Suzuki Grand Vitara JB416 / JB420. Manual — part 25
1A-49 Engine General Information and Diagnosis:
Engine Symptom Diagnosis
S5JB0A1104010
Perform troubleshooting referring to the followings when ECM has detected no DTC and no abnormality has been
found in “Visual Inspection” and “Engine Basic Inspection”.
Condition
Possible cause
Correction / Reference Item
Hard starting (Engine
cranks OK)
Faulty spark plug
“Spark Plug Inspection in Section 1H”
Leaky high-tension cord (for M16
engine)
“High-Tension Cord Inspection (For M16
Engine) in Section 1H”
Loose connection or disconnection of
high-tension cord(s) or lead wire(s) (for
M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine) in Section 1H”
Faulty ignition coil
“Ignition Coil Assembly (Including ignitor)
Inspection in Section 1H”
Dirty or clogged fuel hose or pipe
Malfunctioning fuel pump
Air drawn in through intake manifold
gasket or throttle body gasket
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty ECT sensor or MAF sensor
“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Mass Air Flow
(MAF) and Intake Air Temperature (IAT)
Sensor Inspection in Section 1C”
Faulty ECM
Low compression
“Compression Check: For M16A Engine with
VVT in Section 1D” or “Compression Check:
For J20 Engine in Section 1D”
Poor spark plug tightening or faulty
gasket
“Spark Plug Removal and Installation in
Section 1H”
Compression leak from valve seat
“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”.
Sticky 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”.
Weak or damaged valve springs
“Valve Spring Inspection: For J20 Engine in
Section 1D” or “Valve Spring Inspection: For
M16A Engine with VVT in Section 1D”
Compression leak at cylinder head
gasket
“Cylinder Head Inspection: For J20 Engine in
Section 1D” or “Cylinder Head Inspection: For
M16A Engine with VVT in Section 1D”
Sticking or damaged 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, ring or 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”
Malfunctioning PCV valve
“PCV Valve Inspection in Section 1B”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Faulty EGR system
Engine General Information and Diagnosis: 1A-50
Low oil pressure
Improper oil viscosity
“Engine Oil and Filter Change in Section 0B”
Malfunctioning oil pressure switch
“Oil Pressure Switch Inspection in Section 9C”
Clogged oil strainer
“Oil Pan and Oil Pump Strainer Cleaning: For
J20 Engine in Section 1E” or “Oil Pan and Oil
Pump Strainer Cleaning: For M16A Engine
with VVT in Section 1E”
Functional deterioration of oil pump
“Oil Pump Inspection: For J20 Engine in
Section 1E” or “Oil Pump Inspection: For M16A
Engine with VVT in Section 1E”
Worn oil pump relief valve
“Oil Pump Inspection: For J20 Engine in
Section 1E” or “Oil Pump Inspection: For M16A
Engine with VVT in Section 1E”
Excessive clearance in various sliding
parts
Engine noise – Valve
noise
NOTE
Before checking
mechanical noise, make
sure that:
• Specified spark plug is
used.
• Specified fuel is used.
Improper valve lash
“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”
Worn valve stem and guide
“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”.
Weak or broken valve spring
“Valve Spring Inspection: For J20 Engine in
Section 1D” or “Valve Spring Inspection: For
M16A Engine with VVT in Section 1D”
Warped or bent valve
“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 noise – Piston,
ring and cylinder noise
NOTE
Before checking
mechanical noise, make
sure that:
• Specified spark plug is
used.
• Specified fuel is used.
Worn piston, ring and cylinder bore
“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”
Condition
Possible cause
Correction / Reference Item
1A-51 Engine General Information and Diagnosis:
Engine noise –
Connecting rod noise
NOTE
Before checking
mechanical noise, make
sure that:
• Specified spark plug is
used.
• Specified fuel is used.
Worn piston, ring and cylinder bore
“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 rod bearing
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Crank Pin and
Connecting Rod Bearings Inspection: For
M16A Engine with VVT in Section 1D”
Worn crank pin
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Crank Pin and
Connecting Rod Bearings Inspection: For
M16A Engine with VVT in Section 1D”
Loose connecting rod nuts
“Pistons, Piston Rings, Connecting Rods and
Cylinders Removal and Installation: For J20
Engine in Section 1D” or “Pistons, Piston
Rings, Connecting Rods and Cylinders
Removal and Installation: For M16A Engine
with VVT in Section 1D”
Low oil pressure
Condition “Low oil pressure”
Engine noise –
Crankshaft noise
NOTE
Before checking
mechanical noise, make
sure that:
• Specified spark plug is
used.
• Specified fuel is used.
Low oil pressure
Condition “Low oil pressure”
Worn bearing
“Main Bearings, Crankshaft and Cylinder Block
Inspection: For J20 Engine in Section 1D” or
“Main Bearings Inspection: For M16A Engine
with VVT in Section 1D”
Worn crankshaft journal
“Main Bearings, Crankshaft and Cylinder Block
Inspection: For J20 Engine in Section 1D” or
“Crankshaft Inspection: For M16A Engine with
VVT in Section 1D”
Loose bearing cap bolts
“Main Bearings, Crankshaft and Cylinder Block
Removal and Installation: For J20 Engine in
Section 1D” or “Main Bearings, Crankshaft and
Cylinder Block Removal and Installation: For
M16A Engine with VVT in Section 1D”
Excessive crankshaft thrust play
“Main Bearings, Crankshaft and Cylinder Block
Inspection: For J20 Engine in Section 1D” or
“Crankshaft Inspection: For M16A Engine with
VVT in Section 1D”
Condition
Possible cause
Correction / Reference Item
Engine General Information and Diagnosis: 1A-52
Engine overheating
Inoperative thermostat
“Thermostat Inspection in Section 1F”
Poor water pump performance
“Water Pump Inspection in Section 1F”
Clogged or leaky radiator
“Radiator On-Vehicle Inspection and Cleaning
in Section 1F”
Improper engine oil grade
“Engine Oil and Filter Change 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” or “Radiator Cooling Fan High
Speed Control System Check”
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
Poor gasoline mileage
Leaks or loose connection of high-
tension cord (for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine) in Section 1H”
Faulty spark plug (improper gap, heavy
deposits and burned electrodes, etc.)
“Spark Plug Inspection in Section 1H”
Malfunctioning EGR valve
“EGR Valve Inspection 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 in Section 1C” or “Mass Air Flow
(MAF) and Intake Air Temperature (IAT)
Sensor Inspection in Section 1C”
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty fuel injector(s)
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 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”
Condition
Possible cause
Correction / Reference Item
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