and Engine speed is greater than 200 rpm and less than 7500 rpm for 5 seconds.
• When Engine coolant temperature sensor is present, Engine is running. If Engine runtime is less than
10 minutes, then Engine coolant temperature must be above 20ºC (68ºF) for more than 20 seconds.
Conditions for Setting the DTC
The TCM detects transmission fluid temperature less than or equal to a calibrated value for more than 2.5 seconds. NOTE: The TCM is detecting voltage. A high input voltage implies high thermistor resistance, which corresponds to an extremely cold transmission fluid temperature measurement.
Actions Taken When the DTC Sets
When DTC P0713 is active, the following conditions occur:
• The CHECK TRANS light is illuminated.
• DTC is stored in TCM history.
• TCM uses calibration default for temperature values.
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| Figure 1.1 - DTC and General Information (P0713) |
Conditions for Clearing the DTC/CHECK TRANS Light
Use the Allison DOC™ For PC–Service Tool to clear the DTC 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
• DTC P0713 may be caused by a short-to-battery on wire 154. If DTC P0713 is accompanied by a DTC P2185 and/or P2743, the problem is most likely a short-to-battery on wire 154, wire 135, or wire 175.
• DTC code P0713 may also be caused by an open in wire 154 or 158.
• Review Appendix A for diagnosing intermittent electrical fault conditions.
• Inspect the wiring for poor electrical connections at the TCM and service brake switch. 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.
#Test Description
This DTC requires the use of the J 47275 TCM Breakout and J 47279 Transmission Breakout. The numbers below refer to step numbers on the diagnostic table.
2. Tests for proper transmission fluid level and condition.
→Using the Oil Level Sensor (OLS), if equipped, check for correct fluid level. Is the transmission fluid level correct?
3. Verifies which condition has set the DTC P0712.
→Install the Allison DOC™ For PC–Service Tool. With the Engine OFF, turn ON the ignition.
→Record the failure record.
→Clear the DTCs.
→Monitor the TFT on Allison DOC™ For PC–Service Tool.
→Drive the vehicle and observe Allison DOC™ For PC–Service Tool for a low temperature condition. Is the Allison DOC™ For PC–Service Tool transmission fluid temperature less than –45 C (–49 F)?
4. Tests for the proper 5V reference voltage at TCM with OEM harness connected.
→Turn ignition OFF.
→Install J 47275 TCM Breakout at the TCM.
→Disconnect the transmission 20-way connector.
→Turn ignition ON.
→Using a DVOM at J 47275-1 TCM Overlay, measure voltage between pins 54 and 58. Is the voltage within the specified value? 4.75 to 5.0V
5. Tests for proper 5V reference voltage at TCM without the OEM harness.
→Turn ignition OFF.
→Disconnect the 16-pin bypass connector on J 47275 TCM Breakout.
→Turn ignition ON.
→Using a DVOM at J 47275-1 TCM Overlay, measure voltage between pin 54 and 58. Is the voltage within the specified value? 4.75 to 5.0V
6. Tests for wiring defects in external harness.
→Turn ignition OFF.
→Disconnect the TCM from the J 47275 TCM Breakout. Leave the OEM-side connected.
→Reconnect the 16-pin bypass connector on J 47275 TCM Breakout.
→Disconnect the transmission 20-way connector.
→Disconnect the Engine coolant temperature sensor and retarder temperature sensor.
→Using a DVOM at J 47275-1 TCM Overlay, test for opens in wires 154 and 158.
→Also test for wire-to-wire shorts or shorts-to-battery on wire 135, wire 154, or wire 175. Were any wiring defects found?
7. Tests for proper system circuit resistance value.
→Turn ignition OFF.
→Verify the OEM-side harness is connected to the J 47275 TCM Breakout. Leave the TCM disconnected.
→Reconnect the transmission 20-way connector.
→Using a DVOM at J 47275-1 TCM Overlay, measure the resistance between pin 54 and 58. Is the resistance within the specified value? 3511–3653 Ohms at 20 C (68 F)
8. Tests the resistance value of the internal harness and TFT sensor.
→Disconnect the 20-way connector at the transmission and install J 47279 Transmission Breakout. Connect the J 47279 Transmission Breakout to the transmission only. The vehicle side of the harness should not be connected for this test.
→Using a DVOM at J 47279-1 Transmission Overlay, measure resistance between pins 18 and 19 in the 20-way connector. Is the resistance within the specified value? 3511–3653 Ohms at 20 C (68 F)
10. Tests the resistance value of the internal TFT sensor.
→Remove the hydraulic control module assembly.
→Disconnect the sump thermistor from the internal wiring harness.
→Using a DVOM, measure thermistor resistance at pins A and B. Is the resistance within the specified value? 3511–3653 Ohm at 20 C (68 F)
→Replace the internal harness. Is the replacement complete?
→Replace the sump thermistor. Is the replacement complete?
NOTE: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.
To verify the repair:
1. Clear the DTC.
2. Using Allison DOC™ For PC–Service Tool, monitor the transmission fluid temperature.
3. Drive the vehicle under normal operating conditions. Watch for significant changes in TFT.
Did the DTC return?
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