SELVA MARINE Grey Whale 200 EFI Service Manual page 386

TRBL
SHTG
Symptom 1: Unstable engine idle speed, poor acceleration, poor performance, or limited
engine speed
Symptom 2
Spark plug does not
spark
(some cylinders)
High-pressure fuel
line malfunction
(fuel pressure is
low)
Fuel not supplied
(some cylinders)
Low compression
pressure
WD: See the wiring diagram.
9-21
Troubleshooting
Cause 1
Spark plug malfunc-
tion
Short, open, or
loose connection in
ignition coil circuit
Ignition coil mal-
function
ECM malfunction
Pressure regulator
malfunction
High-pressure fuel
pump malfunction
Fuel injector mal-
function
Short, open, or
loose connection in
fuel injector circuit
ECM malfunction
Clogged fuel injec-
tor filter
Scratched piston
Damaged valve
Valve stuck to valve
guide
Cause 2 Checking step
Check the ignition
spark.
—
Check
plugs.
Check the wiring
— harness continuity.
Change the ignition
— coil and check the
ignition spark.
Change the ignition
— coil and check the
ignition spark.
Check the pressure
—
regulator.
Check
— pressure fuel pump
continuity.
Check
injector operation.
—
Measure the fuel
injector resistance.
Check the wiring
— harness continuity.
Change
injector and check
—
the
operation.
Replace
—
injector.
Measure the com-
pression pressure.
— Disassemble
check
unit.
Refer
to
page
3-8
8-18
the spark
WD
8-18
8-18
4-7
the high- 8-39
the fuel 8-38
WD
the fuel 4-23
8-38
fuel injector
the fuel 4-23
5-1
and
the power
6AL3J11