Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 27
1A-55 Engine General Information and Diagnosis: For Petrol Engine Model
Engine overheating
Inoperative thermostat
“Thermostat Inspection: For Petrol Engine
Model in Section 1F”
Poor water pump performance
“Water Pump Inspection: For Petrol Engine
Model in Section 1F”
Clogged or leaky radiator
“Radiator On-Vehicle Inspection and Cleaning:
For Petrol Engine Model in Section 1F”
Improper engine oil grade
“Engine Oil and Filter Change (Petrol Engine
Model) in Section 0B”
Clogged oil filter or oil strainer
“Oil Pressure Check: For J20 Engine in
Section 1E” or “Oil Pressure Check: For M16A
Engine with VVT in Section 1E”
Poor oil pump performance
“Oil Pressure Check: For J20 Engine in
Section 1E” or “Oil Pressure Check: For M16A
Engine with VVT in Section 1E”
Faulty radiator cooling fan control
system
“Radiator Cooling Fan Low Speed Control
System Check: For Petrol Engine Model” or
“Radiator Cooling Fan High Speed Control
System Check: For Petrol Engine Model”
Dragging brakes
Condition “Dragging brakes” in “Brakes
Symptom Diagnosis in Section 4A”
Slipping clutch (for M/T model)
Condition “Slipping clutch” in “Clutch
(Hydraulic Type) Symptom Diagnosis in
Section 5C”
Blown cylinder head gasket
“Cylinder Head Inspection: For J20 Engine in
Section 1D” or “Cylinder Head Inspection: For
M16A Engine with VVT in Section 1D”
Air mixed in cooling system
Condition
Possible cause
Correction / Reference Item
Engine General Information and Diagnosis: For Petrol Engine Model 1A-56
Poor gasoline mileage
Leaks or loose connection of high-
tension cord (for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine): For Petrol Engine Model in
Section 1H”
Faulty spark plug (improper gap, heavy
deposits and burned electrodes, etc.)
“Spark Plug Inspection: For Petrol Engine
Model in Section 1H”
Malfunctioning EGR valve
“EGR Valve Inspection: For Petrol Engine
Model in Section 1B”
High idle speed
Condition “Improper engine idling or engine
fails to idle”
Poor performance of ECT sensor or
MAF sensor
“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”
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection: For Petrol Engine Model in Section
1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection: For Petrol Engine Model
in Section 1C”
Faulty fuel injector(s)
“Fuel Injector Circuit Check: For Petrol Engine
Model”
Faulty ECM
Low compression
“Compression Check: For J20 Engine in
Section 1D” or “Compression Check: For
M16A Engine with VVT in Section 1D”
Poor valve seating
“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”
Dragging brakes
Condition “Dragging brakes” in “Brakes
Symptom Diagnosis in Section 4A”
Slipping clutch (for M/T model)
Condition “Slipping clutch” in “Clutch
(Hydraulic Type) Symptom Diagnosis in
Section 5C”
Thermostat out of order
“Thermostat Inspection: For Petrol Engine
Model in Section 1F”
Improper tire pressure
“Tires Description in Section 2D”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Excessive engine oil
consumption – Oil
leakage
Blown cylinder head gasket
“Cylinder Head Inspection: For J20 Engine in
Section 1D” or “Cylinder Head Inspection: For
M16A Engine with VVT in Section 1D”
Leaky camshaft oil seals
“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”
Condition
Possible cause
Correction / Reference Item
1A-57 Engine General Information and Diagnosis: For Petrol Engine Model
Excessive engine oil
consumption – Oil
entering combustion
chamber
Sticky piston ring
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D”
Worn piston and cylinder
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D”
Worn piston ring groove and ring
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D”
Improper location of piston ring gap
“Pistons, Piston Rings, Connecting Rods and
Cylinders Disassembly and Assembly: For J20
Engine in Section 1D” or “Pistons, Piston
Rings, Connecting Rods and Cylinders
Disassembly and Assembly: For M16A Engine
with VVT in Section 1D”
Worn or damaged valve stem seal
“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”
Worn valve stem
“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”
Engine hesitates –
Momentary lack of
response as accelerator
is depressed. Can occur
at all vehicle speeds.
Usually most severe when
first trying to make
vehicle move, as from a
stop sign
Spark plug faulty or plug gap out of
adjustment
“Spark Plug Inspection: For Petrol Engine
Model in Section 1H”
Leaky high-tension cord (for M16
engine)
“High-Tension Cord Inspection (For M16
Engine): For Petrol Engine Model in Section
1H”
Fuel pressure out of specification
“Fuel Pressure Check: For Petrol Engine
Model”
Malfunctioning EGR valve
“EGR Valve Inspection: For Petrol Engine
Model in Section 1B”
Poor performance of ECT sensor or
MAF sensor
“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”
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection: For Petrol Engine Model in Section
1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection: For Petrol Engine Model
in Section 1C”
Faulty fuel injector
“Fuel Injector Circuit Check: For Petrol Engine
Model”
Faulty ECM
Engine overheating
Condition “Engine overheating”
Low compression
“Compression Check: For J20 Engine in
Section 1D” or “Compression Check: For
M16A Engine with VVT in Section 1D”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Condition
Possible cause
Correction / Reference Item
Engine General Information and Diagnosis: For Petrol Engine Model 1A-58
Surge – Engine power
variation under steady
throttle or cruise. Feels
like vehicle speeds up
and down with no change
in accelerator pedal
Leaky or loosely connected high-tension
cord (for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine): For Petrol Engine Model in
Section 1H”
Faulty spark plug (excess carbon
deposits, improper gap, burned
electrodes, etc.)
“Spark Plug Inspection: For Petrol Engine
Model in Section 1H”
Variable fuel pressure
“Fuel Pressure Check: For Petrol Engine
Model”
Kinky or damaged fuel hose and lines
Faulty fuel pump (clogged fuel filter)
Malfunctioning EGR valve
“EGR Valve Inspection: For Petrol Engine
Model in Section 1B”
Poor performance of MAF sensor
Faulty fuel injector
“Fuel Injector Circuit Check: For Petrol Engine
Model”
Faulty ECM
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection: For Petrol Engine Model in Section
1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection: For Petrol Engine Model
in Section 1C”
Excessive detonation –
Engine makes
continuously sharp
metallic knocks that
change with throttle
opening. Sounds like pop
corn popping
Faulty spark plug
“Spark Plug Inspection: For Petrol Engine
Model in Section 1H”
Loose connection of high-tension cord
(for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine): For Petrol Engine Model in
Section 1H”
Engine overheating
Condition “Engine overheating”
Clogged fuel filter (faulty fuel pump) or
fuel lines
“Fuel Pressure Check: For Petrol Engine
Model” or “Fuel Pump and Its Circuit Check:
For Petrol Engine Model”
Air drawn in through intake manifold or
throttle body gasket
Malfunctioning EGR valve
“EGR Valve Inspection: For Petrol Engine
Model in Section 1B”
Poor performance of knock sensor, ECT
sensor or MAF sensor
“DTC P0327 / P0328: Knock Sensor Circuit
Low / High: For Petrol Engine Model”, “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”
Faulty fuel injector(s)
“Fuel Injector Circuit Check: For Petrol Engine
Model”
Faulty ECM
Excessive combustion chamber
deposits
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D” and/or “Piston Pins
and Connecting Rods Inspection: For M16A
Engine with VVT in Section 1D”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Condition
Possible cause
Correction / Reference Item
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