The automatic transmission fluid(ATF) temperature sensor is installed in the Valve Body. This sensor uses a thermistor whose resistance changes according to the temperature changes. The PCM/TCM supplies a 5V reference voltage to the sensor, and the output voltage of the sensor changes when the ATF temperature varies. The automatic transmission fluid(ATF) temperature provides very important data for the PCM/TCM’s control of the Torque Converter Clutch, and is also used for many other purposes.
This DTC code is set when the ATF temperature output voltage is lower than the value generated by thermistor resistance, in a normal operating range, for approximately 1 second or longer. The PCM/TCM regards the ATF temperature as fixed at a value of 80 ?(176?), if this DTC is detected.
Item
Detecting Condition
Possible cause
DTC Strategy
? Check for ground short
? Sensor signal circuit is short to ground.
? Faulty sensor
? Faulty PCM/TCM
Enable Conditions
? Continuous
Threshold Value
? Voltage <0.49V
Diagnostic Time
? More than 1sec
Fail Safe
? Learning control and Intelligent shift are inhibited.
? Fluid temperature is regarded as 80?(176?)
TEMP.(?)
RESISTANCE(k?)
-40(-40?)
139.5
80(176?)
1.08
-20(-4?)
47.7
100(212?)
0.63
0(32?)
18.6
120(248?)
0.38
20(68?)
8.1
140(284?)
0.25
40(104?)
3.8
160(320?)
0.16
60(140?)
1.98