Transmission Fluid Temperature (TFT) sensor is a negative coefficient thermistor within Transmission Fluid Pressure (TFP) position switch. TFT sensor controls signal voltage from PCM. PCM provides a 5-volt reference to sensor on TFT sensor signal circuit.
When transmission fluid is cold, sensor resistance is high, and PCM detects high signal voltage. As transmission fluid temperature increases, sensor resistance decreases and voltage decreases.
At normal operating temperature of 212 F (100 C), voltage is about 1.5-2 volts.
DTC P0713 is set if PCM detects a continuous open or short to voltage in TFT sensor signal circuit or TFT sensor
what do you have for codes ?
Inspect wiring for poor connections at PCM and at transmission 20-pin connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Check for broken wire inside insulation. If diagnosing for intermittent short or open condition, move wiring harness while observing scan tool for value change. Check engine and transmission harness for open condition.
Friday, February 5th, 2010 AT 10:44 PM