Suzuki GA413 Service Manual page 800

6-24 ENGINE GENERAL INFORMATION AND DIAGNOSIS
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
Hard Starting
(Engine cranks OK)
Possible Cause
Ignition system out of order
D Faulty ignition coil or high-tension cord
Engine and emission control system out
of order
D Faulty CMP sensing rotor or CKP sensing
rotor
D Faulty idle air control system
D Faulty ECT sensor, TP sensor, CKP sensor,
CMP sensor or MAP sensor
D Fuel pressure out of specification
D Faulty fuel injector
D Faulty ECM
D Malfunctioning PCV system
Low compression
D Improper valve lash
D Improper valve timing
D Compression leak from valve seat
D Sticky valve stem
D Weak or damaged valve springs
D Compression leak at cylinder head gasket
D Sticking or damaged piston ring
D Worn piston, ring or cylinder
D Faulty fuel pressure control valve
Referring Item
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.