AF23-5 Automatic Transaxle

AF23-5 AUTOMATIC TRANSAXLE

DTC P0713

Test 1-6:

Test 7-11:

Circuit Description with AF23-5 Automatic Transaxle
The automatic transmission fluid temperature (TFT) sensor is part of the internal automatic transmission wiring harness assembly. The TFT sensor is a thermistor, or a resistor that changes value when the temperature changes. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The transmission control module (TCM) supplies a 5 volt reference signal to the sensor and measures the voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the TCM detects high signal voltage. As the fluid temperature increases, the resistance of the sensor decreases, which lowers the signal voltage.

If the TCM detects an open in the TFT sensor or signal circuit, then DTC P0713 sets. DTC P0713 is a type A DTC.

Conditions for Running The DTC
^ No ECT DTCs.
^ Trans. Protection Mode is OFF.
^ ECT is greater than 50°C (122°F).
^ The engine run time is 15 minutes or greater.
^ The ignition voltage is 8-18 volts.

Conditions for Setting The DTC
The TCM detects a transmission fluid temperature of -40°C (-40°F) or less for 12 seconds.

Action Taken When the DTC Sets
^ The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL).
^ DTC P1719 is disabled.
^ No lock-up slip neutral control or uphill/downhill control until transmission fluid temperature is greater than 40°C (104°F) for 5 seconds.
^ The TCM discontinues updating the transmission adaptive pressure (TAP) memory cells.
^ The TCM uses 30°C (86°F) as a default transmission fluid temperature.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.
^ The TCM stores DTC P0713 in TCM history.

Conditions for Clearing the MIL/DTC
^ The ECM turns off the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission -related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.

Test Description
The number refers to the step number on the diagnostic table.
4. A short to voltage condition will open the TFT sensor.
5. This step tests the internal transmission wiring harness assembly for a short to voltage.