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Subaru Impreza 2004 User Manual

Subaru Impreza 2004
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FUJI HEAVY INDUSTRIES LTD. G1870GE2
2004 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX
ENGINE SECTION 1
This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.
All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.
FUEL INJECTION (FUEL SYSTEMS) FU(H4SO)
EMISSION CONTROL
(AUX. EMISSION CONTROL DEVICES)
EC(H4SO)
INTAKE (INDUCTION) IN(H4SO)
MECHANICAL ME(H4SO)
EXHAUST EX(H4SO)
COOLING CO(H4SO)
LUBRICATION LU(H4SO)
SPEED CONTROL SYSTEMS SP(H4SO)
IGNITION IG(H4SO)
STARTING/CHARGING SYSTEMS SC(H4SO)
ENGINE (DIAGNOSTICS) EN(H4SO)(diag)
FUEL INJECTION (FUEL SYSTEMS) FU(H4SOw/oOBD)
EMISSION CONTROL
(AUX. EMISSION CONTROL DEVICES)
EC(H4SOw/oOBD)
INTAKE (INDUCTION) IN(H4SOw/oOBD)
MECHANICAL ME(H4SOw/oOBD)
EXHAUST EX(H4SOw/oOBD)
COOLING CO(H4SOw/oOBD)

Table of Contents

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Subaru Impreza 2004 Specifications

General IconGeneral
BrandSubaru
ModelImpreza 2004
CategoryAutomobile
LanguageEnglish

Summary

Fuel Injection (Fuel Systems)

Fuel Injector

Provides detailed removal and installation procedures for fuel injectors on RH and LH sides, including O-ring replacement.

Engine Control Module (ECM)

Covers the removal and installation of the ECM, including cautions regarding correct specification and torque.

Fuel

Covers fuel pressure release, draining fuel procedures, and fuel drain plug tightening torque.

Fuel Tank

Explains the removal and installation of the fuel tank, including cautions and helper requirements.

Fuel Pump

Covers the removal and installation of the fuel pump assembly, including warnings and inspection procedures.

Fuel Filter

Explains the removal, installation, and inspection of the fuel filter, including cautions for hose and clamp condition.

Fuel System Trouble in General

Provides a diagnostic table for fuel system troubles, listing symptoms, problem parts, possible causes, and corrective actions.

Emission Control (Aux. Emission Control Devices)

Intake (Induction)

Mechanical

Timing Belt

Details the components and tightening torques for the timing belt system, including covers, pulleys, and tensioner.

Cylinder Head and Camshaft

Explains the assembly of the cylinder head and camshaft, including component identification and tightening torques.

Crankshaft and Piston

Details the components of the crankshaft and piston assembly, including tightening torques for bolts and bearings.

Engine Trouble in General

Provides a table of common engine troubles, their possible causes, and corrective actions, with priority rankings.

Compression

Details the procedure for inspecting engine compression, including standard and limit values.

Engine Oil Pressure

Details the procedure for inspecting engine oil pressure, including cautions and recommended oil temperature.

Fuel Pressure

Covers the procedure for measuring fuel pressure, including warnings and notes on high-altitude operations.

Valve Clearance

Explains the inspection and adjustment of valve clearance, emphasizing engine cold state and specific procedures.

Engine Assembly

Provides detailed procedures for engine assembly and removal, including refrigerant discharge and fuel pressure release.

Timing Belt Assembly

Explains the removal and installation of the timing belt assembly, including alignment marks, tensioner, and inspection.

Camshaft

Covers the removal, installation, and inspection of the camshaft, including oil seal and gasket replacement.

Cylinder Head Assembly

Details the removal and installation of the cylinder head assembly, including gasket replacement and torque specifications.

Cylinder Block

Explains the removal and installation procedures for the cylinder block, including piston and ring measurements.

Exhaust

Cooling

Water Pump

Details the removal, installation, and inspection of the water pump, including gasket replacement and tightening torques.

Radiator and Radiator Fan

Explains the components and tightening torques for the radiator and fan system, including ATF hoses and drain plug.

Engine Coolant

Covers the replacement procedure for engine coolant, including draining, filling, and capacity specifications.

Engine Cooling System Trouble in General

Provides a diagnostic table for engine cooling system troubles, listing symptoms, possible causes, and corrective actions.

Lubrication

Oil Pump

Details the removal, installation, disassembly, assembly, and inspection of the oil pump and its components.

Engine Oil Filter

Details the removal and installation of the engine oil filter, including cleaning and tightening procedures.

Engine Lubrication System Trouble in General

Provides a diagnostic table for engine lubrication system troubles, listing symptoms, causes, and corrective actions.

Speed Control Systems

Accelerator Pedal

Details the removal, installation, disassembly, assembly, and inspection of the accelerator pedal.

Ignition

General Description

Provides specifications for ignition components like coil, ignitor, and spark plugs, including resistance values.

Starting/Charging Systems

General Description

Provides specifications for starter, generator, and battery systems, including model designations and voltage outputs.

Engine (Diagnostics)

Basic Diagnostic Procedure

Outlines the fundamental diagnostic procedure for engine starting failures, including checks for engine start and malfunction indicator light.

Diagnostics for Engine Starting Failure

Provides diagnostic procedures for engine starting failures, covering starter motor, ECM, ignition, fuel pump, and fuel injector circuits.

List of Diagnostic Trouble Code (DTC)

A comprehensive list of Diagnostic Trouble Codes (DTCs) with corresponding items, contents of diagnosis, and index references.

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