The Air conditioner Control Module sets DTC B1238 when ambient temperature sensor signal is at or over 4.9V for 0.3 seconds.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Monitoring the Voltage | 1. Poor connection in wiring harness 2. Open in signal circuit 3. Short to battery in signal circuit 4. Open in ground circuit 5. Faulty ambient temperature sensor 6. Faulty A/C control Module |
Enable Conditions |
•
IG KEY 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℉) |
