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Fan Control Module Inspection

  1. Remove the charge air cooler duct. (See INTAKE AIR SYSTEM REMOVAL/INSTALLATION ).
  2. Connect the M-MDS to the DLC-2.
  3. Start and warm up the engine.
  4. Monitor the engine coolant temperature with the M-MDS.
    Fig 1: Identifying DLC-2 Connector
    G04859592Courtesy of MAZDA MOTORS CORP.
  5. Measure the voltage at terminal A of the fan control module connector (2 terminals) as shown in the table.
    • If not within the specification, inspect the input signals from the following parts.
      • Crankshaft Position (CKP) sensor
      • Engine Coolant Temperature (ECT) sensor
      • Throttle Position (TP) sensor
      • Refrigerant pressure switch (middle)
        Fig 2: Identifying Fan Control Module Connector (2 Terminals)
        G04859593Courtesy of MAZDA MOTORS CORP.

        Fan control module NO. 1 

        FAN CONTROL MODULE NO. 1 VOLTAGE REFERENCE CHART

        Inspection Result
        Condition A/C Engine coolant temp.
        IG SW ON OFF 95°C {203°F} or less 0 V (Fan stops.)
        IG SW ON (Idling) OFF 95°C {203°F} or less 0 V (Fan stops.)
        IG SW ON (Idling) ON(1) 95°C {203°F) or less 4.1 V
        IG SW ON (Idling) ON(2) 95°C {203°F} or less 6.2 V
        IG SW ON (Idling) OFF 100°C {212°F} or more 4.1-14.6 V
        (1) Refrigerant pressure switch (middle) is off.
        (2) Refrigerant pressure switch (middle) is on.

        Fan control module NO. 2 

        FAN CONTROL MODULE NO. 2 VOLTAGE REFERENCE CHART

        Inspection Result
        Condition A/C Engine coolant temp.
        IG SW ON OFF 95°C {203°F} or less 0 V (Fan stops.)
        IG SW ON (Idling) OFF 95°C {203°F} or less 0 V (Fan stops.)
        IG SW ON (Idling) ON(1) 95°C {203°F} or less 5.5 V
        IG SW ON (Idling) ON(2) 95°C {203°F} or less 10.3 V
        IG SW ON (Idling) OFF 100°C {212°F} or more 4.1-14.6 V
        (1) Refrigerant pressure switch (middle) is off.
        (2) Refrigerant pressure switch (middle) is on.
  6. If all the above parts are normal, replace the fan control module.
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