Suzuki GA413, Service Manual

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6F-4 IGNITION SYSTEM
DIAGNOSIS
Condition Possible Cause Correction
Engine cranks, but will
not start or hard to start
No spark or abnormal 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/ignitor
Faulty CKP sensor or crankshaft timing belt
pulley
Faulty ECM
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
Faulty CKP sensor or crankshaft timing belt
pulley
Faulty ECM
Check related sensors and
crankshaft timing belt pulley.
Adjust, clean or replace.
Replace.
Clean, tighten or replace.
Replace.
DIAGNOSTIC FLOW TABLE
STEP ACTION YES NO
1 Was ENGINE DIAG. FLOW CHART performed? Go to Step 2. Go to ENGINE DIAG.
FLOW CHART in
SECTION 6.
2 Ignition Spark Test
1) Check all spark plugs for condition and type,
referring to SPARK PLUGS.
2) If OK, perform ignition spark test, referring to
IGNITION SPARK TEST.
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 referring to DTC CHECK in
SECTION 6E?
Go to applicable flow
Chart corresponding to
that code No. in
SECTION 6E.
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 Cord Check
1) Check high-tension cord for resistance referring
to HIGH-TENSION CORD.
Is check result satisfactory?
Go to Step 6. Replace high-tension
cord(s).