Datsun 1980 200SX Service Manual page 25

Minor
TrrJUbleDiagnoses end
Correctiops
MAINTENANCE
Condition
ENGINE WILL CRANK
NORMALLY BUT WILL NOT START
Probable
cause Corrective action
In
this
case
the following trouble
causes
may
exist but
in many
cases
ignition
system
or
fuel
system
i1
in trouble
Ignition
system
in trouble
Fuel system
in
troubk
Valve mecluznism does
not
work
properly
Low compression
Trouble shooting procedure
Check
spark
plug fIrstly
by following procedure
Disconnect
high
tension cable from
one
spark plug
and hold
it
about
10
mm
0 3 9 in
from the
engine
metal
part
and crank the
engine
ENGINE CRANKS
NORMALLY
BUT
WI L OT
5
ART
Ignition
system
in
trouble
Fuel
system
malfunction
MA 16
Good
spark
occurs
a
Check
spark
plug
b Check ignition timing
c
Check fuel system
d Check revolution
trigger signal
e
Check cylinder compression
Very high current
Check
the current
flow
in
primary circuit
Inspect
primary circuit for short
Check distributor
pick
up coil
operation
Check IC
ignition
system
No spark
occurs
Low
or no
cunenL
Malfunctioning
distributor
pick
up coil
Improper air
gap
Leak at rotor
cap and
rotor
Malfunctiflning
spark
plug
Improper ignition timing
Malfunctioning ignition
coil
Disconnection
of high
tension
cable
Loose
connection
or
disconnection
41
primary
circuit
Irregnlar
revolution
trigger pulse
Malfunctioning
IC ignition
unit
Lack of fuel
Damaged
electronic fuel
injection
harness
or
relay
Malfunctioning fuel pump
Usten to
opera
ting
sound
Damaged control unit
Seized
injector
Usten
to
operating
sound
Malfunctioning air
flow
meter
Damaged
water
temp
sensor
Check for loose terminal
or
disconnection
in
primary
circuit
Check for burned
points
Replace
Adjust
Clean
or
replace
Clean
adjust plug
gap
or
replace
Adjust
Replace
Replace
Repair
or
replace
Replace IC ignition
unit
Replace
Supply
Replace
Replace
Replace
Replace
Replace
Repl
ce
For
inspection procedures
for
electronic fuel
injection
sys
tern
components
refer
to
Engine Fuel
section