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Home >> Mazda >> 2024 >> 3 S >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Control System - Auto A/C >> Evaporator Temperature Sensor Inspection >> Function Inspection

Function Inspection

  1. Perform the following procedure so that the ambient temperature of the evaporator temperature sensor is close to the cabin temperature.
    • Switch the ignition ON (engine on).
    • Set airflow volume to maximum.
    • Set the temperature to MAX COLD.
    • Turn the A/C switch off.
    • Set the air intake mode to REC.
    • Fully close all the doors and the door glass.
    • Leave for 5 min.
  2. Connect the M-MDS to the DLC-2.
  3. Switch the ignition ON (engine off).
  4. Display the dash-electrical supply unit PIDs [EVA_TMP] and [AMB_TEMP_INTERNAL]. (Refer to [ PID/DATA MONITOR INSPECTION in the service information) (Refer to PID/DATA MONITOR TABLE [DASH_ESU] ] in the service information)
  5. Compare the temperature displays of the PIDs [EVA_TMP] and [AMB_TEMP_INTERNAL].
    • If the temperature displays of the PIDs [EVA_TMP] and [AMB_TEMP_INTERNAL]. do not match, perform the procedure from Step 6.
  6. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  7. Remove the following parts.
    1. Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .)
    2. Side wall (passenger-side). (See SIDE WALL REMOVAL/INSTALLATION .)
  8. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  9. Perform the following procedure so that the ambient temperature of the evaporator temperature sensor is close to the cabin temperature.
    • Switch the ignition ON (engine on).
    • Set airflow volume to maximum.
    • Set the temperature to MAX COLD.
    • Turn the A/C switch off.
    • Set the air intake mode to REC.
    • Fully close all the doors and the door glass.
    • Leave for 5 min.
  10. Measure the temperature of the air intake port.
    G14582360Courtesy of MAZDA MOTORS CORP.
  11. Connect the M-MDS to the DLC-2.
  12. Switch the ignition ON (engine off).
  13. Display the dash-electrical supply unit PID [EVA_TMP]. (Refer to [ PID/DATA MONITOR INSPECTION in the service information) (Refer to PID/DATA MONITOR TABLE [DASH_ESU] ] in the service information)
  14. Compare the measured temperature with the temperature display of the dash-electrical supply unit PID [EVA_TMP].
    • If it does not match the measured temperature, perform the resistance inspection. (See RESISTANCE INSPECTION .)
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