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Evaporator Temperature Sensor Inspection

NOTE:
  • Inspect the evaporator temperature sensor when it is installed to the A/C unit.
  1. Disconnect the negative battery terminal. (Refer to NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Remove the console side panel (passenger-side). (Refer to CONSOLE SIDE PANEL REMOVAL/INSTALLATION .)
  3. Remove the side wall (passenger-side). (Refer to SIDE WALL REMOVAL/INSTALLATION .)
  4. Connect the negative battery terminal. (Refer to NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  5. Switch the ignition ON (engine on).
  6. Set the fan speed to MAX HI.
  7. Set the temperature control to MAX COLD.
  8. Set to the RECIRCULATE mode.
  9. Turn the A/C switch off.
  10. Close all doors and windows.
  11. Wait for 5 min  .
  12. Switch the ignition off.
  13. Disconnect the negative battery terminal. (Refer to NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  14. Disconnect the evaporator temperature sensor connector. (Refer to EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION .)
  15. Measure the temperature at the blower inlet.
  16. Measure the resistance between the evaporator temperature sensor terminals A and B.
    Fig 1: Identifying Evaporator Temperature Sensor Connector Terminals
    G10948526Courtesy of MAZDA MOTORS CORP.
    • If the resistance is not as shown in the graph, replace the evaporator temperature sensor. (Refer to FRONT A/C UNIT DISASSEMBLY/ASSEMBLY .)
      Fig 2: Evaporator Temperature Sensor Resistance Graph
      G10948527Courtesy of MAZDA MOTORS CORP.
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