Suzuki GA413 Service Manual page 304

6-12 ENGINE
Condition
Overheating
Poor gasoline
mileage
Possible Cause
D Inoperative thermostat
D Faulty radiator fan motor or its circuit
D Loose or slip water pump belt
D Poor water pump performance
D Clogged or leaky radiator
D Improper engine oil grade
D Clogged oil filter or oil strainer
D Poor oil pump performance
D Dragging brakes
D Slipping clutch
D Blown cylinder head gasket
Ignition system out of order.
D Faulty ignition coil or high-tension cord
Engine and emission control system out
of order.
D Fuel pressure out of specification
D Faulty TP sensor, ECT sensor or MAP
sensor
D Faulty EGR system (if equipped)
D Faulty injector
D Faulty ECM
Low compression
Others
D Poor valve seating
D Dragging brakes
D Slipping clutch
D Thermostat out of order
D Improper tire pressure
Reference Item
Thermostat in Section 6B.
Diag. Flow Table B-8 in Section 6E.
Water pump belt check in Section 6B.
Water pump in Section 6B.
Radiator in Section 6B.
Engine oil and oil filter change in
Section 0B.
Oil pressure check in Section 6A.
Oil pressure check in Section 6A.
Diagnosis in Section 5.
Diagnosis in Section 7C.
Cylinder head inspection in Section
6A.
Diagnosis in Section 6F.
Diag. Flow Table B-3 in Section 6E.
TP sensor, ECT sensor or MAP
sensor in Section 6E.
Diag. Flow Table B-6 in Section 6E.
Fuel injector injection volume inspec-
tion in Section 6E.
Inspection of ECM and its circuit in
Section 6E.
Previously outlined.
Valves inspection in Section 6A.
Diagnosis in Section 5.
Diagnosis in Section 7C.
Thermostat in Section 6B.