Faulty high-speed fan relay (stuck, burnt contacts or failed coil); Blown fuse or fusible link in the fan relay power or control supply; Corroded, loose or damaged relay socket or wiring connector terminals; Open circuit or short to earth or power in the relay control wiring between the relay and the PCM; Failed cooling fan motor drawing excess current or leaving the circuit open; Internal fault in the PCM driver for the fan relay.

P1476

Fan Relay High Circuit.

Mazda
Powertrain
Manufacturer code
High severity

How this code is built

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

What it means

On a Mazda, P1476 means the powertrain control module has found a fault in the high-speed cooling fan relay circuit. The module monitors the control circuit for the relay and sets the code when the voltage or current it sees does not match what it commanded, such as an open circuit, a short or a relay that fails to respond. The exact fan layout and relay arrangement depend on the model and engine.

Symptoms

Engine temperature gauge climbing in traffic or at idle
Cooling fan not running at high speed, or running constantly
Air conditioning performing poorly when stationary
Engine overheating warning or coolant temperature warning
Check engine light on

Possible causes

Faulty high-speed fan relay (stuck, burnt contacts or failed coil)likely
Blown fuse or fusible link in the fan relay power or control supplylikely
Corroded, loose or damaged relay socket or wiring connector terminalslikely
Open circuit or short to earth or power in the relay control wiring between the relay and the PCMpossible
Failed cooling fan motor drawing excess current or leaving the circuit openpossible
Internal fault in the PCM driver for the fan relayrare

How to diagnose

Read the stored codes and freeze frame data, noting coolant temperature, vehicle speed and whether the air conditioning was on when the code set
Check for other cooling or electrical codes, and check the coolant level and condition before testing anything electrical
Visually inspect the fan relay, fuses, relay socket and connectors for heat damage, corrosion, water ingress or loose terminals
Command the fan on high using a scan tool's output test, or run the engine with the air conditioning on, and see whether the relay clicks and the fan responds
Check the relay and fuse feeds with a multimeter for battery voltage, and test the relay coil and contacts, or swap in a known good identical relay
Test the relay control wire for continuity, and for shorts to earth or power, between the relay socket and the PCM connector using the wiring diagram for that model
Check the fan motor current draw and connector condition if the relay and wiring prove good
Check battery and charging voltage, as low or erratic voltage can upset circuit monitoring

How to fix

Replace the faulty fan relay with the correct specification part
Replace any blown fuse once the cause of the overload has been found, such as a seized fan motor or a short
Clean or repair corroded terminals and replace damaged relay sockets or connectors
Repair or replace damaged wiring in the relay control or power circuit
Replace the cooling fan motor or fan assembly if it is shorted, seized or drawing excess current
Repair or replace the PCM only after wiring, relay and power supplies are proven good, following the manufacturer's procedure

Can I keep driving?

High severity

Avoid driving until the fan is confirmed working, as losing high-speed cooling can cause overheating and serious engine damage. If you must move the car, make a short trip only, keep an eye on 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.