2000 SUZUKI SWIFT Ignition coil

6-26 ENGINE GENERAL INFORMATION AND DIAGNOSIS
ENGINE DIAGNOSIS TABLE
Perform troubleshooting referring to following table when ECM has detected no DTC and no abnormality has
been found in visual inspection and engine basic inspection previously.
Condition Possible Cause Correction
Hard Starting
(Engine cranks OK) Faulty spark plug Spark plugs in Section 6F1.
Leaky high-tension cord High-tension cords in Section 6F1.
Loose connection or disconnection of high-
tension cords or lead wiresHigh-tension cords in Section 6F1.
Faulty ignition coil Ignition coil in Section 6F1.
Dirty or clogged fuel hose or pipe Diagnostic Flow Table B-3.
Malfunctioning fuel pump Diagnostic Flow Table B-3.
Air inhaling from intake manifold gasket or
throttle body gasket
Faulty idle air control system Diagnostic Flow Table B-4.
Faulty ECT sensor or MAP sensor ECT sensor or MAP sensor in Section
6E1.
Faulty ECM
Hard Starting
(Engine cranks OK) Poor spark plug tightening or faulty gasket Spark plugs in Section 6F1.
Compression leak from valve seat Valves inspection in Section 6A1.
Sticky valve stem Valves inspection in Section 6A1.
Weak or damaged valve springs Valve springs inspection in Section
6A1.
Compression leak at cylinder head gasket Cylinder head inspection in Section
6A1.
Sticking or damaged piston ring Cylinders, pistons and piston rings
inspection in Section 6A1.
Worn piston, ring or cylinder Cylinders, pistons and piston rings
inspection in Section 6A1.
Malfunctioning PCV valve PCV system in Section 6E1.
Low compression Compression check in Section 6A1.
Low oil pressure
Improper oil viscosity Engine oil and oil filter change in Sec-
tion 0B.
Malfunctioning oil pressure switch Oil pressure switch inspection in Sec-
tion 8.
Clogged oil strainer Oil pan and oil pump strainer cleaning
in Section 6A1.
Functional deterioration of oil pump Oil pump in Section 6A1.
Worn oil pump relief valve Oil pump in Section 6A1.
Excessive clearance in various sliding parts

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-29
Excessive detona-
tion
(Engine makes con-
tinuously sharp
metallic knocks that
change with throttle
opening. Sounds
like pop corn pop-
ping.)Faulty spark plug Spark plugs in Section 6F1.
Loose connection of high-tension cord High-tension cords in Section 6F1.
Engine overheating Refer to “Overheating” section.
Clogged fuel filter (faulty fuel pump) or fuel
linesDiagnostic Flow Table B-1 or B-2.
Air inhaling from intake manifold or throttle
body gasket
Malfunctioning EGR valve (if equipped) EGR system in Section 6E1.
Poor performance of knock sensor, ECT sen-
sor or MAP sensorKnock sensor in Section 6, ECT sensor
or MAP sensor in Section 6E1.
Faulty fuel injector(s) Diagnostic Flow Table B-1.
Faulty ECM
Excessive combustion chamber deposits Piston and cylinder head cleaning in
Section 6A1.
Engine has no
powerFaulty spark plug Spark plugs in Section 6F1.
Faulty ignition coil with ignitor Ignition coil in Section 6F1.
Leaks, loose connection or disconnection of
high-tension cordHigh-tension cords in Section 6F1.
Faulty knock sensor Knock sensor malfunction in this sec-
tion.
Clogged fuel hose or pipe Diagnostic Flow Table B-3.
Malfunctioning fuel pump Diagnostic Flow Table B-2.
Air inhaling from intake manifold gasket or
throttle body gasket
Engine overheating Refer to “Overheating” section.
Engine has no
powerMalfunctioning EGR valve (if equipped) EGR system inspection in Section 6E1.
Maladjusted accelerator cable play Accelerator cable play in Section 6E1.
Poor performance of TP sensor, ECT sensor
or MAP sensorTP sensor, ECT sensor or MAP sensor
in Section 6E1.
Faulty fuel injector(s) Diagnostic Flow Table B-1.
Faulty ECM
Dragging brakes Trouble diagnosis in Section 5.
Slipping clutch Trouble diagnosis in Section 7C.
Low compression Previously outlined. Condition Possible Cause Correction

6-30 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Improper engine
idling or engine fails
to idleFaulty spark plug Spark plugs in Section 6F1.
Leaky or disconnected high-tension cord High-tension cords in Section 6F1.
Faulty ignition coil with ignitor Ignition coil in Section 6F1.
Fuel pressure out of specification Diagnostic Flow Table B-3.
Leaky manifold, throttle body, or cylinder
head gasket
Malfunctioning EGR valve (if equipped) EGR system in Section 6E1.
Faulty idle air control system Diagnostic Flow Table B-4.
Faulty evaporative emission control system EVAP control system in Section 6E1.
Faulty EGR system (if equipped) EGR system in Section 6E1.
Faulty fuel injector(s) Diagnostic Flow Table B-1.
Poor performance of ECT sensor, TP sensor
or MAP sensorECT sensor, TP sensor or MAP sensor
in Section 6E1.
Faulty ECM
Loose connection or disconnection of vacuum
hoses
Malfunctioning PCV valve PCV system in Section 6E1.
Engine overheating Refer to “Overheating” section.
Low compression Previously outlined.
Excessive hydrocar-
bon (HC) emission
or carbon monox-
ide (CO)Faulty spark plug Spark plugs in Section 6F1.
Leaky or disconnected high-tension cord High-tension cords in Section 6F1.
Faulty ignition coil with ignitor Ignition coil assembly in Section 6F1.
Low compression Refer to “Low compression” section.
Lead contamination of three way catalytic
converterCheck for absence of filler neck restric-
tor.
Faulty evaporative emission control system EVAP control system in Section 6E1.
Fuel pressure out of specification Diagnostic Flow Table B-3.
Closed loop system (A/F feed back compen-
sation) fails
Faulty TP sensor
Poor performance of ECT sensor or MAP
sensorTP sensor in Section 6E1.
ECT sensor or MAP sensor in Section
6E1.
Faulty injector(s) Diagnostic Flow Table B-1
Faulty ECM
Engine not at normal operating temperature
Clogged air cleaner
Vacuum leaks
Excessive nitrogen
oxides (NOx) emis-
sionImproper ignition timing See section 6F1.
Lead contamination of catalytic converter Check for absence of filler neck restric-
tor.
Faulty EGR system (if equipped) EGR system in Section 6E1.
Fuel pressure out of specification Diagnostic Flow Table B-3.
Closed loop system (A/F feed back compen-
sation) fails
Faulty TP sensor
Poor performance of ECT sensor or MAP
sensorTP sensor in Section 6E1.
ECT sensor or MAP sensor in Section
6E1.
Faulty injector(s) Diagnostic Flow Table B-1
Faulty ECM Condition Possible Cause Correction

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-37
ECM VOLTAGE VALUES TABLE
For TYPE A (See NOTE)
NOTE:
Type A is other than follows.
Type B is right hand steering vehicle equipped with fasten seat belt light and immobilizer control sys-
tem.
TERMINAL NO. CIRCUIT NORMAL VOLT-
AGECONDITION
C421 Ground––
2 Ground––
3 Ground––
4 EVAP canister purge valve 10 – 14 V Ignition switch ON
5 Engine coolant temp. and barometric
pressure signal for TCM (A/T)Indication
deflection
repeated 0 V
and 10 – 14 VIgnition switch ON
6 Idle air control valve 0 – 13 V At specified idle speed after engine warmed up
7 Heater of HO2S-1 (if equipped) 10 – 14 V Ignition switch ON
8 Fuel injector NO.4 10 – 14 V Ignition switch ON
9 Fuel injector NO.1 10 – 14 V Ignition switch ON
10 Sensor ground––
11 Camshaft position sensor 0 – 0.8 V and
4 – 6 VIgnition switch ON
12 Knock sensor (if equipped) 2.1 - 2.9 V Ignition switch ON
13 Heated oxygen sensor-1 (if equipped) Refer to DTC P0130 diag. flow table
CO adjusting resistor (if equipped)––
14 Engine coolant temp. sensor 0.55 - 0.95 V Ignition switch ON
Engine coolant temp. : 80°C (176°F)
15 Intake air temp. sensor 2.0 – 2.7 V Ignition switch ON
Intake air temp. : 20°C (68°F)
16 Test switch terminal (Vehicle without
immobilizer indicator lamp)4 – 6 V Ignition switch ON
17 Electric load signal (+) 0V Ignition switch ON
Small light and rear defogger OFF
10 – 14 V Ignition switch ON
Small light and rear defogger ON
18 A/C triple pressure switch 10 – 14 V A/C not operated
19 Ignition coil #2––
20 Ignition coil #1––
21 Fuel injector NO.2 10 – 14 V Ignition switch ON
22 Power source for sensor 4.75 – 5.25 V Ignition switch ON
23 Crankshaft position sensor––
24–– –
25 Shield ground––
26 Manifold absolute pressure sensor 3.3 – 4.0 V Ignition switch ON
Barometric pressure : 100 kPa (760 mmHg)
27 Diag. Switch terminal (Vehicle without
immobilizer indicator lamp)4 – 6 V Ignition switch ON
28 Monitor output (Vehicle without immo-
bilizer indicator lamp)––
29 Blank––
30 Blank––
31 Fuel injector NO.3 10 – 14 V Ignition switch ON

6-38 ENGINE GENERAL INFORMATION AND DIAGNOSIS
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
C411 A/C compressor clutch 0 V Ignition switch ON
2 EGR valve (stepper motor coil 1)
(if equipped)10 – 14 V Ignition switch ON
3 Throttle position sensor 0.2 – 1.0 V Ignition switch ON
Throttle valve at idle position
2.8 – 4.8 V Ignition switch ON
Throttle valve at full open position
4 Heater of HO2S-2
(Vehicle with immobilizer indicator lamp)10 – 14 V Ignition switch ON
5 Power source 10 – 14 V Ignition switch ON
6 Power source 10 – 14 V Ignition switch ON
7 Engine start switch
(Engine start signal)6 – 12 V While engine cranking
0 V Other than above
8 EGR valve (stepper motor coil 3)
(if equipped)10 – 14 V Ignition switch ON
9 EGR valve (stepper motor coil 2)
(if equipped)10 – 14 V Ignition switch ON
10 Main relay 10 – 14 V Ignition switch OFF
0.4 – 1.5 V Ignition switch ON
11 Blank––
12 Blank––
13 Heated oxygen sensor-2
(Vehicle with immobilizer indicator lamp)Refer to DTC P0130 diag. flow table
14 D-range ID-up signal (A/T) 10 – 14 V Ignition switch ON
15 R-range signal (A/T) 0 V Ignition switch ON
16 A/C (input) signal 10 – 14 V Ignition switch ON
A/C switch OFF
0 – 2 V Ignition switch ON
A/C switch ON
17 EGR valve (stepper motor coil 4)
(if equipped)10 – 14 V Ignition switch ON
18 Radiator fan control relay 10 – 14 V Ignition switch ON
Engine coolant temp. : 9.5°C or
lower (203°F)
0 – 1 V Ignition switch ON
Engine coolant temp. : 97.5°C
(208°F) or higher
19 Fuel pump relay 0 – 1 V For 2 seconds after ignition switch
ON
10 – 14 V After the above time
20–––

6-40 ENGINE GENERAL INFORMATION AND DIAGNOSIS
For TYPE B (For applicable mode, refer to NOTE in “ECM VOLTAGE VALUES TABLE”) G02 17 Power source for back-up 10 – 14 V Anytime
TERMINAL NO. CIRCUIT NORMAL VOLT-
AGECONDITION
C421Ground––
2Ground––
3Ground––
4 EVAP canister purge valve 10 – 14 V Ignition switch ON
5–– –
6 Idle air control valve 0 – 13 V At specified idle speed after engine warmed up
7 Heater of HO2S-1 (if equipped) 10 – 14 V Ignition switch ON
8 Fuel injector NO.4 10 – 14 V Ignition switch ON
9 Fuel injector NO.1 10 – 14 V Ignition switch ON
10 Sensor ground––
11 Camshaft position sensor 0 – 0.8 V and
4 – 6 VIgnition switch ON
12 Shield ground––
13 Heated oxygen sensor-1 (if equipped) Refer to DTC P0130 diag. flow table
CO adjusting resistor (if equipped)––
14 Engine coolant temp. sensor 0.55 - 0.95 V Ignition switch ON
Engine coolant temp. : 80°C (176°F)
15 Intake air temp. sensor 2.0 – 2.7 V Ignition switch ON
Intake air temp. : 20°C (68°F)
16 Throttle position sensor 0.2 – 1.0 V Ignition switch ON
Throttle valve at idle position
2.8 – 4.8 V Ignition switch ON
Throttle valve at full open position
17 EGR valve (stepper motor coil 3)
(if equipped)10 – 14 V Ignition switch ON
18 EGR valve (stepper motor coil 1)
(if equipped)10 – 14 V Ignition switch ON
19 Ignition coil #2––
20 Ignition coil #1––
21 Fuel injector NO.2 10 – 14 V Ignition switch ON
22 Power source for sensor 4.75 – 5.25 V Ignition switch ON
23 Crankshaft position sensor––
24–– –
25 knock sensor (if equipped) 2.1 – 2.9 V Ignition switch ON
26 Manifold absolute pressure sensor 3.3 – 4.0 V Ignition switch ON
Barometric pressure : 100 kPa (760 mmHg)
27–– –
28 EGR valve (stepper motor coil 4)
(if equipped)10 – 14 V Ignition switch ON
29 EGR valve (stepper motor coil 2)
(if equipped)10 – 14 V Ignition switch ON
30 A/C triple pressure switch 10 – 14 V A/C not operated
31 Fuel injector NO.3 10 – 14 V Ignition switch ON
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-43
Resistance Check
1) Disconnect ECM couplers from ECM with ignition switch
OFF.
2) Check resistance between each terminal of connectors dis-
connected.
TERMINAL RESISTANCE TABLE
For TYPE A (Refer to NOTE in “ECM VOLTAGE VALUES TABLE” for applicable model) CAUTION:
Never touch terminals of ECM itself or connect voltmeter
or ohmmeter.
CAUTION:
Be sure to connect ohmmeter probe from wire harness
side of coupler.
Be sure to turn OFF ignition switch for this check.
Resistance in table below represents that when parts
temperature is 20°C (68°F).
1. ECM coupler disconnected
2. Ohmmeter
TERMINALS CIRCUIT STANDARD
RESISTANCE
C42-7 to G02-6 HO2S-1 heater (if equipped) 5.0 – 6.4 Ω
C41-4 to G02-6 HO2S-2 heater (if equipped) 12.0 – 14.3 Ω
C42-9 to C41-5/6 No.1 injector 11.3 – 13.8 Ω
C42-21 to C41-5/6 No.2 injector 11.3 – 13.8 Ω
C42-31 to C41-5/6 No.3 injector 11.3 – 13.8 Ω
C42-8 to C41-5/6 No.4 injector 11.3 – 13.8 Ω
C41-2 to C41-5/6 EGR valve (stepper motor coil 1) (if equipped) 20 – 24 Ω
C41-9 to C41-5/6 EGR valve (stepper motor coil 2) (if equipped) 20 – 24 Ω
C41-8 to C41-5/6 EGR valve (stepper motor coil 3) (if equipped) 20 – 24 Ω
C41-17 to C41-5/6 EGR valve (stepper motor coil 4) (if equipped) 20 – 24 Ω
C42-4 to C41-5/6 EVAP canister purge valve 30 – 34 Ω
C41-19 to G02-6 Fuel pump relay 56 – 146 Ω
C41-1 to Body ground A/C compressor clutch 3 – 5.5 Ω
C41-18 to C41-5/6 Radiator fan control relay No.1 56 – 146 Ω
C41-10 to G02-17 Main relay 56 – 146 Ω
C42-1 to Body ground Ground Continuity
C42-2 to Body ground Ground Continuity
C42-3 to Body ground Ground Continuity

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-45
COMPONENT LOCATION
1. TP sensor 9. Radiator fan control relay No.3 17. ECM
2. MAP sensor 10. EVAP canister purge valve 18. Monitor connector
3. IAC valve 11. ECT sensor 19. VSS
4. IAT sensor 12. Ignition coil with igniter 20. Knock sensor (if equipped)
5. Radiator fan control relay No.1 13. HO2S-1 (if equipped) 21. CMP sensor
6. Main relay 14. HO2S-2 (if equipped) 22. EGR valve (if equipped)
7. Fuel pump relay 15. CKP sensor✱ : This figure shows left-hand steering vehicle, these parts are
installed at the other side for right-hand steering vehicle.
8. Radiator fan control relay No.2 16. TCM
1
3
24
518
6 7
20
19
8
9 1617
21
15
131214
10
22
11