2012 Mazda 3 Service and Repair Manual

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Covers all 2012 3 trims — GS-SKY Sedan 4-Door, i Hatchback 4-Door, I Touring Sedan 4-Door +8 more ·
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2012 Mazda 3 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Electrical diagnostics with wiring diagrams
  • Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more

Trims covered

  • GS-SKY Sedan 4-Door
  • i Hatchback 4-Door
  • I Touring Sedan 4-Door
  • i Sedan 4-Door
  • S Hatchback 4-Door
  • GS Sedan 4-Door
  • GT Sedan 4-Door
  • S Sedan 4-Door
  • Mazdaspeed Hatchback 4-Door
  • GX Sedan 4-Door
  • Grand Touring Hatchback 4-Door

Engines covered

  • 2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
  • 2.0L 2000CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
  • 2.0L 1999CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
  • 2.5L 2488CC 152Cu. In. l4 GAS DOHC Naturally Aspirated
  • 2.3L 2260CC l4 GAS DOHC Turbocharged

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams
NHTSA #16V64400006/09/2016Component: STRUCTURE:BODY:HATCHBACK/LIFTGATE

Mazda North American Operations (Mazda) is recalling certain model year 2010-2013 Mazda3 and Mazdaspeed3 vehicles manufactured November 18, 2008, to June 8, 2013, 2012-2015 Mazda5 vehicles manufactured October 26, 2010, to June 22, 2015, 2016 CX-3 vehicles manufactured June 1, 2015, to December 26, 2015, and 2013-2016 CX-5 vehicles manufactured December 15, 2011, to December 26, 2015. On the affected vehicles, the lift gate support struts may corrode, possibly causing the struts to break and/or the lift gate to drop unexpectedly.

Consequence

If the lift gate falls unexpectedly, it may hit the user, increasing their risk of injury.

Remedy

Mazda dealers will replace the both lift gate supports, free of charge, however parts are not currently available. The recall began April 2017. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 9916H.

TSB #11032103

This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance services that support all ma

TSB #11026917

If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarke

TSB #11026904

A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling unit which is

TSB #11026347

There have been warranty claims submitted for growling or bearing whine noise in differentials, transfer units and transmissions where the source of the noise was a wheel bearing. This misdiagnosis can lead to multiple repair attempts, warr

TSB #11024999

For improvement of electrical diagnosis, the SKYACTIV Wiring Terminal Test Kits has been delivered all the dealers. The terminal test kit enables you: To check pin fit drag of all PCM terminals used in SKYACTIV vehicles and compare suspect

TSB #11022742

Some vehicles may experience exterior trim heat damage such (melted, separating, etc.) when parked near a glass building or Low-E windows. This may be caused by the sun's reflection. If a structure's windows create enough of a curve, the co

TSB #11022727

When replacing the SiriusXM satellite radio unit, a call must be made to inform SiriusXM of the existing Radio ID and the new/replacement SAT Radio ID as soon as possible to ensure the customer leaves the dealership with an active SAT radio

TSB #11020039

Some customers may complain about a noisy HVAC blower motor or odor after a cabin air filter replacement. Foreign debris on the blower motor after servicing the cabin air filter may be the cause. During the removal of the cabin air filter,

Showing the 8 most recent of 333 technical service bulletins on file with NHTSA.

08/31/20Component: SERVICE BRAKESCrash reported2 injured

I was coming up on a car waiting to make a left turn. While attempting to move to the right-hand passing lane, five lights lit up and the power steering went out. The five lights were "Power Steering Malfunction Indicator Light", "TSC/DSC Off Indicator Light", "Security Light", "ABS Warning Light", and "Seatbelt Warning Light" (even though my seat belt was on and buckled). Realizing I could not turn in time, I attempted to stop instead and could not stop in time to avoid striking the other vehicle. There had been no indication of problems with any of the indicated systems prior to this inc

08/10/20Component: AIR BAGSCrash reported2 injured

WAS INVOLVED IN AN ACCIDENT IN APRIL 2017 HIT FROM THE BACK AND PUSH INTO ANOTHER VEHICLE THE AIRBAGS DID NOT DEPLOY BUT THE LIGHT CAME ON AND WAS FLASHING EVERY SINCE THEN. WE WERE SITTING STILL AT A STOP WHEN WE GOT REAR ENDED AND PUSH INTO ANOTHER VEHICLE.

10/25/20Component: VEHICLE SPEED CONTROLCrash reported1 injured

TL* THE CONTACT OWNS A 2012 MAZDA MAZDA3. THE CONTACT STATED THAT WHEN DRIVING APPROXIMATELY 5 MPH AND PULLING INTO HER DRIVEWAY THE ACCELERATOR PEDAL GOT JAMMED AND AS A RESULT THE CONTACT CRASHED INTO HER GARAGE. THE DRIVER SUSTAINED INJURIES TO HER UPPER BACK AND NECK. THE POLICE WERE NOT CONTACTED. THE DEALER WAS LATER CONTACTED AND THEY OFFERED NO ASSISTANCE. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE WHO THEY ADVISED HER THAT THEY WOULD LOOK INTO THE ISSUE. THE VEHICLE WAS NOT REMOVED FROM THE CONTACTS GARAGE. THE FAILURE AND CURRENT MILEAGE WAS APPROXIMATELY 700.

07/19/20Component: ELECTRICAL SYSTEMFire reported

The contact owned a 2012 Mazda Mazda3. The contact stated that while the vehicle was parked, the contact woke up to the fire department extinguishing a fire in the vehicle. The fire department stated that the fire began under the hood and that the fire was due to the electrical system. The vehicle was deemed totaled by the insurance company. A police report and a fire report were filled out. The vehicle has not been towed yet. The manufacturer was not made aware of the failure. The failure mileage was approximately 160,000.

09/14/20Component: SEATSCrash reported

MY MAZDA3 HAS EXPERIENCED THE SAME MANUAL SEAT LIFTER FAILURE ISSUE AS ADDRESSED IN NHTSA RECALL 17V-082. I WAS INVOLVED IN A REAR END COLLISION ON SEPTEMBER 8, 2020 WHICH CAUSED ME TO EXPERIENCE WHIPLASH DUE TO THE SEAT BECOMING LOOSE. THE COLLISION CENTER FOUND THE SEAT IS MISSING THE PUSH NUTS AND THE LIFT BRACKET HAS BROKEN AT THE WELDS WHICH IS IDENTICAL DUE TO SAFETY ISSUES STATED IN THE ABOVE RECALL. MAZDA STATES THIS IS NOT AN ISSUE FOR THIS VEHICLE BUT I COULD HAVE BEEN SEVERELY INJURED DUE TO THIS. MY CAR WAS GOING SLOWLY BEFORE I WAS HIT FROM BEHIND WHICH PUSHED THE CAR FORWARD

02/14/20Component: VEHICLE SPEED CONTROLCrash reported

I APPLIED THE BRAKES, AND THE CAR KEPT MOVING FORWARD EVEN THOUGH I WAS PRESSING THE BRAKE PEDAL. I PULLED THE EMERGENCY BRAKE BUT THAT DIDN'T STOP THE CAR FROM MOVING FORWARD AND HITTING THE BACK OF THE TRUCK IN FRONT OF ME. I WAS ON A HIGHWAY.

11/14/20Component: UNKNOWN OR OTHERCrash reported

MY CAR IS AUTOMATIC, AND I HAD PULLED INTO A PARKING LOT OFF THE STREET IN FRONT OF A STORE, AND WAS TURNING RIGHT INTO THE PARKING SPOT, AND WAS PUTTING ON THE BRAKE, THE CAR SURGED, AND WENT FORWARD, STILL AS I AM PRESSING ON THE BREAK, AND WENT THROUGH A STORE WINDOW. THEN ONCE IT STOPPED INSIDE THE STORE I PUT IT IN PARK, AND STARTED TO TAKE MY FOOT OFF THE BREAK, AND IT STARTED TO MOVE FORWARD, SO I PUT ON THE BREAK AGAIN. THEN TRIED IT AGAIN, TAKING MY FOOT OFF THE BRAKE, AND IT MOVED AGAIN A BIT, AND STOPPED. SO I TURNED OFF THE CAR.

07/19/20Component: STEERING,SUSPENSION,SEATSCrash reported

MY CAR WAS T-BONE, IT SHOULD NOT HAVE BEEN DRIVEN. MY DAUGHTER WAS MADE TO DRIVE THE DAMAGED CAR HOME INSTEAD OF USING A TOW TRUCK TO TAKE IT TO THE NEAREST BODY SHOP. THE SUSPENSION WAS BENT COMPLETELY INWARDS (DOUGHNUT TIRE WAS USED TO DRIVE THE CAR HOME WITH A BENT SUSPENSION). I WAS TOLD BY THE INSURANCE COMPANY TO DRIVE THE CAR TO THE NEAREST SHOP THEY DO BUSINESS WITH, AND I DID. I ASKED THE SUPERVISOR/ADJUSTER TO TOTAL THE CAR BEFORE EVER SEEING THE INTERNAL DAMAGE. I KNEW THE CAR COULD NOT BE REPAIRED BACK TO THE WAY IT WAS, ALMOST NEW CONDITION. WE WENT BACK AND FORWARD ABOUT TOTALIN

Showing the 8 most serious of 226 complaints filed with NHTSA.

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