The Ambient Temperature is a NTCT type thermistor and is use for temperature regulation including blower motor level and mix mode control .
DTC B1238 sets if Ambient Temperature sensor signal is at or over 4.9V for 0.3 seconds.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
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Voltage check | 1. Open in signal circuit. 2. Shrot to battery in signal circuit. 3. Faulty Ambient Temperature sensor. 4. Faulty air condtioner control Module. |
Enable Conditions |
–
Ignition ON | |
Threshold value |
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Ambient Temperature sensor signal is at or over 4.9V for 0.3 seconds. | |
Failsafe |
–
Displayed '--' and A/C control Module regards and controls it as 20℃(68℉) |
※ Resistance value of ambient temp.sensor as a function of temperature.
Temperature(℃/℉) | Resistance(㏀) | Temperature(℃/℉) | Resistance(㏀) |
-20/-4 | 271.4 | 50/122 | 11 |
0/32 | 95.1 | 60/140 | 7.58 |
25/77 | 30 |
