Suzuki Grand Vitara Service Manual page 58

1A-51 Engine General Information and Diagnosis:
Condition
Engine overheating
Poor gasoline mileage
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Possible cause
Inoperative thermostat
Poor water pump performance
Clogged or leaky radiator
Improper engine oil grade
Clogged oil filter or oil strainer
Poor oil pump performance
Faulty radiator cooling fan control
system
Dragging brakes
Slipping clutch (for M/T model)
Blown cylinder head gasket
Air mixed in cooling system
Leaks or loose connection of high-
tension cord (for M16 engine)
Faulty spark plug (improper gap, heavy
deposits and burned electrodes, etc.)
Malfunctioning EGR valve
High idle speed
Poor performance of ECT sensor or
MAF sensor
Faulty electric throttle body assembly
Faulty accelerator pedal position (APP)
sensor assembly
Faulty fuel injector(s)
Faulty ECM
Low compression
Poor valve seating
Dragging brakes
Slipping clutch (for M/T model)
Thermostat out of order
Improper tire pressure
Camshaft position control (VVT) system
out of order (for M16 engine)
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Correction / Reference Item
"Thermostat Inspection: in Section 1F"
"Water Pump Inspection: in Section 1F"
"Radiator On-Vehicle Inspection and Cleaning:
in Section 1F"
"Engine Oil and Filter Change: in Section 0B"
"Oil Pressure Check: For J20 Engine in
Section 1E" or "Oil Pressure Check: For M16A
Engine with VVT in Section 1E"
"Oil Pressure Check: For J20 Engine in
Section 1E" or "Oil Pressure Check: For M16A
Engine with VVT in Section 1E"
"Radiator Cooling Fan Low Speed Control
System Check: " or "Radiator Cooling Fan
High Speed Control System Check: "
Condition "Dragging brakes" in "Brakes
Symptom Diagnosis: in Section 4A"
Condition "Slipping clutch" in "Clutch
(Hydraulic Type) Symptom Diagnosis: in
Section 5C"
"Cylinder Head Inspection: For J20 Engine in
Section 1D" or "Cylinder Head Inspection: For
M16A Engine with VVT in Section 1D"
"High-Tension Cord Removal and Installation
(For M16 Engine): in Section 1H"
"Spark Plug Inspection: in Section 1H"
"EGR Valve Inspection: in Section 1B"
Condition "Improper engine idling or engine
fails to idle"
"Engine Coolant Temperature (ECT) Sensor
Inspection: in Section 1C" or "Mass Air Flow
(MAF) and Intake Air Temperature (IAT)
Sensor Inspection: in Section 1C"
"Electric Throttle Body Assembly On-Vehicle
Inspection: in Section 1C"
"Accelerator Pedal Position (APP) Sensor
Assembly Inspection: in Section 1C"
"Fuel Injector Circuit Check: "
"Compression Check: For J20 Engine in
Section 1D" or "Compression Check: For
M16A Engine with VVT in Section 1D"
"Valves and Valve Guides Inspection: For J20
Engine in Section 1D" or "Valves and Valve
Guides Inspection: For M16A Engine with VVT
in Section 1D"
Condition "Dragging brakes" in "Brakes
Symptom Diagnosis: in Section 4A"
Condition "Slipping clutch" in "Clutch
(Hydraulic Type) Symptom Diagnosis: in
Section 5C"
"Thermostat Inspection: in Section 1F"
"Tires Description: in Section 2D"
"Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D"