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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 233 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM 13B-MSP))ENGINE CONTROL SYSTEM OPERATION INSPECTIONCOOLING FAN CONTROL SYSTEM INSPECTIONCOOLING FAN SYSTEM OPERATION (AT IDLE)
2010 Mazda 5 Sport, 2.3 L, Standard
Cooling Fan System Operation (At Idle)
2010 Mazda 5 Sport, 2.3 L, StandardSECTION Cooling Fan System Operation (At Idle)
WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the WDS or equivalent to the DLC-2.
- Verify that DTC P0480 or P0481 is not displayed.
- If DTC P0480 and/or P0481 are displayed, perform DTC inspection.
- Access the ECT PID.
- Verify that the ECT PID is 97°C {208°F} or less.
- Verify that the A/C switch and fan switch are off.
- Start the engine and let it idle.
- Verify that the cooling fans are not operating.
- If the cooling fans are operating at low speed, inspect for the following:
- Cooling fan relay No. 1 (stuck closed)
- Wiring harnesses and connectors (cooling fan relay No. 1-PCM terminal 5X) (short to GND)
- If the cooling fan No. 1 is not operating, but cooling fan No. 2 is operating, inspect for the following:
- Cooling fan relay No. 3 (stuck closed)
- Wiring harnesses and connectors (cooling fan relay No. 3-PCM terminal 5AD) (short to GND)
- If the cooling fans are operating at low speed, inspect for the following:
- Warm up engine 97°C {208°F} or more
and verify that the cooling fans are operating at low speed.
- If cooling fans are not operating, inspect for the following:
- Cooling fan relay No. 1 (stuck open)
- Wiring harnesses and connectors (battery-cooling fan relay No. 1-cooling fan relay No. 2) (open)
- Wiring harnesses and connectors (main relay-cooling fan relay No. 1 PCM terminal 5X) (open)
- If cooling fan relay No. 1 is operating at high speed, inspect for the following:
- Cooling fan relay No. 2 (stuck close)
- If cooling fans are not operating, inspect for the following:
- Stop the engine.
- Disconnect the ECT sensor.NOTE:
- When the ECT sensor connector is disconnected, the PCM stores DTC P0118.
- Start the engine and let it idle.
- Verify that the cooling fans are operating at high speed.
- If the cooling fans are operating at low speed, inspect for the following:
- Cooling fan relay No. 2 (stuck open)
- Cooling fan relay No. 3 (stuck open)
- Wiring harnesses and connectors (open circuit at battery-cooling fan relay No. 3-cooling fan No. 2-GND)
- Wiring harnesses and connectors (open circuit at main relay-cooling fan relay No. 2-PCM terminal 5AD)
- Wiring harnesses and connectors (open circuit at main relay-cooling fan relay No. 3-PCM terminal 5AD)
- If cooling fan No. 1 is operating at high speed, but cooling fan No. 2 is not operating, inspect for the following:
- Cooling fan relay No. 3 (stuck open)
- Wiring harnesses and connectors (open circuit at main relay-cooling fan relay No. 3-PCM terminal 5AD)
- If cooling fan No. 1 is operating at high speed, but cooling fan No. 2 is not operating, inspect for the following:
- Cooling fan relay No. 3 (stuck open)
- Wiring harnesses and connectors (open circuit at main relay-cooling fan relay No. 2-PCM terminal 5AD)
- If the cooling fans are operating at low speed, inspect for the following:
- Clear the DTC from the PCM memory.
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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.