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 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 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 a value generated by thermistor resistance, in a normal operating range, for approximately 1 second or longer. The TCM regards the ATF temperature as fixed at a value of 80 ?.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Check rationality
? Sensor signal circuit is short to ground.
? Faulty sensor
? Faulty PCM
Enable Conditions1)
? Output Speed = 400rpm
? Engine Speed = 1000rpm
? TPS = 3%
? ATF temperature = 25?
? Delay time = 160sec
Enable Conditions2)
? Coolent temp at IG"OFF" - Coolent temp at IG"ON" = 50?
? Engine Coolent temp at IG"ON" = -20?
? ATF temperature at IG "ON" = 25?
Threshold Value1)
? Present Oil temp - Oil temp When the time starts = 2?
Threshold Value2)
? ATF temperature at IG "ON"- Coolent temp at IG"ON" = 10?
Diagnostic Time
? More than 1sec
Fail Safe
? Learning control and Intelligent shift are inhibited.
? Fluid temperature is regarded as 80?
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