2000 SUZUKI SWIFT Spark plug

6-26 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
ConditionPossible CauseReferring Item
Engine has no
powerIgnition system out of order

Faulty spark plug

Faulty ignition coil with ignitor

Leaks, loose connection or disconnection of
high-tension cord
Engine overheating
Fuel system out of order

Clogged fuel hose or pipe

Malfunctioning fuel pump

Air inhaling from intake manifold gasket or
throttle body gasket
Engine and emission control system out of
order

Maladjusted accelerator cable play

Poor performance of TP sensor, ECT sensor or
MAP sensor

Faulty fuel injector

Faulty ECM (PCM)
Low compression
Others

Dragging brakes

Slipping clutch
Spark plugs in Section 6F
Ignition coil in Section 6F
High-tension cords in Section 6F
Refer to “Overheating” section
Diagnostic Flow Table B-3 in
Section 6
Diagnostic Flow Table B-2
Accelerator cable play in Section
6E1
TP sensor, ECT sensor or MAP
sensor in Section 6E1
Diagnostic Flow Table B-1
Previously outlined
Trouble diagnosis in Section 5
Trouble diagnosis in Section 7C

ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-27
ConditionPossible CauseReferring Item
Improper engine
idling or engine
fails to idleIgnition system out of order

Faulty spark plug

Leaky or disconnected high-tension cord

Faulty ignition coil with ignitor
Fuel system out of order

Fuel pressure out of specification

Leaky manifold, throttle body, or cylinder head
gasket
Engine and emission control system out of
order

Faulty idle control system

Faulty evaporative emission control system

Faulty fuel injector

Faulty fuel injector resistor

Poor performance of ECT sensor, TP sensor or
MAP sensor

Faulty ECM (PCM)
Engine overheating
Low compression
Others

Loose connection or disconnection of vacuum
hoses

Malfunctioning PCV valve
Spark plugs in Section 6F
High-tension cords in Section 6F
Ignition coil in Section 6F
Diagnostic Flow Table B-3 in
Section 6
Diagnostic Flow Table P0505
EVAP control system in Section
6E
Diagnostic Flow Table B-1
Fuel injector resistor in Section 6E1
ECT sensor, TP sensor or MAP
sensor in Section 6E1
Refer to “Overheating” section
Previously outlined
PCV system in Section 6E1

6-28 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
ConditionPossible CauseReferring Item
Excessive
hydrocarbon (HC)
emission or carbon
monoxide (CO)Ignition system out of order

Faulty spark plug

Leaky or disconnected high-tension cord

Faulty ignition coil with ignitor
Low compression
Engine and emission control system out of
order

Lead contamination of three way catalytic
converter

Faulty evaporative emission control system

Fuel pressure out of specification

Closed loop system (A / F feed back
compensation) fails
–Faulty TP sensor
–Poor performance of ECT sensor or MAP
sensor

Faulty injector

Faulty fuel injector resistor

Faulty ECM (PCM)
Others

Engine not at normal operating temperature

Clogged air cleaner

Vacuum leaks
Spark plugs in Section 6F
High-tension cords in Section 6F
Ignition coil assembly in Section
6F
Refer to “Low compression”
section
Check for absence of filler neck
restrictor
EVAP control system in Section
6E1
Diagnostic Flow Table B-3
TP sensor in Section 6E1
ECT sensor or MAP sensor in
Section 6E1
Diagnostic Flow Table B-1
Fuel injector resistor in Section 6E1
Excessive nitrogen
oxides (NOx)
emissionIgnition system out of order

Improper ignition timing
Engine and emission control system out of
order

Lead contamination of catalytic converter

Fuel pressure out of specification

Closed loop system (A / F feed back
compensation) fails
–Faulty TP sensor
–Poor performance of ECT sensor or MAP
sensor

Faulty injector

Faulty fuel injector resistor

Faulty ECM (PCM)
See section 6F1
Check for absence of filler neck
restrictor.
Diagnostic Flow Table B-3
TP sensor in Section 6E1
ECT sensor or MAP sensor in
Section 6E1
Diagnostic Flow Table B-1
Fuel injector resistor in Section 6E1

ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-69
Below
specified value DTC DETECTING CONDITION
POSSIBLE CAUSE

Engine under other than high revolution condition

Not on rough road

Engine speed changing rate

Manifold absolute
pressure changing rate

Throttle opening changing rate

Misfire rate per 200 or 1000 engine revolutions (how
much and how often crankshaft revolution speed
changes) is higher than specified value
Engine overheating

Vacuum leaks (air inhaling) from air intake system

Ignition system malfunction (spark plug(s), high-
tension cord(s), ignition coil assembly)

Fuel pressure out of specification

Fuel injector malfunction (clogged or leakage)

Engine compression out of specification

Valve lash (clearance) out of specification

Manifold absolute pressure sensor malfunction

Engine coolant temp. sensor malfunction

PCV valve malfunction

EVAP control system malfunction
DTC CONFIRMATION PROCEDURE
WARNING:

When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and be very careful during testing to avoid occurrence of an accident.

Road test should be carried out with 2 persons, a driver and a tester.
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON.
3) Check vehicle and environmental condition for:
–Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
–Ambient temp.: –10C, 14F or higher
–Intake air temp.: 70C, 158F or lower
–Engine coolant temp.: –10 – 11 0C, 14 – 230F
4) Start engine and keep it at idle for 2 min. or more.
5) Check DTC in “DTC” mode and pending DTC in “ON BOARD TEST” or “PENDING DTC” mode.
6) If DTC is not detected at idle, consult usual driving based on information obtained in “Customer complaint analy-
sis” and “Freeze frame data check”.

6-70 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
INSPECTION
STEPACTIONYESNO
1Was “ENGINE DIAG. FLOW TABLE” performed?Go to Step 2.Go to “ENGINE
DIAG. FLOW
TABLE“.
2Is there DTC other than Fuel system (DTC P0171 / P0172)
and misfire (DTC P0300-P0303)?Go to applicable
DTC Diag.
Flow Table.Go to Step 3.
3Check Ignition System.
1) Remove spark plugs and check them for;

Air gap: 1.0 – 1.1 mm (0.040 – 0.043 in.) See Fig. 1.

Carbon deposits

Insulator damage

Plug type
If abnormality is found, adjust, clean or replace.
2) Disconnect injector connector. See Fig. 2.
3) Connect spark plugs to high tension cords and then
ground spark plugs.
4) Crank engine and check that each spark plug sparks.
Are above check results satisfactory?Go to Step 4.Check ignition
system parts
(Refer to Section
6F).
4Check Fuel Pressure (Refer to Section 6E1 for details).
1) Release fuel pressure from fuel feed line.
2) Install fuel pressure gauge. See Fig. 3.
3) Check fuel pressure.
With fuel pump operating
and engine at stop : 160 – 210 kPa, 1.6 – 2.1 kg / cm
2,
22.7 – 29.9 psi.
At specified idle speed : 90 – 140 kPa, 0.9 – 1.4 kg / cm
2,
12.8 – 20.0 psi.
Is measured value as specified?
Go to Step 5.Go to Diag. Flow
Table B-3 fuel
pressure check.
5Check Fuel Injector and Circuit.
1) Turn ignition switch OFF and disconnect fuel injector
connector.
2) Check for proper connection to fuel injector at each terminal.
3) If OK, then check injector resistance. See Fig. 4.
Injector resistance: 0.5 – 1.5 Ω at 20C (68F).
4) Connect injector connector.
5) Check that fuel is injected out in conical shape from fuel
injector when running engine.
6) Check injector for fuel leakage after engine stop.
Fuel leakage: Less than 1 drop / min.
Is check result satisfactory?Go to Step 6.Check injector
circuit or replace
fuel injector.

6-1-20 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
ENGINE BASIC INSPECTION
This check is very important for troubleshooting when ECM (PCM) has detected no DTC and no abnormality has
been found in visual inspection.
Follow the flow table carefully.
STEP
ACTIONYESNO
1Was “ENGINE DIAG. FLOW TABLE” performed?Go to Step 2.Go to “ENGINE DIAG.
FLOW TABLE”.
2Check battery voltage.
Is it 11 V or more?Go to Step 3.Charge or replace
battery.
3Is engine cranked?Go to Step 4.Go to “DIAGNOSIS”
in Section 6G.
4Does engine start?Go to Step 5.Go to Step 7.
5Check idle speed as follows:
1) Warm up engine to normal operating temp.
2) Shift transmission to neutral position for M / T
(“P” position for A / T).
3) All of electrical loads are switched off.
4) Check engine idle speed with scan tool.
See Fig. 1.
Is it 700 – 800 r / min?Go to Step 6.“ENGINE DIAGNO-
SIS TABLE” in this
section.
6Check ignition timing as follows:
1) Using SUZUKI scan tool, select “MISC” mode on
SUZUKI scan tool and fix ignition timing to initial
one. See Fig. 2.
2) Remove air cleaner bolt and shift air cleaner
position to observe ignition timing.
3) Using timing light (1), check initial ignition timing.
See Fig. 3.
Is it 5 ± 3 BTDC at specified idle speed?“ENGINE DIAGNO-
SIS TABLE” in this
section.Check ignition control
related parts referring
to Section 6F1.
7Check fuel supply as follows:
1) Check to make sure that enough fuel is filled in fuel
tank.
2) Turn ON ignition switch for 2 seconds and then
OFF. See Fig. 4.
Is fuel return pressure (returning sounds) felt from fuel
feed hose (1) when ignition switch is turned ON?Go to Step 9.Go to Step 8.
8Check fuel pump for operating.
1) Was fuel pump operating sound heard from fuel
filler for about 2 seconds after ignition switch ON
and stop?Go to “DIAG. FLOW
TABLE B-3”.Go to “DIAG. FLOW
TABLE B-2”.
9Check ignition spark as follows:
1) Disconnect injector couplers.
2) Remove spark plugs and connect them to high
tension cords.
3) Ground spark plugs.
4) Crank engine and check if each spark plug sparks.
Is it in good condition?Go to Step 10.Go to “DIAGNOSIS”
in Section 6F1.
10Check fuel injector for operation as follows:
1) Install spark plugs and connect injector
connectors.
2) Using sound scope (1), check operating sound of
each injector (2) when cranking engine. See Fig. 5.
Was injector operating sound heard from all
injectors?“ENGINE DIAGNO-
SIS TABLE” in this
section.Go to “DIAG. FLOW
TABLE B-1”.

6-1-22 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
ENGINE DIAGNOSIS TABLE
Perform troubleshooting referring to following table when ECM (PCM) has detected no DTC and no abnormality
has been found in visual inspection and engine basic inspection previously.
Condition
Possible CauseReferring Item
Hard Starting
(Engine cranks OK)Ignition system out of order

Faulty spark plug

Leaky high-tension cord

Loose connection or disconnection of high-
tension cords or lead wires

Faulty ignition coil
Fuel system out of order

Dirty or clogged fuel hose or pipe

Malfunctioning fuel pump

Air inhaling from intake manifold gasket or
throttle body gasket
Engine and emission control system out of
order

Faulty idle air control system

Faulty ECT sensor or MAP sensor

Faulty ECM (PCM)
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
Others

Malfunctioning PCV valve
Spark plugs in Section 6F1
High-tension cords in Section 6F1
High-tension cords in Section 6F1
Ignition coil in Section 6F1
Diagnostic Flow Table B-3
Diagnostic Flow Table B-3
Diagnostic Flow Table B-4
ECT sensor or MAP sensor in
Section 6E2
Compression check in Section
6A1
Spark plugs in Section 6F1
Valves inspection in Section 6A1
Valves inspection in Section 6A1
Valve springs inspection in
Section 6A1
Cylinder head inspection in
Section 6A1
Cylinders, pistons and piston rings
inspection in Section 6A1
Cylinders, pistons and piston rings
inspection in Section 6A1
PCV system in Section 6E2

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-23
ConditionPossible Cause]Referring Item
Low oil pressure
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 partsEngine oil and oil filter change in
Section 0B
Oil pressure switch inspection in
Section 8
Oil pan and oil pump strainer
cleaning in Section 6A1
Oil pump in Section 6A1
Oil pump in Section 6A1
Engine noise
Note: Before
checking mechanical
noise, make sure
that:

Specified spark
plug in used.

Specified fuel is
used.Valve noise

Improper valve lash

Worn valve stem and guide

Weak or broken valve spring

Warped or bent valve
Piston, ring and cylinder noise

Worn piston, ring and cylinder bore
Connecting rod noise

Worn rod bearing

Worn crank pin

Loose connecting rod nuts

Low oil pressure
Crankshaft noise

Low oil pressure

Worn bearing

Worn crankshaft journal

Loose bearing cap bolts

Excessive crankshaft thrust play
Valve lash in Section 6A1
Valves inspection in Section 6A1
Valve springs inspection in
Section 6A1
Valves inspection in Section 6A1
Pistons and cylinders inspection
in Section 6A1
Crank pin and connecting rod
bearing inspection in Section 6A1
Crank pin and connecting rod
bearing inspection in Section 6A1
Connecting rod installation in
Section 6A1
Previously outlined
Previously outlined
Crankshaft and bearing
inspection in Section 6A1
Crankshaft and bearing
inspection in Section 6A1
Crankshaft inspection in
Section 6A1
Crankshaft thrust play inspection
in Section 6A1