Suzuki Liana RH413, Service Manual

Page: 87 / 1302

Engine General Information and Diagnosis: 1A-36
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 “High-Tension Cord Inspection in Section 1H”
Fuel pressure out of specification “Fuel Pressure Check”
Malfunctioning EGR valve (if equipped) “EGR System Inspection (Using SUZUKI Scan
Tool) in Section 1B”
TP sensor, ECT sensor or MAP sensor “Throttle Position (TP) Sensor On-Vehicle
Inspection in Section 1C”, “Engine Coolant
Temperature (ECT) Sensor Inspection in
Section 1C” or “Manifold Absolute Pressure
(MAP) Sensor Inspection in Section 1C”
Fuel injector “Fuel Injector Circuit Check”
Faulty ECM
Inoperative thermostat
“Thermostat Inspection in Section 1F”
Poor water pump performance “Water Pump Inspection in Section 1F”
Clogged or leaky radiator “Radiator On-Vehicle Inspection and Cleaning
in Section 1F”
Improper engine oil grade “Engine Oil and Filter Change in Section 0B”
Clogged oil filter or oil strainer “Oil Pressure Check in Section 1E”
Poor oil pump performance “Oil Pressure Check in Section 1E”
Faulty radiator fan control system “Radiator Fan Control System Check”
Dragging brakes Condition “Dragging brakes” in “Brakes
Symptom Diagnosis in Section 4A”.
Slipping clutch Condition “Slipping clutch” in “Clutch System
Symptom Diagnosis in Section 5C”.
Blown cylinder head gasket Replace.
Low engine compression “Compression Check in Section 1D”
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 “High-Tension Cord Inspection in Section 1H”
Faulty spark plug (excess carbon
deposits, improper gap, and burned
electrodes, etc.) “Spark Plug Inspection in Section 1H”
Variable fuel pressure “Fuel Pressure Check”
Kinky or damaged fuel hose and lines
Faulty fuel pump (clogged fuel filter)
Malfunctioning EGR valve (if equipped)
“EGR System Inspection (Using SUZUKI Scan
Tool) in Section 1B”
Poor performance of MAP sensor “Manifold Absolute Pressure (MAP) Sensor
Inspection in Section 1C”
Faulty fuel injector “Fuel Injector Inspection in Section 1G”
Faulty ECM
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 “High-Tension Cord Inspection in Section 1H”
Clogged fuel filter (faulty fuel pump) or
fuel lines “Fuel Injector Circuit Check” or “Fuel Pump
and Its Circuit Check”
Air inhaling from intake manifold or
throttle body gasket
Malfunctioning EGR valve (if equipped)
“EGR System Inspection (Using SUZUKI Scan
Tool) in Section 1B”
Poor performance of knock sensor, ECT
sensor or MAP sensor “Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Manifold Absolute
Pressure (MAP) Sensor Inspection in Section
1C”
Faulty fuel injector(s) “Fuel Injector Circuit Check”
Faulty ECM
Excessive combustion chamber
deposits
Clean.
Condition Possible cause Correction / Reference Item