Suzuki SX4 Service Manual page 99

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Condition
Excessive detonation –
Engine makes
continuously sharp
metallic knocks that
change with throttle
opening. Sounds like pop
corn popping.
Engine has no power
Possible cause
Faulty spark plug
Loose connection of high-tension cord
Engine overheating
Clogged fuel filter (faulty fuel pump) or
fuel lines
Air drawn in through intake manifold or
throttle body gasket
Malfunctioning EGR valve
Poor performance of knock sensor, ECT
sensor or MAF sensor
Faulty fuel injector(s)
Faulty ECM
Excessive combustion chamber
deposits
Camshaft position control (VVT) system
out of order (for engine with VVT
system)
Faulty spark plug
Faulty ignition coil with ignitor
Leaks, loose connection or
disconnection of high-tension cord
Faulty knock sensor
Clogged fuel hose or pipe
Malfunctioning fuel pump
Air drawn in through intake manifold
gasket or throttle body gasket
Engine overheating
Malfunctioning EGR valve
Poor performance of ECT sensor or
MAF sensor
Faulty electric throttle body assembly
Faulty APP sensor assembly
Faulty fuel injector(s)
Faulty ECM
Dragging brakes
Slipping clutch (for M/T model)
Low compression
Camshaft position control (VVT) system
out of order (for engine with VVT
system)
Engine General Information and Diagnosis:
Correction / Reference Item
"Spark Plug Inspection in Section 1H"
"High-Tension Cord Removal and Installation
in Section 1H"
Condition "Engine overheating"
"Fuel Pressure Check" or "Fuel Pump and Its
Circuit Check"
"EGR Valve Inspection (If Equipped) in Section
1B"
"DTC P0327 / P0328: Knock Sensor Circuit
Low / High", "Engine Coolant Temperature
(ECT) Sensor Inspection in Section 1C" or
"Intake Air Temperature (IAT) Sensor
Inspection in Section 1C"
"Fuel Injector Circuit Check"
"Cylinders, Pistons and Piston Rings
Inspection in Section 1D" and/or "Piston Pins
and Connecting Rods Inspection in Section
1D"
"Oil Control Valve Inspection (For Engine with
VVT) in Section 1D"
"Spark Plug Inspection in Section 1H"
"Ignition Coil Assembly (Including Ignitor)
Inspection in Section 1H"
"High-Tension Cord Removal and Installation
in Section 1H"
"DTC P0327 / P0328: Knock Sensor Circuit
Low / High"
"Fuel Pressure Check"
"Fuel Pump and Its Circuit Check"
Condition "Engine overheating"
"EGR Valve Inspection (If Equipped) in Section
1B"
"Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C" or "Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C"
"Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C"
"Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C"
"Fuel Injector Circuit Check"
Condition "Dragging brakes" in "Brakes
Symptom Diagnosis in Section 4A"
Condition "Slipping clutch" in "Clutch System
Symptom Diagnosis in Section 5C" (for M/T
model)
"Compression Check in Section 1D"
"Oil Control Valve Inspection (For Engine with
VVT) in Section 1D"
1A-49

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