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 °C.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Electrical Check |
•
Open in circuit
•
Faulty sensor
•
Faulty PCM | |
Case 1 | Enable Conditions |
•
ATF temperature(IG ON) ≥ -38℃ | |
Threshold Value |
•
Voltage > 4.8V | ||
Case 2 | Enable Conditions |
•
ATF temperature(IG ON) ≥ -38℃ | |
Threshold Value |
•
4.547V < Voltage < 4.8V | ||
Case 3 | Enable Conditions |
•
ATF temperature(IG ON) ≤ -39℃
•
Engine speed > 1000rpm
•
Output Speed ≥ 500rpm
•
Engine Coolant Temperature ≥ 70℃
•
Time Delay = 160 sec | |
Threshold Value |
•
Voltage > 4.547V | ||
Diagnostic Time |
•
More than 1sec. | ||
Fail Safe |
•
Learning control and Intelligent shift are inhibited
•
Fluid temperature is regarded as 80℃ | ||
Temperature ℃(℉) | Resistance (㏀) | Temperature ℃(℉) | Resistance (kΩ) |
-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 |
