2018 / ECLIPSE CROSS / EC - Workshop Manual
55 -HEATER, AIR CONDITIONER AND VENTILATION > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > B1031 Air Thermo Sensor System
COMMENTS ON TROUBLE SYMPTOM
This code is set when the fin thermo sensor circuit is short (Code No.B1031) or is open (Code No.B1032).
PROBABLE CAUSES
- Malfunction of the fin thermo sensor
- Damaged wiring harness or connectors
- Malfunction of the A/C controller assembly (A/C-ECU)
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE data list
Check that the following service data display contents are normal (Refer to 
).Item No.2: Fin thermo sensor
Is the check result normal?
Go to Step 4.
Go to Step 2.
STEP 2. Check of open and short circuit in + and - line between fin thermo sensor and A/C controller assembly (A/C-ECU) connector.
Is the check result normal?
Go to Step 3. Repair the connector(s) or wiring harness.
STEP 3. Check the fin thermo sensor.
Is the check result normal?
Go to Step 4. Replace the fin thermo sensor.
STEP 4. Check whether the diagnosis code is set again.
