Diagnosis; Diagnostic Flow Table - Suzuki 2000 Grand Vitara SQ625 Service Manual

6F2-4 IGNITION SYSTEM (FOR J20 / H25 ENGINES)
Condition
Engine cranks, but will not
start or hard to start
Poor fuel economy or engine
performance

DIAGNOSTIC FLOW TABLE

STEP
1 Was "Engine Diagnostic Flow Table" in SECTION 6
or 6-1 performed?
2 Ignition Spark Test
1) Check all spark plug for condition and type, refer-
ring to "Spark Plug" in this section.
2) If OK, perform ignition spark test, referring to
"Ignition Spark Check" in this section.
Is spark emitted from all spark plugs?
3 Diagnostic Trouble Code (DTC) Check
1) Check DTC stored in ECM (or PCM), referring to
"Diagnostic Trouble Code (DTC) Check" in
SECTION 6E1 or 6E2.
Is DTC stored?
4 Electrical Connection Check
1) Check ignition coil assemblies for electrical con-
nection.
Are they connected securely?
5 Ignition Coil Assembly Power Supply, Ground and
Trigger Signal Circuits Check
1) Check these circuits for open and short.
Are circuits in good condition?

DIAGNOSIS

Possible Cause
No spark
_ Blown fuse for ignition coil assembly
_ Loose connection or disconnection of lead
wire
_ Faulty spark plug(s)
_ Faulty ignition coil assembly(s)
_ Faulty CMP sensor
_ Faulty ECM (or PCM)
_ Maladjusted ignition timing
_ Incorrect ignition timing
_ Faulty spark plug(s)
_ Faulty ignition coil assembly(s)
_ Faulty CMP sensor
_ Faulty ECM (or PCM)
ACTION
Replace
Connect securely
Adjust, clean or replace
Replace
Replace
Replace
Adjust
Adjust
Adjust, clean or replace
Replace
Replace
Replace
YES
Go to Step 2.
Go to Step 8 on the
next page.
Go to applicable flow
table corresponding
to that code No. in
SECTION 6E1 or
6E2.
Go to Step 5.
Go to Step 6 on the
next page.
Correction
NO
Go to "Engine Diag-
nostic Flow Table" in
SECTION 6 or 6-1.
Go to Step 3.
Go to Step 4.
Connect securely.
Repair or replace.