Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [L3] - ENGINEENGINE CONTROL SYSTEM OPERATION INSPECTIONCOOLING FAN CONTROL SYSTEM INSPECTION
2010 Mazda 5 Sport, 2.3 L, Standard
Cooling Fan Control System Inspection
2010 Mazda 5 Sport, 2.3 L, StandardSECTION Cooling Fan Control System Inspection
- Verify that the battery voltage is more than 12.4 V
.
- If the battery voltage is less than 12.4 V , charge the battery or connect the external power supply.
- Connect the M-MDS and access ECT PID.
- Turn A/C switch to off.
- Verify ECT PID is less than 98°C {208°F}
.
- If ECT PID more than 98°C {208°F} , inspect ECT sensor and related wiring harnesses.
- Verify that the cooling fan does not operate with ECT PID is less than 98°C {209°F}
while the ignition switch is ON.
- If the cooling fan operates, inspect for following parts and related wiring harnesses:
- ECT sensor
- A/C switch
- A/C refrigerant pressure switch (High/low pressure)
- A/C refrigerant pressure switch (Medium pressure)
- VSS
- A/C magnetic clutch
- Fan control signal circuit (between fan control module terminal B and PCM terminal 1R)
- If the all items are normal, replace fan control module.
- If the cooling fan operates, inspect for following parts and related wiring harnesses:
- Verify the cooling fan operates while the A/C switch to ON with the ignition switch at ON position.
- If the cooling fan does not operate, inspect for following:
- A/C switch
- A/C refrigerant pressure switch (High/low pressure)
- Fan control module power supply circuit
- Fan control module GND circuit
- Fan control signal circuit (between fan control module terminal B and PCM terminal 1R)
- If the all items are normal, replace fan control module.
- If the cooling fan does not operate, inspect for following:
- Verify that the cooling fan operates with following table.COOLING FAN OPERATION CHART
PCM terminal 1R voltage B+ (off)(1) 0V (ON)(1) Cooling fan speed Middle speed High speed (1) A/C refrigerant pressure switch (medium pressure) condition - If the cooling fan operation is not specified, inspect for following:
- A/C refrigerant pressure switch (Medium pressure)
- If the A/C refrigerant pressure switch (Middle pressure) is normal, replace fan control module.
- A/C refrigerant pressure switch (Medium pressure)
- If the cooling fan operation is not specified, inspect for following:
- Turn A/C switch to off.
- Start the engine and idle it.
- Verify that the cooling fan operating speed increases relative to ECT PID increases.
- If the cooling fan speed does not increase inspect following:
- ECT sensor (characteristic)
- Fan control signal circuit (between fan control module terminal B and PCM terminal 1R)
- If the all items are normal, replace fan control module.
- If the cooling fan speed does not increase inspect following:
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.