Diagnosis; Diagnostic Flow Table - Suzuki GRAND VITARA XL-7 Owner's Manual

6F2-4 IGNITION SYSTEM (FOR H27 ENGINE)
Condition
Engine cranks, but will
not start or hard to
start (No spark)
Poor fuel economy or
engine performance

Diagnostic Flow Table

Step
1 Was "ENGINE DIAGNOSTIC FLOW TABLE" in
Section 6-1 performed?
2 Ignition Spark Test
1) Check all spark plug for condition and type,
referring to "SPARK PLUG" in this section.
2) If OK, perform ignition spark test, referring
to "IGNITION SPARK CHECK" in this sec-
tion.
Is spark emitted from all spark plugs?
3 Diagnostic Trouble Code (DTC) Check
1) Check DTC stored in ECM (or PCM), refer-
ring to "DIAGNOSTIC TROUBLE CODE
(DTC) CHECK" in Section 6E2.
Is DTC stored?
4 Electrical Connection Check
1) Check ignition coil assemblies for electrical
connection.
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?
6 Ignition Coil Assembly Check
1) Substitute a known-good ignition coil
assembly and then repeat Step 2.
Is check result of Step 2 satisfactory?

Diagnosis

Possible Cause
Blown fuse for ignition coil assembly
Loose connection or disconnection of lead wire Connect securely.
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)
Faulty knock sensor
Action
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Yes
Go to Step 2.
Go to Step 8.
Go to applicable flow table
corresponding to that
code No. in Section 6E2.
Go to Step 5.
Go to Step 6.
Malfunction of ignition coil
assembly.
Correction
No
Go to "ENGINE DIAG-
NOSTIC FLOW TABLE" in
Section 6-1.
Go to Step 3.
Go to Step 4.
Connect securely.
Repair or replace.
Go to Step 7.