Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 26

1A-51 Engine General Information and Diagnosis: For Petrol Engine Model

13 Check fuel injector for operation

1) Install spark plugs and connect injector connectors.
2) Using sound scope (1), check operating sound of each

injector (2) when cranking engine.

Was injector operating sound heard from all injectors?

Go to “Engine Symptom
Diagnosis: For Petrol
Engine Model”.

Go to “Fuel Injector
Circuit Check: For
Petrol Engine Model”.

Step

Action

Yes

No

I3RM0A110015-01

Engine General Information and Diagnosis: For Petrol Engine Model 1A-52

Engine Symptom Diagnosis

S6JB0A1114010

Perform troubleshooting referring to the followings when ECM has detected no DTC and no abnormality has been
found in “Visual Inspection: For Petrol Engine Model” and “Engine Basic Inspection: For Petrol Engine Model”.

Condition

Possible cause

Correction / Reference Item

Hard starting (Engine
cranks OK)

Faulty spark plug

“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”

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): For Petrol Engine Model in
Section 1H”

Faulty ignition coil

“Ignition Coil Assembly (Including ignitor)
Inspection: For Petrol Engine Model in Section
1H”

Dirty or clogged fuel hose or pipe

“Fuel Pressure Check: For Petrol Engine
Model”

Malfunctioning fuel pump

“Fuel Pressure Check: For Petrol Engine
Model”

Air drawn in through intake manifold
gasket or throttle body gasket
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 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 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: For
Petrol Engine Model 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”.

1A-53 Engine General Information and Diagnosis: For Petrol Engine Model

Hard starting (Engine
cranks OK)

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: For Petrol Engine
Model 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

“EGR System Inspection: For Petrol Engine
Model in Section 1B”

Low oil pressure

Improper oil viscosity

“Engine Oil and Filter Change (Petrol Engine
Model) 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”.

Condition

Possible cause

Correction / Reference Item

Engine General Information and Diagnosis: For Petrol Engine Model 1A-54

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”

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