Engine Symptom Diagnosis - Suzuki Swift Sport 2004 Service & Repair Manual

Engine Symptom Diagnosis

Perform troubleshooting referring to the followings when ECM has detected no DTC and no abnormality has been
found in "Visual Inspection" and "Engine Basic Inspection".
Condition
Hard starting (Engine
cranks OK)
Low oil pressure
Engine noise – Valve
noise
NOTE
Before checking
mechanical noise, make
sure that:
• Specified spark plug is
used.
• Specified fuel is used.
Possible cause
Faulty spark plug
Leaky high-tension cord
Loose connection or disconnection of
high-tension cord(s) or lead wire(s)
Faulty ignition coil
Dirty or clogged fuel hose or pipe
Malfunctioning fuel pump
Air drawn in through intake manifold
gasket or throttle body gasket
Faulty electric throttle body assembly
Faulty APP sensor assembly
Faulty ECT sensor or MAF sensor
Faulty ECM
Low compression
Poor spark plug tightening or faulty
gasket
Compression leak from valve seat
Sticky valve stem
Weak or damaged valve springs
Compression leak at cylinder head
gasket
Sticking or damaged piston ring
Worn piston, ring or cylinder
Malfunctioning PCV valve
Camshaft position control (VVT) system
out of order
Faulty EGR system
Improper oil viscosity
Malfunctioning oil pressure switch
Clogged oil strainer
Functional deterioration of oil pump
Worn oil pump relief valve
Excessive clearance in various sliding
parts
Improper valve lash
Worn valve stem and guide
Weak or broken valve spring
Warped or bent valve
Engine General Information and Diagnosis:
Correction / Reference Item
"Spark Plug Inspection in Section 1H"
"High-Tension Cord Inspection in Section 1H"
"High-Tension Cord Removal and Installation
in Section 1H"
"Ignition Coil Assembly (Including ignitor)
Inspection in Section 1H"
"Fuel Pressure Check"
"Fuel Pressure Check"
"Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C"
"APP Sensor Assembly Inspection in Section
1C"
"ECT Sensor Inspection in Section 1C" or
"MAF and IAT Sensor Inspection in Section
1C"
"Compression Check in Section 1D"
"Spark Plug Removal and Installation in
Section 1H"
"Valves and Valve Guides Inspection in
Section 1D"
"Valves and Valve Guides Inspection in
Section 1D"
"Valve Spring Inspection in Section 1D"
"Cylinder Head Inspection in Section 1D"
"Cylinders, Pistons and Piston Rings
Inspection in Section 1D"
"Cylinders, Pistons and Piston Rings
Inspection in Section 1D"
"PCV Valve Inspection in Section 1B"
"Oil Control Valve Inspection in Section 1D"
"EGR System Inspection in Section 1B"
"Engine Oil and Filter Change in Section 0B"
"Oil Pressure Switch Inspection in Section 9C"
"Oil Pan and Oil Pump Strainer Cleaning in
Section 1E"
"Oil Pump Inspection in Section 1E"
"Oil Pump Inspection in Section 1E"
"Camshaft, Tappet and Shim Inspection in
Section 1D"
"Valves and Valve Guides Inspection in
Section 1D"
"Valve Spring Inspection in Section 1D"
"Valves and Valve Guides Inspection in
Section 1D"
1A-41
S7RS0B1104010