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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
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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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