Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES) 6-39
Overheating • Inoperative thermostat “Thermostat” in Section 6B.
• Poor water pump performance “Water Pump” in Section 6B.
• Clogged or leaky radiator “Radiator” in Section 6B.
• Improper engine oil grade “Engine Oil and oil Filter Change” in Section
0B.
• Clogged oil filter or oil strainer “Oil Pressure Check” in Section 6A1 or 6A4.
• Poor oil pump performance “Oil Pressure Check” in Section 6A1 or 6A4.
• Dragging brakes “Diagnosis Table” in Section 5.
• Slipping clutch “Diagnosis Table” in Section 7C.
• Blown cylinder head gasket “Valves and Cylinder Head” in Section 6A1
or 6A4.
• Faulty A/C condenser fan control
system
“Diag. Flow Table B-7” or “Diag. Flow Table
B-8” in this section.
Poor gasoline mile-
age Ignition system out of order.
• Faulty spark plug (improper gap,
heavy deposits, and burned elec-
trodes, etc.)
“Spark Plugs” in Section 6F1 or 6F2.
Engine and emission control system
out of order.
• Fuel pressure out of specification
“Diag. Flow Table B-3” in this section.
• Faulty TP sensor, ECT sensor or
MAF sensor
“TP sensor”, “ECT Sensor” or “MAF Sensor”
in Section 6E1.
• Faulty EGR system “DTC P0400 Diag. Flow Table” in this sec-
tion.
• Faulty injector “Fuel Injector” in Section 6E1.
• Faulty ECM (PCM) “Inspection of ECM (PCM) and Its Circuit” in
this section.
Low compression Previously outlined.
Others
• Poor valve seating
“Valves and Cylinder Head” in Section 6A1
or 6A4.
• Dragging brakes “Diagnosis Table” in Section 5.
• Slipping clutch “Diagnosis Table” in Section 7C.
• Thermostat out of order “Thermostat” in Section 6B.
• Improper tire pressure
• Faulty A/C condenser fan control
system
“Diag. Flow Table B-7” or “Diag. Flow Table
B-8” in this section.
Condition Possible Cause Correction