Checking The Knock Sensor; Checking The Engine Start Switch - SELVA MARINE Grey Whale 200 EFI Service Manual

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4. Turn the engine start switch to "OFF."
5. Disconnect the test harness (2 pins) 1
from the neutral switch coupler (wiring
harness end) and connect it to the neu-
tral switch coupler (neutral switch end).
6. Check the neutral switch for continuity.
Replace if there is no continuity at posi-
tion b.
a
b
B L/G
1
G
G/W
B L/G
Switch
Blue/green
position
Free a
Push b
7. Disconnect the test harness (2 pins) 1
from the neutral switch coupler (blue),
and then connect the neutral switch cou-
pler (blue).

Checking the knock sensor

1. Disconnect the knock sensor coupler 1
and connect the tester leads to the sen-
sor coupler and ground.
8-25
Electrical system
L/G
B
G/W
G
a
b
a
S6AL8410
Lead color
Black (B)
(L/G)
1
2. Measure the knock sensor resistance.
Check the installation (ground state) of
the knock sensor if out of specification.
NOTE:
To check the installation of the knock sensor,
the cylinder head must be removed.
Knock sensor resistance:
504–616 kΩ
3. Disconnect the tester leads from the sen-
sor coupler and ground and connect the
knock sensor coupler 1.

Checking the engine start switch

1. Disconnect the 10-pin main harness cou-
pler.
2. Check the engine start switch for continu-
ity at the 10-pin main harness coupler
(engine start switch end). Check the wir-
ing harness or replace the engine start
switch if there is no continuity.
ON
OFF
START
4
1
2
S6AL8530
ON
START
OFF
3
5
S6AL8890
6AL3J11