Suzuki 2006 SX4 Service Manual page 98

1A-54 Engine General Information and Diagnosis:
Condition
Excessive hydrocarbon
(HC) emission or carbon
monoxide (CO)
Excessive nitrogen
oxides (NOx) emission
Possible cause
Faulty spark plug
Faulty ignition coil with ignitor
Low compression
Lead contamination of three way
catalytic converter
Faulty evaporative emission control
system
Fuel pressure out of specification
Closed loop system (A/F feedback
compensation) fails (Faulty TP sensor,
Poor performance of ECT sensor or
MAF sensor)
Faulty electric throttle body assembly
Faulty APP sensor assembly
Faulty injector(s)
Faulty ECM
Engine not at normal operating
temperature
Clogged air cleaner
Vacuum leaks
Improper ignition timing
Lead contamination of catalytic
converter
Fuel pressure out of specification
Closed loop system (A/F feedback
compensation) fails (Faulty TP sensor,
Poor performance of ECT sensor or
MAF sensor)
Faulty electric throttle body assembly
Faulty APP sensor assembly
Faulty injector(s)
Faulty ECM
Correction / Reference Item
"Spark Plug Inspection in Section 1H"
"Ignition Coil Assembly (Including ignitor)
Inspection in Section 1H"
"Compression Check in Section 1D"
Check for absence of filler neck restrictor.
"EVAP Canister Purge Inspection in Section
1B"
"Fuel Pressure Check"
"Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C", "Engine Coolant
Temperature (ECT) Sensor Inspection in
Section 1C" or "Mass Air Flow (MAF) and
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"
"Inspection of ECM and Its Circuits"
—
"Air Cleaner Filter Inspection and Cleaning in
Section 1D"
"Engine Vacuum Check in Section 1D"
"Ignition Timing Inspection in Section 1H"
Check for absence of filler neck restrictor.
"Fuel Pressure Check"
"Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C", "Engine Coolant
Temperature (ECT) Sensor Inspection in
Section 1C" or "Mass Air Flow (MAF) and
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"
"Inspection of ECM and Its Circuits"