2000 SUZUKI SWIFT SF310 Service Workshop Manual

1. ECM (PCM)
2. Ignition coil assembly
for No.1 and No.4 spark plugs
3. Ignition coil assembly
for No.2 and No.3 spark plugs4. CMP sensor
5. CKP sensor
6. MAP sensor
7. ECT sensor
8. IAT sensor9. TP sensor
10. VSS (A / T)
11. Transmission range switch (A / T)
12. High-tension cords
13. VSS (speedometer) (M / T)
14. Data link connector
6F1-2 IGNITION SYSTEM (SFI FOR G13)
GENERAL DESCRIPTION
The ignition system is an electronic (distributorless) ignition system. It consists of the parts as described below and
has an electronic ignition control system.

ECM (PCM)
It detects the engine and vehicle conditions through the signals from the sensors, determines the most suitable
ignition timing and time for electricity to flow to the primary coil and sends a signal to the ignitor (power unit) in
the ignition coil assembly.

Ignition coil assembly (including an ignitor)
The ignition coil assembly has a built-in ignitor which turns ON and OFF the current flow to the primary coil accord-
ing to the signal from ECM (PCM). When the current flow to the primary coil is turned OFF, a high voltage is in-
duced in the secondary coil.

High tension cords and spark plugs.

CMP sensor (Camshaft position sensor) and CKP sensor (Crankshaft position sensor)
Using signals from these sensors, ECM (PCM) identifies the specific cylinder whose piston is in the compression
stroke and detects the crank angle.

TP sensor, ECT sensor, MAP sensor and other sensors / switches
Refer to section 6E2 for details.
Although this ignition system does not have a distributor, it has two ignition coil assemblies (one is for No.1 and
No.4 spark plugs and the other is for No.2 and No.3 spark plugs). When an ignition signal is sent from ECM (PCM)
to the ignitor in the ignition coil assembly for No.1 and No.4 spark plugs, a high voltage is induced in the secondary
coil and that passes through the high-tension cords and causes No.1 and No.4 spark plugs to spark simultaneously.
Likewise, when an ignition signal is sent to the ignitor in the other ignition coil assembly, No.2 and No.3 spark plugs
spark simultaneously.
SYSTEM COMPONENTS

1. Ignition switch
2. Main relay
3. Ignition coil assembly
for No.1 and No.4
spark plugs
4. Ignition coil assembly
for No.2 and No.3
spark plugs5. CMP sensor
6. CKP sensor
7. No.1 spark plug
8. No.2 spark plug
9. No.3 spark plug
10. No.4 spark plug11. Sensed information

MAP sensor

ECT sensor

IAT sensor

TP sensor

VSS
Park / Neutral position signal
(A / T)

Electric load signal

Engine start signal
IGNITION SYSTEM (SFI FOR G13) 6F1-3
SYSTEM WIRING DIAGRAM
DIAGNOSIS
ConditionPossible CauseCorrection
Engine cranks, but will
not start or hard to
startNo spark

Blown fuse for ignition coil

Loose connection or disconnection of lead
wire or high-tension cord(s)

Faulty high-tension cord(s)

Faulty spark plug(s)

Faulty ignition coil

Faulty CKP sensor or crankshaft timing belt
pulley

Faulty ECM (PCM)
Replace.
Connect securely.
Replace.
Adjust, clean or replace.
Replace ignition coil assembly.
Clean, tighten or replace.
Replace.
Poor fuel economy or
engine performance
Incorrect ignition timing

Faulty spark plug(s) or high-tension cord(s)

Faulty ignition coil assembly

Faulty CKP sensor or crankshaft timing belt
pulley

Faulty ECM (PCM)Check related sensors and
crankshaft timing belt pulley.
Adjust, clean or replace.
Replace.
Clean, tighten or replace.
Replace.

6F1-4 IGNITION SYSTEM (SFI FOR G13)
IGNITION SYSTEM DIAGNOSTIC FLOW TABLE
STEPACTIONYESNO
1
Was “ENGINE DIAG. FLOW TABLE” performed?Go to Step 2.Go to “ENGINE DIAG.
FLOW TABLE” in
section 6.
2
Ignition Spark Test
1) Check all spark plugs for condition and type
referring to “Spark Plugs” section.
2) If OK, perform ignition spark test, referring to
“Ignition Spark Test” section.
Is spark emitted from all spark plugs?Go to Step 11.Go to Step 3.
3
Diagnostic Trouble Code (DTC) Check
Is DTC stored in ECM (PCM)?Go to applicable DTC
Diag. Flow Table in
section 6.Go to Step 4.
4
Electrical Connection Check
1) Check ignition coil assemblies and high-tension
cords for electrical connection.
Are they connected securely?Go to Step 5.Connect securely.
5
High-Tension Cords Check
1) Check high-tension cord for resistance referring
to “High-Tension Cords” section.
Is check result satisfactory?Go to Step 6.Replace high-tension
cord(s).
6
Ignition Coil Assembly Power Supply and Ground
Circuit Check
1) Check ignition coil assembly power supply and
ground circuits for open and short.
Are circuits in good condition?Go to Step 7.Repair or replace.
7
Ignition Coil Assembly Check
1) Check ignition coil for resistance referring to
“Ignition Coil Assembly” section.
Is check result satisfactory?Go to Step 8.Replace ignition coil
assembly.
8
Crankshaft Position (CKP) Sensor Check
1) Check crankshaft position sensor referring to
Step 3 and 4 of DTC P0335 Diag. Flow Table in
section 6.
Is check result satisfactory?Go to Step 9.Tighten CKP sensor
bolt, replace CKP
sensor or crankshaft
timing belt pulley.
9
Ignition Trigger Signal Circuit Check
1) Check ignition trigger signal wire for open, short
and poor connection.
Is circuit in good condition?Go to Step 10.Repair or replace.
10
A Known-good Ignition Coil Assembly Substitution
1) Substitute a known-good ignition coil assembly
and then repeat Step 2.
Is check result of Step 2 satisfactory?Go to Step 11.Substitute a known-
good ECM (PCM) and
then repeat Step 2.
11
Ignition Timing Check
1) Check initial ignition timing and ignition timing
advance referring to “Ignition Timing” section.
Is check result satisfactory?System is in good
condition.Check CKP sensor,
crankshaft timing belt
pulley (signal rotor)
and input signals
related to this system.

IGNITION SYSTEM (SFI FOR G13) 6F1-5
ON-VEHICLE SERVICE
IGNITION SPARK TEST
1) Disconnect all injector couplers (1) from injectors (2).
WARNING:
Without disconnection of injector couplers, combustible
gas may come out from spark plug holes during this test
and may get ignited in engine room.
2) Remove spark plug and check it for condition and type referring
to “Spark Plugs” in this section.
3) If OK, connect ignition coil coupler to ignition coil assembly and
connect spark plug to ignition coil assembly or high-tension
cord. Ground spark plug.
4) Crank engine and check if each spark plug sparks.
5) If no spark is emitted, inspect the related parts as described un-
der “Diagnosis” earlier in this section.
HIGH-TENSION CORDS
1) Disconnect high-tension cords (1) from ignition coil assemblies
(2) while gripping each cap.
2) Pull out high-tension cords from spark plugs while gripping each
cap.
CAUTION:
Pull out each connection by gripping cap portion so as
not to damage their inside wire (resistive conductor).
3) Measure resistance of high-tension cord (1) by using ohmmeter.
High-tension cord resistance: 4 – 10 kΩ/ m (1.2 – 3.0 kΩ/ ft)
4) If resistance exceeds specification, replace high-tension
cord(s).

“a”
6F1-6 IGNITION SYSTEM (SFI FOR G13)
5) Install high-tension cords (1) to spark plugs and ignition coil as-
semblies (2) while gripping each cap.
CAUTION:

Never attempt to use metal conductor high-tension
cords as replacing parts.

Insert each cap portion fully when installing high-ten-
sion cords.
SPARK PLUGS
1) Pull out high-tension cords by gripping their caps and then re-
move ignition coil assemblies referring to IGNITION COIL AS-
SEMBLY in this section.
2) Remove spark plugs.
3) Inspect them for:

Electrode wear

Carbon deposits

Insulator damage
4) If any abnormality is found, adjust air gap, clean with spark plug
cleaner or replace them with specified new plugs.
Spark plug air gap “a”: 1.0 – 1.1 mm ( 0.040 – 0.043 in.)
Spark plug type : NGK BKR6E-11
: DENSO K20PR-U11
5) Install spark plugs and torque them to specification.
Tightening Torque for spark plug
28 N.m (2.8 kg-m, 20.0 lb-ft)
6) Install ignition coil assemblies referring to IGNITION COIL AS-
SEMBLY in this section.
7) Install high-tension cords securely by gripping their caps.
IGNITION COIL ASSEMBLY
(INCLUDING IGNITOR)
Inspection
1) Disconnect negative cable at battery.
2) Disconnect ignition coil coupler.
3) Disconnect high-tension cord (3) from ignition coil assembly (2).
4) Remove ignition coil bolts (1) and then pull out ignition coil as-
sembly.

IGNITION SYSTEM (SFI FOR G13) 6F1-7
5) Measure secondary coil for resistance.
Secondary coil resistance : 7.6 – 10.2 kΩ at 20C, 68F
If resistance is out of specification, replace ignition coil assem-
bly.
6) Install ignition coil assembly.
7) Tighten ignition coil bolts, and then connect ignition coil coupler.
8) Install high-tension cord to ignition coil assembly while gripping
its cap.
CRANKSHAFT POSITION SENSOR
(CKP SENSOR)
Refer to section 6E2 for removal, inspection and installation.
IGNITION TIMING
NOTE:

Ignition timing is not adjustable. If ignition timing is out of
specification, check system related parts.

Before starting engine, place transmission gear shift lever in
“Neutral” (shift selector lever to “P” range for A / T model),
and set parking brake.
INSPECTION
1) Connect SUZUKI scan tool to DLC with ignition switch OFF.
Special Tool
(A): 09931-76011 (SUZUKI scan tool)
(B): Mass storage cartridge
(C): 09931-76030 (16 / 14 pin DLC cable)
2) Start engine and warm it up to normal operating temperature.
3) Make sure that all of electrical loads except ignition are switched
off.
4) Check to be sure that idle speed is within specification.
(Refer to SECTION 6E2)

6F1-8 IGNITION SYSTEM (SFI FOR G13)
5) Fix ignition timing to initial one as follow.
Select “MISC” mode on SUZUKI scan tool and fix ignition tim-
ing to initial one.
6) Detach air cleaner case and shift air cleaner case and hose
position to observe ignition timing.
7) Using timing light (1), check that ignition timing is within specifi-
cation.
Initial ignition timing (fixed with
SUZUKI scan tool) : 5
3 BTDC at idle speed
Ignition order : 1-3-4-2
8) If ignition timing is out of specification, check the followings:

CKP sensor

Crankshaft timing belt pulley (signal rotor)

TP sensor

VSS

Timing belt cover installation
9) After checking Initial Ignition Timing, release ignition timing
fixation by using SUZUKI scan tool.
10) With engine idling (throttle opening at closed position and ve-
hicle stopped), check that ignition timing is about 9–15
BTDC. (Constant variation within a few degrees from 9–15
indicates no abnormality but proves operation of electronic tim-
ing control system.) Also, check that increasing engine speed
advances ignition timing.
If above check results are not satisfactory, check CKP sensor
and ECM (PCM).
11) Install air cleaner case.

09931-76011
SUZUKI scan tool (Tech 1A) kit1. Storage case
2. Operator’s manual
3. Tech 1A
4. DLC cable (14 / 26 pin,
09931-76040)
5. Test lead / probe
6. Power source cable
7. DLC cable adaptor
8. Self-test adaptor
Mass storage cartridge09931-76030
16 / 14 pin DLC cable
IGNITION SYSTEM (SFI FOR G13) 6F1-9
SPECIAL TOOLS