2005 SUZUKI JIMNY spark plugs

Downloaded from www.Manualslib.com manuals search engine IGNITION SYSTEM (ELECTRONIC IGNITION SYSTEM 6F-3
SYSTEM WIRING DIAGRAM
Diagnosis
1. Ignition switch 7. No.1 spark plug
2. Main relay 8. No.2 spark plug
3. Ignition coil assembly for No.1 and No.4 spark plugs 9. No.3 spark plug
4. Ignition coil assembly for No.2 and No.3 spark plugs 10. No.4 spark plug
5. CMP sensor 11. Sensed information (MAP sensor, ECT sensor, IAT sensor, TP sensor, Knock sensor, VSS, Park/
Neutral position signal, Electric load signal, Engine start signal, Test switch terminal)
6. CKP sensor
Condition Possible Cause Correction
Engine cranks, but will
not start or hard to
start (No spark)Blown fuse for ignition coil Replace.
Loose connection or disconnection of lead wire
or high-tension cord(s)Connect securely.
Faulty high-tension cord(s) Replace.
Faulty spark plug(s) Adjust, clean or replace.
Faulty ignition coil Replace ignition coil assembly.
Faulty CKP sensor or CKP sensor plate Clean, tighten or replace.
Faulty ECM Replace.
Poor fuel economy or
engine performanceIncorrect ignition timing Check related sensors and CKP
sensor plate.
Faulty spark plug(s) or high-tension cord(s) Adjust, clean or replace.
Faulty ignition coil assembly Replace.
Faulty CKP sensor or CKP sensor plate Clean, tighten or replace.
Faulty ECM Replace.

Downloaded from www.Manualslib.com manuals search engine 6F-4 IGNITION SYSTEM (ELECTRONIC IGNITION SYSTEM)
IGNITION SYSTEM DIAGNOSTIC FLOW TABLE
Step Action Yes No
1Was “Engine Diagnostic Flow Table” in Section 6 per-
formed?Go to Step 2. Go to “Engine Diag.
Flow Table” in Section
6.
2Ignition Spark Test
1) Check all spark plugs for condition and type refer-
ring to “Spark Plugs” section.
2) If OK, perform ignition spark test, referring to “Igni-
tion Spark Test” section.
Is spark emitted from all spark plugs?Go to Step 11. Go to Step 3.
3Diagnostic Trouble Code (DTC) Check
Is DTC stored in ECM?Go to applicable DTC
Diag. Flow Table in
Section 6.Go to Step 4.
4Electrical Connection Check
1) Check ignition coil assemblies and high-tension
cords for electrical connection.
Are they connected securely?Go to Step 5. Connect securely.
5High-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).
6Ignition Coil Assembly Power Supply and Ground Cir-
cuit 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.
7Ignition Coil Assembly Check
1) Check ignition coil for resistance referring to “Igni-
tion Coil Assembly” section.
Is check result satisfactory?Go to Step 8. Replace ignition coil
assembly.
8Crankshaft Position (CKP) Sensor Check
1) Check crankshaft position sensor referring to Step
2 and 6 of “DTC P0335 (No.23) CKP Sensor Cir-
cuit Malfunction” in Section 6.
Is check result satisfactory?Go to Step 9. Tighten CKP sensor
bolt, replace CKP sen-
sor or CKP sensor
plate.
9Ignition 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.
10A 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 and then
repeat Step 2.
11Ignition Timing Check
1) Check initial ignition timing and ignition timing
advance referring to “Ignition Timing” section.
Is check result satisfactory?System is in good con-
dition.Check CKP sensor,
CKP sensor plate and
input signals related to
this system.

Downloaded from www.Manualslib.com manuals search engine IGNITION SYSTEM (ELECTRONIC IGNITION SYSTEM 6F-5
On-Vehicle Service
Ignition Spark Test
1) Disconnect all injector connectors (1) from injectors.
2) Remove cylinder head upper cover.
3) Remove spark plug and check it for condition and type refer-
ring to “Spark Plugs” in this section.
4) If OK, connect ignition coil connector to ignition coil assem-
bly and connect spark plug to ignition coil assembly or high-
tension cord. Ground spark plug.
5) Crank engine and check if each spark plug sparks.
6) If no spark is emitted, inspect the related parts as described
under “Diagnosis” earlier in this section.
High-tension Cords
1) Remove cylinder head upper cover and disconnect high-ten-
sion cords (2) from ignition coil assemblies (1) while gripping
each cap.
2) Pull out high-tension cords from spark plugs while gripping
each cap.
3) Measure resistance of high-tension cord (1) by using ohm-
meter.
High-tension cord resistance
4 – 10 k
Ω/m (1.2 – 3.0 kΩ/ft)
4) If resistance exceeds specification, replace high-tension
cord(s). 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.
CAUTION:
Removal of high-tension cords together with clamps
will be recommended so as not to damage their inside
wire (resistive conductor).
For the same reason, pull out each connection by grip-
ping cap portion.

Downloaded from www.Manualslib.com manuals search engine 6F-6 IGNITION SYSTEM (ELECTRONIC IGNITION SYSTEM)
5) Install high-tension cords (2) to spark plugs and ignition coil
assemblies (1) while gripping each cap.
Spark Plugs
1) Pull out high-tension cords by gripping their caps and then
remove ignition coil assemblies referring to “Ignition Coil
Assembly” in this section.
2) Remove spark plugs.
3) Inspect them for:
Electrode wear
Carbon deposits
Insulator damage CAUTION:
Never attempt to use metal conductor high-tension
cords as replacing parts.
Insert each cap portion fully when installing high-ten-
sion cords.

Downloaded from www.Manualslib.com manuals search engine IGNITION SYSTEM (ELECTRONIC IGNITION SYSTEM 6F-7
4) If any abnormality is found, adjust air gap, clean with spark
plug cleaner or replace them with specified new plugs.
For iridium/platinum spark plugs, replace them with new
plugs.
Spark plug air gap “a”
1.0 – 1.1 mm (0.040 – 0.043 in.)
Spark plug type
NGK : BKR6E-11, IFR5E11
DENSO : K20PR-U11, SK16PR-A11
5) Install spark plugs and torque them to specification.
Tightening torque
Spark plug : 25 N·m (2.5 kg-m, 18.0 lb-ft)
6) Install ignition coil assemblies referring to “Ignition Coil
Assembly” in this section.
7) Install high-tension cords securely by gripping their caps.
Ignition Coil Assembly (Including Ignitor)
1) Disconnect negative cable at battery.
2) Remove cylinder head upper cover.
3) Disconnect ignition coil connector.
4) Disconnect high-tension cord (3) from ignition coil assembly
(2).
5) Remove ignition coil bolts (1) and then pull out ignition coil
assembly. NOTE:
NGK IFR5E11 or DENSO SK16PR-A11 is highly recom-
mended for better engine starting performance under –
25°C (– 13°F).
CAUTION:
When servicing the iridium/platinum spark plugs (slender
center electrode type plugs), do not touch the center
electrode to avoid damage to it. The electrode is not
strong enough against mechanical force as it is slender
and its material is not mechanically tough.