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 the 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 ?, if this DTC is detected.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Check voltage range
? Open in circuit.
? Faulty sensor
? Faulty PCM/TCM
Enable Conditions
? Engine speed >1000rpm
? Output speed > 500rpm
? Accumulated time in above condition : 160sec
? Coolent temperature > 70?
Threshold Value
? Voltage > 4.547V
Diagnostic Time
? More than 1 second
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