Suzuki Grand Vitara JB416 / JB420. Manual — part 26
1A-53 Engine General Information and Diagnosis:
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”
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 in Section 1H”
Leaky high-tension cord (for M16
engine)
“High-Tension Cord Inspection (For M16
Engine) in Section 1H”
Fuel pressure out of specification
Malfunctioning EGR valve
“EGR Valve Inspection in Section 1B”
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
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: 1A-54
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) in Section 1H”
Faulty spark plug (excess carbon
deposits, improper gap, burned
electrodes, etc.)
“Spark Plug Inspection in Section 1H”
Variable fuel pressure
Kinky or damaged fuel hose and lines
Faulty fuel pump (clogged fuel filter)
Malfunctioning EGR valve
“EGR Valve Inspection in Section 1B”
Poor performance of MAF sensor
“Mass Air Flow (MAF) and Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty fuel injector
Faulty ECM
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”
Excessive detonation –
Engine makes
continuously sharp
metallic knocks that
change with throttle
opening. Sounds like pop
corn popping
Faulty spark plug
“Spark Plug Inspection in Section 1H”
Loose connection of high-tension cord
(for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine) in Section 1H”
Engine overheating
Condition “Engine overheating”
Clogged fuel filter (faulty fuel pump) or
fuel lines
“Fuel Pressure Check” or “Fuel Pump and Its
Circuit Check”
Air drawn in through intake manifold or
throttle body gasket
Malfunctioning EGR valve
“EGR Valve Inspection in Section 1B”
Poor performance of knock sensor, ECT
sensor or MAF sensor
“DTC P0327 / P0328: Knock Sensor Circuit
Low / High”, “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 fuel injector(s)
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
1A-55 Engine General Information and Diagnosis:
Engine has no power
Faulty spark plug
“Spark Plug Inspection in Section 1H”
Faulty ignition coil with ignitor
“Ignition Coil Assembly (Including ignitor)
Inspection in Section 1H”
Leaks, loose connection or
disconnection of high-tension cord (for
M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine) in Section 1H”
Faulty knock sensor
“DTC P0327 / P0328: Knock Sensor Circuit
Low / High”
Clogged fuel hose or pipe
Malfunctioning fuel pump
“Fuel Pump and Its Circuit Check”
Air drawn in through intake manifold
gasket or throttle body gasket
Engine overheating
Condition “Engine overheating”
Malfunctioning EGR valve
“EGR Valve Inspection in Section 1B”
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
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”
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”
Faulty intake manifold tuning vacuum
solenoid valve (for J20 engine)
“Vacuum Tank Assembly Inspection (For J20
Engine) in Section 1C”
Condition
Possible cause
Correction / Reference Item
Engine General Information and Diagnosis: 1A-56
Improper engine idling or
engine fails to idle
Faulty spark plug
“Spark Plug Inspection in Section 1H”
Leaky or disconnected high-tension cord
(for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine) in Section 1H”
Faulty ignition coil with ignitor
“Ignition Coil Assembly (Including ignitor)
Inspection in Section 1H”
Fuel pressure out of specification
Leaky manifold, throttle body, or cylinder
head gasket
Malfunctioning EGR valve
“EGR Valve Inspection in Section 1B”
Faulty evaporative emission control
system
“EVAP Canister Purge Inspection in Section
1B”
Faulty EGR system
“EGR System Inspection in Section 1B”
Faulty fuel injector(s)
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 ECM
Loose connection or disconnection of
vacuum hoses
Malfunctioning PCV valve
“PCV Valve Inspection in Section 1B”
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”
Faulty electric load parts (headlight,
blower motor and/or rear defogger)
“Electric Load Signal Circuit Check”
Faulty electric load current sensor (for
J20 engine)
“Electric Load Current Sensor On-Vehicle
Inspection (For J20 Engine) in Section 1C”
Faulty generator and/or its circuit
“DTC P0620: Generator Control Circuit” and
“DTC P0625 / P0626: Generator Field
Terminal Circuit Low / High”
Condition
Possible cause
Correction / Reference Item
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