The automatic TRANSAXLE 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 TRANSAXLE 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) | ● Intake air temperature ≥ -25℃ ● Engine state = RUN ● No error with relations other sensors ● Engine be cooles sufficiently | |
Enable Conditions2) | ● Engine state = RUN ● Average start up temperature of TM stuck diagnostic ≤ 55℃ | |
Threshold Value1) | ● ATF Temp - Coolant Temp ≥ 20℃ | |
Threshold Value2) | ● ATF Temp - TM start up Temp ≤ 0.5℃ | |
Diagnostic Time1) | ● More than 1 second | |
Diagnostic Time2) | ● More than 900 seconds | |
Fail Safe | ● Learning control and Intelligent shift are inhibited. ● Fluid temperature is regarded as 80℃(176℉) |
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 |
