Suzuki Engine 2002 GRAND VITARA SQ625, Руководство по обслуживанию

Страница: 43 / 834

6-38 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)
Surges
(Engine power varia-
tion under steady
throttle or cruise.
Feels like the vehicle
speeds up and down
with no change in the
accelerator pedal.) Ignition system out of order.
• Defective spark plug (excess carbon
deposits, improper gap, and burned
electrodes, etc.)
“Spark Plugs” in Section 6F1 or 6F2.
Fuel system out of order.
• Variable fuel pressure
– Clogged fuel filter
– Kinky or damaged fuel hose and
line
– Faulty fuel pressure regulator
“Diag. Flow Table B-3” in this section.
Engine and emission control system
out of order.
• Faulty EGR system
“DTC P0400 Diag. Flow Table” in this sec-
tion.
• Faulty MAF sensor “MAF Sensor” in Section 6E1.
• Faulty injector “Fuel Injector” in Section 6E1.
• Faulty ECM (PCM) “Inspection of ECM (PCM) and Its Circuit” in
this section.
Excessive detonation
(The engine makes
sharp metallic
knocks that change
with throttle opening.
Sounds like pop corn
popping.) Engine overheating Refer to “Overheating” in this table.
Ignition system out of order.
• Faulty spark plug
“Spark Plugs” in Section 6F1 or 6F2.
• Improper ignition timing “Ignition Timing Check and Adjustment” in
Section 6F1 or 6F2.
Fuel system out of order.
• Clogged fuel filter and fuel lines
“Fuel Pressure Check” in Section 6E1.
Engine and emission control system
out of order.
• Faulty EGR system
“DTC P0400 Diag. Flow Table” in this sec-
tion.
• Faulty ECT sensor or MAF sensor “ECT Sensor” or “MAF Sensor” in Section
6E1.
• Faulty injector “Fuel Injector” in Section 6E1.
• Faulty ECM (PCM) “Inspection of ECM (PCM) and Its Circuit” in
this section.
Others
• Excessive combustion chamber
deposits
“Valves and Cylinder Head” and “Pistons,
Piston Rings, Connecting Rods and Cylin-
ders” in Section 6A1 or 6A4.
Condition Possible Cause Correction