MARUTI SUZUKI Wagon R, Manual

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1A-39 Engine General Information and Diagnosis: Bi-Fuel LPG model
Engine Symptom Diagnosis
AENAR90A1104012
Perform troubleshooting referring to the following when ECM and LPG control module has detected no DTC and no
abnormality has been found in “Visual Inspection”: Bi-Fuel LPG model and “Engine Basic Inspection”: Bi-Fuel LPG
model.
17 Check ignition spark
1) Check ignition spark. )
Is it in good condition?
Go to Step 18. Go to “Ignition System
Check”: in Section 1H.
18 Check LPG fuel injector for operation
1) Check LPG fuel injector.
)
Is it in good condition?
Go to “Engine Symptom
Diagnosis”: Bi-Fuel LPG
model Go to “Fuel Injector
Circuit Check”: in
Section .
Step Action Yes No
Condition Possible cause Correction / Reference Item
Hard starting (Engine can
be cranked) Faulty spark plug “Spark Plug Inspection”: in Section
Faulty ignition coil “Ignition Coil Assembly Inspection”: in Section
Dirty or clogged petrol and/or LPG fuel
hose or pipe “Fuel Pressure Check”: LPG in Section 1G
Malfunctioning fuel pump Refer to “Fuel Pump On-Vehicle Inspection: in
Section 1G in related manual mentioned in the
foreword.
Faulty petrol fuel injector(s) (Petrol
MODE or AUTO MODE) “Fuel Injector Circuit Check”: in Section
Faulty LPG fuel injector(s) (Forced LPG
MODE) “Fuel Injector Circuit Check”: in Section
Air drawn in through intake manifold
gasket or throttle body gasket Check air intake system.
Faulty throttle body assembly “Throttle Body On-Vehicle Inspection”: in
Section
Faulty ECT sensor or MAP sensor “ECT Sensor Inspection”: in Section or “MAP
Sensor Inspection”: in Section
Faulty ECM “Inspection of ECM and Its Circuit”: Bi-Fuel
LPG model
Faulty LPG control module “Inspection of LPG Control Module and Its
Circuit”: Bi-Fuel LPG model
Low compression “Compression Check”: in Section
Poor spark plug tightening or faulty
gasket “Spark Plug Removal and Installation”: in
Section
Compression leak from valve seat “Valve and Valve Guide Inspection”: in Section
Sticky valve stem “Valve and Valve Guide Inspection”: in Section
Weak or damaged valve springs “Valve Spring Inspection”: in Section
Compression leak at cylinder head
gasket “Cylinder Head Inspection”: in Section
Sticking or damaged piston ring “Cylinder, Piston and Piston Ring Inspection”:
in Section
Worn piston, piston ring or cylinder “Cylinder, Piston and Piston Ring Inspection”:
in Section
Malfunctioning PCV valve “PCV Valve Inspection”: in Section 1B
Low oil pressure Improper oil viscosity “Engine Oil and Filter Change”: in Section
Malfunctioning oil pressure switch “Oil Pressure Switch Inspection”: in Section
Clogged oil strainer Check oil strainer for clog.
Functional deterioration of oil pump “Oil Pump Inspection”: in Section
Worn oil pump relief valve “Oil Pump Inspection”: in Section
Excessive clearance in various sliding
parts —