Suzuki Grand Vitara 2011 Manual page 125

Condition
Poor gasoline mileage
Excessive engine oil
consumption – Oil
leakage
Engine General Information and Diagnosis: For Petrol Engine Model 1A-56
Possible cause
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)
Blown cylinder head gasket
Leaky camshaft oil seals
Correction / Reference Item
"High-Tension Cord Removal and Installation
(For M16 Engine): For Petrol Engine Model in
Section 1H"
"Spark Plug Inspection: For Petrol Engine
Model in Section 1H"
"EGR Valve Inspection: For Petrol Engine
Model in Section 1B"
Condition "Improper engine idling or engine
fails to idle"
"Engine Coolant Temperature (ECT) Sensor
Inspection: For Petrol Engine Model in Section
1C" or "Mass Air Flow (MAF) and Intake Air
Temperature (IAT) Sensor Inspection: For
Petrol Engine Model in Section 1C"
"Electric Throttle Body Assembly On-Vehicle
Inspection: For Petrol Engine Model in Section
1C"
"Accelerator Pedal Position (APP) Sensor
Assembly Inspection: For Petrol Engine Model
in Section 1C"
"Fuel Injector Circuit Check: For Petrol Engine
Model"
"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: For Petrol Engine
Model in Section 1F"
"Tires Description in Section 2D"
"Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D"
"Cylinder Head Inspection: For J20 Engine in
Section 1D" or "Cylinder Head Inspection: For
M16A Engine with VVT in Section 1D"
"Camshaft, Tappet and Shim Inspection: For
J20 Engine in Section 1D" or "Camshaft,
Tappet and Shim Inspection: For M16A Engine
with VVT in Section 1D"