FAN CONTROL MODULE INSPECTION [MZI-3.7]

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1. Connect the M-MDS to the DLC-2.

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2. Start and warm up the engine.

3. Monitor the engine coolant temperature with the M-MDS.

4. Measure the voltage between cooling fan motor connector (2 terminals) terminals A and B from the harness side as shown in the table.

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  • If not within the specification, inspect the input signals from the following parts.
    ― Cylinder Head Temperature (CHT) sensor
    ― Refrigerant pressure switch (middle)

Inspection | Result
--- | ---
Condition | A/C | Engine coolant temp.
IG SW ON or idling | OFF | Less than 96 °C {205 °F} | 0 V (Fan stops.)
Idling | OFF | 96—106 °C {205—223 °F} | 4.11—10.29 V
Idling | ON*1 | 96—106 °C {205—223 °F} | Approx. 6.6 V
Idling | ON*2 | 96—106 °C {205—223 °F} | Approx. 7.5 V
Idling | OFF | More than 106 °C {223 °F} | B+

*1 :Refrigerant pressure switch (middle) is off.
*2 :Refrigerant pressure switch (middle) is on.

5. If all the above parts are normal, replace the fan control module.