The A/C Control Module sets DTC B1238 if Ambient Temperature sensor signal is at or over 4.9V for 0.3 seconds.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage check | 1. Poor Connection in harness 2. Open in signal circuit 3. Short to battery in signal circuit 4. Faulty Ambient Temperature sensor 5. Faulty A/C control module |
Enable Conditions |
•
Ignition "ON" | |
Threshold value |
•
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℉) |
