Checking The Knock Sensor; Checking The Engine Shut-Off Switch - Yamaha F225F Service Manual

7. Disconnect the engine ECM coupler k.
8. Check the wiring harness for continuity.
k
P B
Wiring harness continuity:
Pink (P)–Terminal 71
Black (B)–Terminal 77
9. Connect the engine ECM coupler k.
10. Install the thermoswitches, and then
connect the thermoswitch connectors.

Checking the knock sensor

1. Disconnect the knock sensor coupler a.
2. Measure the knock sensor resistance.
k
71
77
a
Ignition unit and component
Knock sensor resistance:
504.0–616.0 kΩ at 20 °C (68 °F)
3. Disconnect the engine ECM coupler b.
4. Check the wiring harness for continuity.
b
a
1
Wiring harness continuity:
Terminal 1–Terminal 83
5. Connect the engine ECM coupler b and
knock sensor coupler a.

Checking the engine shut-off switch

1. Disconnect the engine start switch cou-
pler or main switch coupler.
2. Turn the engine start switch to ON, and
then check the engine shut-off switch for
continuity between the terminals a and
b.
b
83
5-52
0
1
2
3
4
5
6
7
8
9
10
A