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 MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 490 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM BP, BP WITH TC))ENGINE CONTROL SYSTEM OPERATION INSPECTIONCOOLING FAN CONTROL OPERATION INSPECTION (BP WITH TC)

2008 Mazda 6 s Sport, 4D Hatchback, Standard

Cooling Fan Control Operation Inspection (BP WITH TC)

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Cooling Fan Control Operation Inspection (BP WITH TC)

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

Connect the WDS or equivalent to DLC-2.
Access the ECT PID.
Verify that the ECT PID is below 100°C {212°F}
Verify that the fan motor No.1 and No.2 do not operate.
- If the cooling fans are operating, inspect for following:
  - Short to GND circuit in wiring between A/C switch and PCM terminal 4F
  - Short to GND circuit in wiring between fan relay No.1 and PCM terminal 2B
  - Short to GND circuit in wiring between fan relay No.2 and PCM terminal 2C
  - Short to GND circuit in wiring between fan relay No.3 and PCM terminal 2C
  - Fan relay No.1 stuck close
Start the engine and warm up it to ECT PID is above 100°C {212°F}
Verify that fan motor No.1 and No.2 operate.
- If the fan motor No.1 and No.2 do not operate inspect for following:
  - Open circuit in wiring between PCM terminal 2B and fan relay No.1
  - Open circuit in wiring between battery positive terminal and fan relay No.1
  - Fan relay No.1 stuck open
- If the fan motor No.1 does not operate inspect for following:
  - Open circuit between fan relay No.1 and GND through fan motor No.1
  - Fan motor No.1 malfunction
- If the fan motor No.2 does not operate inspect for following:
  - Open circuit between fan relay No.3 and GND through fan motor No.2
  - Fan motor No.2 malfunction
Verify that the fan motor No.1 and No.2 operate high speed while the A/C is operating.
- If the fan motor No.1 and No.2 do not operate high speed, inspect for following:
  - Open circuit between A/C switch and PCM terminal 4F
  - Open circuit between PCM terminal 2C and fan relay No.2
  - Open circuit between PCM terminal 2C and fan relay No.3
  - Open circuit between battery positive terminal and fan relay No.2
  - Open circuit between battery positive terminal and fan relay No.3
  - Open circuit between fan relay No.2 and GND
  - Fan relay No.2 stuck open
  - Fan relay No.3 stuck open
- If the fan motor No.1 does not operate high speed, inspect for following:
  - Open circuit between fan relay No.2 and fan motor No.1
  - Open circuit between fan relay No.3 and fan motor No.1
  - Fan motor No.1 malfunction
- If the fan motor No.2 does not operate high speed, inspect for following:
  - Open circuit between fan relay No.2 and fan motor No.2
  - Open circuit between fan relay No.3 and fan motor No.2
  - Fan motor No.2 malfunction

RENDER: 1.0x

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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.