Suzuki GA413, Service Manual

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6-24 ENGINE GENERAL INFORMATION AND DIAGNOSIS
GA413
supple
ENGINE DIAGNOSIS TABLE
Perform troubleshooting referring to following table when ECM has no DTC and no abnormality found in visual
inspection and engine basic inspection previously.
Condition Possible Cause Referring Item
Hard Starting
(Engine cranks OK)
Ignition system out of order
Faulty ignition coil or high-tension cord
Engine and emission control system out
of order
Faulty CMP sensing rotor or CKP sensing
rotor
Faulty idle air control system
Faulty ECT sensor, TP sensor, CKP sensor,
CMP sensor or MAP sensor
Fuel pressure out of specification
Faulty fuel injector
Faulty ECM
Malfunctioning PCV system
Low compression
Improper valve lash
Improper valve timing
Compression leak from valve seat
Sticky valve stem
Weak or damaged valve springs
Compression leak at cylinder head gasket
Sticking or damaged piston ring
Worn piston, ring or cylinder
Faulty fuel pressure control valve
Diagnosis in Section 6F.
CMP sensing rotor or CKP sensing rotor
inspection in Section 6E.
Diagnostic Flow Table B-4
ECT sensor, TP sensor, CKP sensor,
CMP sensor or MAP sensor in Section
6E.
Diagnostic Flow Table B-3
Diagnostic Flow Table B-1
Inspection of ECM and its circuit in Sec-
tion 6E.
PCV hose and PCV valve in Section 6E.
Compression check in Section 6A.
Valve lash check in Section 6A.
Timing belt and belt tensioner in Section
6A.
Valves and cylinder head in Section 6A.
Valves and cylinder head in Section 6A.
Valves spring in Section 6A.
Valves and cylinder head in Section 6A.
Piston rings in Section 6A.
Pistons and piston rings in Section 6A.
Fuel pressure control valve in Section
6E.