Honda Civic. Manual — part 307

ENGINE MECHANICAL

COOLING SYSTEM TROUBLE SHOOTING

COOLING SYSTEM TROUBLE SHOOTING

Brake pedal not returning freely

See DISC, DRUM

BRAKES BRAKE

SYSTEM

Brakes Grab or Uneven Braking Action

Malfunction of combination valve

See CONTROL

VALVE or BRAKE

SYSTEM

Malfunction of power brake unit

See POWER BRAKE

UNITS or BRAKE

SYSTEM

Binding brake pedal

See DISC, DRUM

BRAKES or BRAKE

SYSTEM

Pulsation or Roughness

Uneven pad wear caused by caliper

See DISC BRAKES or

BRAKE SYSTEM

Uneven rotor wear

See DISC BRAKES or

BRAKE SYSTEM

Drums out-of-round

Reface or replace

drums

NOTE:

This is GENERAL information. This article is not intended to
be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles
available in the section(s) you are accessing.

CONDITION & POSSIBLE CAUSE

CORRECTION

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

Overheating

Coolant Leak

Fill/Pressure Test

System

A/C Condenser Fins Clogged

Remove/Clean

Condenser

Radiator Fins Clogged

Remove/Clean

Radiator

Thermostat Stuck Closed

Replace Thermostat

Clogged Cooling System Passages

Clean/Flush Cooling

System

Water Pump Malfunction

Replace Water Pump

Fan Clutch Malfunction

Replace Fan Clutch

Retarded Ignition Timing

Reset Ignition Timing

Cooling Fan Malfunction

Test Cooling

Fan/Circuit

Cooling Fan Motor Malfunction

Test Fan Motor

Cooling Fan Relay Malfunction

Test Fan Relay

Faulty Radiator Cap

Replace Radiator Cap

Broken/Slipping Fan Belt

Replace Fan Belt

Restricted Exhaust

Repair Exhaust

System

Corrosion

Impurities In Coolant

Clean/Flush System

Coolant Leakage

Damaged hose

Replace Hose

Leaky Water Pump

Replace Water Pump

Damaged Radiator Seam

Replace/Repair

Radiator

Leaky Thermostat Cover

Replace Thermostat

Cover

Cylinder Head Problem

Check Head/Head

Gasket

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

GASOLINE ENGINE - MECHANICAL TROUBLE SHOOTING

BASIC GASOLINE ENGINE - MECHANICAL TROUBLE SHOOTING
CHART

Leaky Freeze Plugs

Replace Freeze Plugs

Recovery System Inoperative

Loose and/or Defective Radiator Cap

Replace Radiator Cap

Overflow Tube Clogged and/or Leaking

Repair Tube

Recovery Bottle Vent Restricted

Clean Vent

No Heater Core Flow

Collapsed Heater Hose

Replace Heater Hose

Plugged Heater Core

Clean/Replace Heater

Core

Faulty Heater Valve

Replace Heater Valve

NOTE:

This is GENERAL information. This article is not intended to
be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles
available in the section(s) you are accessing.

CONDITION & POSSIBLE CAUSE

CORRECTION

Engine Lopes At Idle

Intake manifold-to-head leaks

Replace manifold

gasket, See ENGINES

Blown head gasket

Replace head gasket,

See ENGINES

Worn timing gears, chain or sprocket

Replace gears, chain

or sprocket

Worn camshaft lobes

Replace camshaft, See

ENGINES

Overheated engine

Check cooling system,

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

See COOLING

Blocked crankcase vent valve

Remove restriction

Leaking EGR valve

Repair leak and/or

replace valve

Faulty fuel pump

Replace fuel pump

Engine Has Low Power

Leaking fuel pump

Repair leak and/or

replace fuel pump

Excessive piston-to-bore clearance

Install larger pistons,

See ENGINES

Sticking valves or weak valve springs

Check valve train

components, See

ENGINES

Incorrect valve timing

Reset valve timing,

See ENGINES

Worn camshaft lobes

Replace camshaft, See

ENGINES

Blown head gasket

Replace head gasket.

See ENGINES.

Clutch slipping

Adjust pedal and/or

replace components,

See ENGINES

Engine overheating

Check cooling system,

See COOLING

Auto. Trans. pressure regulator valve faulty

Replace pressure

regulator valve

Auto. Trans. fluid level too low

Add fluid as necessary

Improper vacuum diverter valve operation

Replace vacuum

diverter valve

Vacuum leaks

Inspect vacuum

system and repair as

required

Leaking piston rings

Replace piston rings,

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures