2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

Engine Compartment

G13714265Courtesy of MAZDA MOTORS CORP.
PART DESCRIPTION

1 Ion sensor
(See ION SENSOR REMOVAL/INSTALLATION .)
(See ION SENSOR INSPECTION .)
2 Intake CMP sensor
(See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION .)
(See CAMSHAFT POSITION (CMP) SENSOR INSPECTION .)
3 Coolant control valve position sensor
(See COOLANT CONTROL VALVE POSITION SENSOR REMOVAL/INSTALLATION .)
(See COOLANT CONTROL VALVE POSITION SENSOR INSPECTION .)
4 MAF sensor/IAT sensor No. 1
(See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION .)
(See MASS AIR FLOW (MAF) SENSOR INSPECTION .)
(See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION .)
5 PCM (BARO sensor)
(See PCM REMOVAL/INSTALLATION .)
(See PCM INSPECTION .)
(See BAROMETRIC PRESSURE (BARO) SENSOR REMOVAL/INSTALLATION .)
(See BAROMETRIC PRESSURE (BARO) SENSOR INSPECTION .)
6 Engine oil level sensor
(See ENGINE OIL LEVEL SENSOR REMOVAL/INSTALLATION .)
(See ENGINE OIL LEVEL SENSOR INSPECTION .)
7 TP sensor
(See THROTTLE POSITION (TP) SENSOR REMOVAL/INSTALLATION .)
(See THROTTLE POSITION (TP) SENSOR INSPECTION .)
8 MAP sensor/IAT sensor No. 2
(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 2 REMOVAL/INSTALLATION .)
(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION .)
(See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION .)
9 KS
(See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
(See KNOCK SENSOR (KS) INSPECTION .)
10 Fuel pressure sensor
(See FUEL PRESSURE SENSOR REMOVAL/INSTALLATION .)
(See FUEL PRESSURE SENSOR INSPECTION .)
11 Revolution sensor
(See REVOLUTION SENSOR INSPECTION .)
12 Neutral sensor
(See NEUTRAL SENSOR INSPECTION .)
Factory Service Tools

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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.

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