Diagnosis code 21, 22: Air thermo sensor system
COMMENTS ON TROUBLE SYMPTOM
This code is set when the air thermo sensor circuit is open (Code No.21) or is short (Code No.22).POSSIBLE CAUSES
- Malfunction of the air thermo sensor
- Damaged the wiring harness or connectors
- Malfunction of the automatic air conditioner control panel (A/C-ECU)
DIAGNOSIS
Step 3. Check the wiring harness between C-27 A/C-ECU connector (terminals 8 and 20) and C-316 air thermo sensor connector (terminals 1 and 2).
NOTE: Prior to the wiring harness inspection, check intermediate connector C-36 and heater water temperature sensor connector C-314, and repair if necessary.
- Check the input line for open or short circuit.
Q: Is the check result normal?
YES:
Replace the automatic air conditioner control panel (A/C-ECU)NO: Repair the wiring harness.