Suzuki Grand Vitara XL-7 Service Manual page 83

Condition
Overheating
Excessive engine oil
consumption
Low oil pressure
ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM) 6-23
Possible Cause
D Insufficient coolant
D Loose water pump belt
D Inoperative thermostat
D Poor water pump performance
D Clogged or leaky radiator
D Improper engine oil grade
D Clogged oil filter or oil strainer
D Not enough oil
D Poor oil pump performance
D Oil leakage
D Dragging brakes
D Slipping clutch
D Blown cylinder head gasket
Oil leakage
D Loose oil drain plug
D Loose oil pan bolts
D Deteriorated or broken oil pan sealant
D Leaky crankshaft oil seal
D Leaky cylinder head cover gasket
D Improper tightening of oil filter
D Loose oil pressure switch
D Blown cylinder head gasket
D Leaky crankshaft pulley oil seal
Oil entering combustion chamber
D Sticky piston ring
D Worn piston and cylinder
D Worn piston ring groove and ring
D Improper location of piston ring gap
D Worn or damaged valve stem seal
D Worn valve stem
D Improper oil viscosity
D Malfunctioning oil pressure switch
D Not enough oil
D Clogged oil strainer
D Functional deterioration of oil pump
D Worn oil pump relief valve
D Excessive clearance in various sliding
parts
Reference Item
Replenish.
Adjust.
Replace.
Replace.
Flush, repair or replace.
Replace with proper grade oil.
Replace or clean (oil strainer).
Replenish.
Repair or replace.
Repair.
Repair or replace.
Repair or replace.
Replace.
Tighten.
Tighten.
Replace sealant.
Replace.
Replace.
Tighten.
Tighten.
Replace.
Replace.
Remove carbon and replace rings.
Replace or rebore cylinder, and
replace piston.
Replace piston and ring.
Reposition ring gap.
Replace.
Replace.
Use oil of proper viscosity.
Replace.
Replenish.
Clean.
Replace.
Replace.
Replace worn parts.