Suzuki GRAND VITARA XL-7 Owner's Manual page 242

TROUBLESHOOTING
Step
1 Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2 Ignition system inspection :
1) Check spark plug and ignition spark of cylin-
der where misfire occurs, referring to "IGNI-
TION SYSTEM" section.
Is it in good condition?
3 Fuel injector circuit inspection :
1) Using sound scope, check each injector
operating sound at engine cranking or
idling.
Do all injectors make operating sound?
4 Fuel pressure inspection :
1) Check fuel pressure referring to "TABLE B-
3" in this section.
Is check result satisfactory?
5 Fuel injector inspection :
1) Check fuel injector(s) referring to Section
6E2.
Is check result satisfactory?
6 Ignition timing inspection :
1) Check ignition timing referring to Section
6F2.
Is check result satisfactory?
7 EGR system inspection :
1) Check EGR system referring to Section
6E2.
Is check result satisfactory?
8 Fuel level sensor inspection :
1) Check fuel level sensor referring to Section
6E2.
Is check result satisfactory?
9 Check engine mechanical parts or system
which can cause engine rough idle or poor per-
formance.
• Engine compression (See Section 6A2).
• Valve lash or lash adjuster (See Section
6A2).
• Valve timing (Timing belt or chain installa-
tion. See Section 6A2).
Are they in good condition?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-81
Action Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
Go to Step 9.
Check wire harness and
connection of ECM (PCM)
ground, ignition system
and fuel injector for inter-
mittent open and short.
No
Go to "ENGINE DIAG.
FLOW TABLE" in this
section.
Faulty ignition coil, wire
harness, or other system
parts.
Check coupler connec-
tion and wire harness of
injector not making oper-
ating sound and injector
itself.
If OK, substitute a known-
good ECM (PCM) and
recheck.
Repair or replace.
Replace.
Adjust or check system
related parts.
Repair or replace.
Repair or replace.
Repair or replace.