Suzuki 2006 SX4, Service Manual

Page: 95 / 1478

Engine General Information and Diagnosis: 1A-51
Poor gasoline mileage Faulty spark plug (improper gap, heavy
deposits and burned electrodes, etc.) “Spark Plug Inspection in Section 1H”
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 APP sensor assembly “Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty fuel injector(s) “Fuel Injector Circuit Check”
Faulty ECM “Inspection of ECM and Its Circuits”
Low compression “Compression Check in Section 1D”
Poor valve seating “Valves and Valve Guides Inspection in
Section 1D”
Dragging brakes “Brakes Symptom Diagnosis in Section 4A”
Slipping clutch (M/T model) “Clutch System Symptom Diagnosis in Section
5C”
Thermostat out of order “Thermostat Inspection in Section 1F”
Improper tire pressure “Tires Description in Section 2D”
Fuel pressure out of specification “Fuel Pressure Check”
Excessive engine oil
consumption – Oil
leakage Blown cylinder head gasket “Cylinder Head Inspection in Section 1D”
Leaky camshaft oil seals “Camshaft, Tappet and Shim Inspection in
Section 1D”
Excessive engine oil
consumption – Oil
entering combustion
chamber Sticky piston ring “Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning in Section
1D”
Worn piston and cylinder “Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning in Section
1D”
Worn piston ring groove and ring “Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning in Section
1D”
Improper location of piston ring gap “Pistons, Piston Rings, Connecting Rods and
Cylinders Disassembly and Reassembly in
Section 1D”
Worn or damaged valve stem seal “Valves and Valve Guides Inspection in
Section 1D”
Worn valve stem “Valves and Valve Guides Inspection 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”
Fuel pressure out of specification “Fuel Pressure Check”
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 APP sensor assembly “Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty fuel injector “Fuel Injector Circuit Check”
Faulty ECM “Inspection of ECM and Its Circuits”
Engine overheating Condition “Engine overheating”
Low compression “Compression Check in Section 1D”
Condition Possible cause Correction / Reference Item