FAILURE DIAGNOSTIC LIST
1-224
TNV DI Service Manual
Failure Diagnostic List
Supercharger
Floor contamination
c
c
c
Floor cleaning
See"Washing Procedure" (on page 10-
12).
Operation defect of waste gate
c
c
c
Disassembling and inspection
See "Waste Gate Valve Test" (on page
10-14).
Wear of radial metal
c
c
c
Disassembling and inspection
See "Radial Bearing" (on page 10-11).
Cooling
water syste
m
Radiator super cooled
c
c
c
Thermostat replacement
See "Disassembly of Engine Coolant
Pump" (on page 8-10).
Insufficient radiator cooling
c
c
c
Thermostat replacement
or check for fan belt loose
See "Disassembly of Engine Coolant
Pump" (on page 8-10) or "Check and
Adjust Cooling Fan V-Belt" (on page 5-
22).
Insufficient cooling water quantity
c
c
c
Water leak inspection of cooling water
system
See "Engine Coolant System Check" (on
page 8-8).
Water jacket cracks
c
c
c
Repair or replacement
See "Disassembly of Engine Coolant
Pump" (on page 8-10).
Fan belt elongation
c
c
c
Adjustment of belt tension
See "Check and Adjust Cooling Fan V-
Belt" (on page 5-22).
Thermostat fault
c
c
c
c
Inspection or replacement
See "Disassembly of Engine Coolant
Pump" (on page 8-10).
Lubricant system
Incorrect lubricant
c
c
c
c
c
c
Usage of correct lubricant
See "Engine Oil Specifications" (on page
4-15).
Lubricant system leakage
c
c
Repair
See "Disassembly of Oil Pump" (on page
9-10).
Insufficient discharge rate of trochoid
pump
c
Inspection and repair
See "Disassembly of Oil Pump" (on page
9-10).
Lubricant filter clogged
c
c
Cleaning or replacement
See "Replace Engine Oil and Engine Oil
Filter" (on page 5-20).
Regulator valve fault
c
Cleaning, adjustment or replacement
See "Disassembly of Oil Pump" (on page
9-10).
Insufficient lubricant quantity
c
c
Replenishment of correct lubricant
See "Adding Engine Oil" (on page 4-17).
Excess filling into crankcase
c
c
c
Engine oil check
See "Adding Engine Oil" (on page 4-17).
Symptoms and conditions of failures
Cause
Defective start
Engine stall
after start
Defective rotation control
Insufficient
engine output
Noise/vibration
Lubricant
Cooling
water
Intake
Exhaust
Fuel
Electrics/electronics
Action
Referenced page number
Starter not
rotate
Starter
rotates
Exhaust
fume
Speed change
by accelerator n
o
t available (constant sp
eed)
Without load
At work
Exhaust color
Knocking noise at combustion to
o high
Combu
s
tion noise
uneven
Noise other t
han combustion from engine
Engine vibration
too big
Lubricant consumption too much
Lubricant dilu
ted with fuel
Lubricant mixe
d wit
h water
Oil pre
s
sure to
o low
(oil pressure lamp
on)
Overheated (water temperat
ure lamp on)
Water
temperature too low
Pressure dow
n (air cleaner lamp on)
Pr
essur
e
up
At work
Blow-by too much
Exhaust
temperatu
re up
Fu
el consumption too much
Fu
el mixed with water (oil-water separator
lamp on
)
Fu
el filter contaminated too e
arly
Battery charg
e defect (charge
lamp o
n)
ECU indica
tor lamp flashing
ECU indica
tor lamp not on just after key-on
(2 seco
nds)
Prescribed ECU control fun
c
tion not op
erate
Fu
se meltdow
n, disconnection
(repe
ated)
ECU indica
tor lamp not on just after key-on
ECU indica
tor lamp on just
after key-on (2 se
conds)
Engine not start (not even initial comb
ustion)
Engine not start (stall after serial combustion)
Engine starts la
ter then e
v
er
None
Little
Much
Specified speed setti
ng not available
Poor acceleration
Retu
rn to low speed not
smooth
Hunt
ing
Hunt
ing
Nor
m
al
White
Blac
k
White exh
aust color
Black exhaust color
TNV_DI_SM_A4-Troubleshooting.book 224 ページ ２００７年１１月１５日 木曜日 午後５時２７分
