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)
Engine speed >1000rpm and Output speed >1000rpm
Accumulated time in above two condition 5min
Voltage of Battery >10V
A/T oil temp. at start-up and ambient temp.
(<50?) and (>-7?) or A/T oil temp. at start-up <30?
Engine coolant temp. increase since start-up >40?
In condition that A/T oil temp. changing <2?
Enable Conditions2)
A/T oil temp. at previous engine-off >50?
Engine coolant temp. at previous engine-off >73.5?
Engine coolant temp. drop from the previous engine-off >34?
Intake air temperature < 35?
Time after TCM turns on 0.5sec
In condition that A/T oil temp. drop <2? from the previous engine-off
Enable Conditions3)
No = 1000rpm, Ne = 1000rpm for 5min cumulative and the engine coolant temperature=73.5?
In condition that OTS output = -23?
Threshold Value
-
Diagnostic Time
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