Faulty low-speed fan relay (failed contacts or coil); Corroded or loose relay socket terminals in the fuse box; Damaged wiring between the control unit and relay (open circuit or short to earth or power); Blown fuse or poor power supply to the relay; Failed fan motor or fan resistor drawing excess current and affecting the circuit; Internal fault in the engine control unit output driver.

P1475

Fan Relay Low Circuit.

Mazda
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
75: FaultThe specific fault in that area

What it means

On a Mazda, P1475 means a fault in the control circuit for the low-speed cooling fan relay. The engine control unit commands the relay on or off and monitors the circuit, and it set the code because the voltage it saw did not match what it commanded, which points to an open circuit, short or failed relay. The exact fan layout and relay location vary by model and engine, so check the wiring diagram for the vehicle.

Symptoms

Engine cooling fan not running at low speed or not running at all
Engine running hot or temperature gauge climbing in traffic
Fan running constantly after the ignition is switched on
Air conditioning performing poorly when stationary
Warning light on the dash with the fault code stored

Possible causes

Faulty low-speed fan relay (failed contacts or coil)likely
Corroded or loose relay socket terminals in the fuse boxlikely
Damaged wiring between the control unit and relay (open circuit or short to earth or power)possible
Blown fuse or poor power supply to the relaypossible
Failed fan motor or fan resistor drawing excess current and affecting the circuitpossible
Internal fault in the engine control unit output driverrare

How to diagnose

Read the stored codes and freeze frame data, note any other cooling or air conditioning codes, then check whether the code returns after clearing
Visually inspect the fan, relay box, wiring and connectors for heat damage, corrosion, chafing or water ingress
Check the fuses for the fan circuit and the relay supply voltage against the wiring diagram
Swap the fan relay with a known good relay of the same type, if the manufacturer's layout allows, and see if the fault moves
Command the fan on with a suitable scan tool test function and listen for the relay clicking and the fan running
Test the relay coil resistance and the control wire for continuity, short to earth and short to voltage with the control unit connector disconnected
Check the fan motor current draw and the fan connector for resistance or burnt terminals
Confirm the control unit has good power and earth supplies before suspecting the control unit itself

How to fix

Replace the faulty fan relay with the correct specification part
Clean or repair the relay socket terminals, or replace the socket or fuse box section if damaged
Repair or replace damaged wiring and connectors in the relay control circuit
Replace the blown fuse after finding and correcting the cause of the overload
Replace the fan motor or resistor if it is faulty and overloading the circuit
Repair or replace the control unit only once all wiring and supplies are proven good

Can I keep driving?

Medium severity

Short, careful trips may be possible if the temperature stays normal, but loss of cooling fan operation risks overheating and engine damage. Avoid slow traffic and long journeys, watch the temperature gauge, and stop at once if it rises.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.