01
Engine & identification
Vehicle identification
No. of cylinders Type 4/DOHC Capacity (Fiscal) cc 2261 Compression ratio :1 10,6 Suitable for unleaded petrol Yes Minimum octane rating RON 91 Ignition system Make Mazda Ignition system Description Map-DIS Trigger location Cam/Crankshaft Fuel system Make Mazda Fuel system Type EGI Fuel system Description MFI-s Air metering Type Mass/MAP Combined ignition and fuel ECM Yes Diagnostic socket Yes
Ignition system
Ignition coil Make Mazda Ignition coil supply voltage + with ballast V 12,0 Primary resistance Ohm 0,49-0,57 Secondary resistance Ohm 9500-11100 Distributor (ECM) Make (Mazda)
Firing order
The firing order for the Mazda 6 2.3 (2002–2005) is 1-3-4-2 .
Valve clearances
Valve clearances for the Mazda 6 2.3 (2002–2005) are 0,22-0,28 mm inlet and 0,27-0,33 mm exhaust, measured cold.
Valve clearance - INLET mm 0,22-0,28 cold Valve clearance - EXHAUST mm 0,27-0,33 cold
02
Engine oil & fluids
Engine oil
See the reference table for the complete engine oil entries and their conditions.
Manual gearbox
See the reference table for the complete manual gearbox entries and their conditions.
Coolant
The listed total cooling-system capacity is 7.5 litres.
Grades, filling conditions and capacities
Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range
➞40°C
Engine oil grade SAE
5W-30
Engine oil classification API/ACEA
SL/A3, A5
Ambient temperature range
-25°C➞45°C
Engine oil grade SAE
10W-40
Engine oil classification API/ACEA
SL/A3
Engine with filter(s) litres
—
View more information
—
Other lubricants and capacities
Manual transmission oil grade SAE
—
Manual transmission oil grade
Manual transmission litres
2,9 6sp=3,0
Automatic transmission fluid Type
—
Automatic transmission fluid
Automatic transmission (drain & refill) litres
8.14
Cooling system - total capacity litres
7.5
Brake fluid Type
DOT 3/4
Power steering fluid Type
Dexron II
Power steering fluid litres
0,8 AT=0,9
03
Brakes & wear limits
Brake disc thickness
Brake discs on the Mazda 6 2.3 (2002–2005) are replaced at a minimum thickness of 22 mm (ventilated) front and 8 mm rear.
Minimum disc thickness for replacement - ventilated Front 22 mm Minimum disc thickness for replacement Rear 8 mm
Brake disc and drum dimensions
Minimum disc thickness Disc thickness variation Front 0,015 mm Disc thickness variation Rear 0,015 mm Disc runout Front 0,05 mm Disc runout Rear 0,05 mm Minimum pad thickness Front 2 mm Minimum pad thickness Rear 2 mm Parking brake travel No. of notches 3-6
04
Service & electrical
Battery
The Mazda 6 2.3 (2002–2005) uses a 12 V, 75 Ah battery.
Tuning and emissions
Ignition timing - basic BTDC °Engine/rpm 10±2/650 Not adjustable Ignition advance checks °Engine/rpm ECM Controlled Idle speed rpm 650±50 Not adjustable Oil temperature °C 80 CO level at idle speed - tailpipe Vol. % CO 0,5 Max Not adjustable HC level at idle speed ppm 100 CO2 level at idle speed Vol. % CO2 14,5-16 O2 level at idle speed Vol. % O2 0,1-0,5 Increased idle speed for CO test rpm 2500-2800 CO content at increased idle speed Vol. % 0,3 Lambda at increased idle λ 0,97-1,03
Starting and charging
Alternator output A/V/rpm 90/12/2000
Service checks and adjustments
Compression pressure bar 10,2-14,3 Oil pressure bar/rpm 3,9-6,4/3000 Radiator cap bar 1,10-1,40 Thermostat opens °C 97
Fuel system
System pressure bar 3,9-4,5 Engine coolant temperature (ECT) sensor Ohm/°C 5070-5600/70 Crankshaft position (CKP) sensor/engine speed (RPM) sensor Ohm 400-500 Injector Ohm 11,4-12,6 Lambda sensor (Oxygen) heater Ohm —
Spark plugs
Spark plugs Original equipment NGK Spark plug Type ITR6F-13 Spark plugs Make NGK Spark plug Type ITR6F-13
05
Tightening torques
Cylinder head bolt torque
The cylinder head bolts on the Mazda 6 2.3 (2002–2005) are tightened in 3 stages: 5 Nm, then 13-17 Nm, then a final 44-46 Nm .
Cylinder head Maximum bolt length 150,5 mm Tighten 5 Nm Tighten 13-17 Nm Tighten 44-46 Nm Tighten 90±2° Tighten 90±2°
Cylinder head instructions —
Other engine tightening torques Main bearings Stage 1 — View more information —
Main bearings Big end bearings Renew bolts/nuts — View more information —
Big end bearings Big end bearings Stage 1 29±3 Nm Big end bearings Stage 2 90°±10° Oil pump to cylinder block 20-25 Nm Sump bolts —
Sump bolts Sump drain bolt 26±4 Nm Flywheel/driveplate 112±4 Nm
Bolts/nuts Clutch pressure plate 22±4 Nm Crankshaft pulley/damper centre bolt 100±4 Nm+90° Camshaft sprocket/gear 92±3 Nm
Camshaft sprocket/gear Camshaft carrier/cap 15±1 Nm Camshaft/rocker cover 9±1 Nm Inlet manifold to cylinder head 10±1 Nm Exhaust manifold to cylinder head 54±10 Nm Exhaust downpipe to manifold 45±7 Nm Water pump 10±2 Nm Spark plugs 12±2 Nm Fuel rail 25±5 Nm Crankshaft position (CKP) sensor/engine speed (RPM) sensor 7±1 Nm Camshaft position (CMP) sensor 7±1 Nm Engine coolant temperature (ECT) sensor 12±2 Nm Lambda sensor (Oxygen) 39±10 Nm Knock sensor (KS) 20±4 Nm Engine oil pressure switch 15±3 Nm Oil filter —
Chassis tightening torques Front hub 255±20 Nm
Bolts/nuts Rear hub —
Rear hub Steering wheel 44±5 Nm
Bolts/nuts Steering rack/box mounting 90±15 Nm Steering track rod end 37±3 Nm Brake disc to hub Front 12±3 Nm Brake caliper to carrier Front 52±2 Nm
Brake caliper to carrier Brake caliper/carrier to hub Front 90±12 Nm Brake disc to hub Rear 12±3 Nm Brake caliper to carrier Rear 43±6 Nm Brake caliper/carrier to hub Rear 59±8 Nm ABS sensor Front 22±3 Nm ABS sensor Rear 22±3 Nm Road wheels 103±15 Nm
06
Air conditioning
No. of AC service connectors 2 Air conditioning restrictor type Expansion valve Compressor clutch/magnetic coupling Yes Compressor variable displacement solenoid No Air conditioning refrigerant Type R134a Air conditioning refrigerant quantity grams —
Refrigerant quantity Air conditioning oil group PAG Air conditioning oil Type Atmos GU 10 Air conditioning oil quantity cm³ 120 Air conditioning oil viscosity ISO 46
Frequently asked questions What is the firing order of the Mazda 6 2.3? The firing order for the Mazda 6 2.3 (2002–2005) is 1-3-4-2.
How much oil does the Mazda 6 2.3 take? See the reference table for the complete engine oil entries and their conditions.
What are the valve clearances for the Mazda 6 2.3? Valve clearances for the Mazda 6 2.3 (2002–2005) are 0,22-0,28 mm inlet and 0,27-0,33 mm exhaust, measured cold.
What is the cylinder head torque for the Mazda 6 2.3? The cylinder head bolts on the Mazda 6 2.3 (2002–2005) are tightened in 3 stages: 5 Nm, then 13-17 Nm, then a final 44-46 Nm.
What is the minimum brake disc thickness for the Mazda 6 2.3? Brake discs on the Mazda 6 2.3 (2002–2005) are replaced at a minimum thickness of 22 mm (ventilated) front and 8 mm rear.
What battery does the Mazda 6 2.3 use? The Mazda 6 2.3 (2002–2005) uses a 12 V, 75 Ah battery.
Note: Specifications are workshop reference data for the Mazda 6 2.3 (2002–2005). Always confirm against your vehicle's VIN plate and service book.