3-31 ENGINE CONTROL SYSTEM
START- IN- GEAR PROTECTION SYSTEM
A switch to detect neutral gear position is located on the cylinder block (PORT side) and operated by the
clutch control arm.
This ON / OFF type switch is “ON” in neutral and “OFF” in forward or reverse.
On starting the engine, the ECM detects the shift position using the neutral switch. When the neutral switch is
“OFF”, the ECM does not send a signal for injector operation.
A switch to detect neutral gear position is also in the NA12S, binnacle and side mount remote control box’s.
This ON/OFF type switch is also “ON” in neutral and “OFF” in forward or reverse. When this switch is “OFF”, no
power is supplied to the starter motor relay preventing starter motor engagement.
Using the combination of neutral switches, the fuel supply circuit as well as the starter motor circuit is regu-
lated. The engine will not start, even by emergency rope, with the shift in the forward or reverse position.
Battery
charge
coil
Rectifier &
regulator
30A fuse
Battery
ECM
12V power supply
1 Neutral switch
2 Neutral switch
3 Ignition switch
4 Starter motor
5 Starter motor relay
6 ECM main relay
1
2
3
Remo-con box
OFF
ON
START
4
5
6
SHIFT POSITION
NEUTRAL
SWITCH
OPERATION
Fuel injector Ignition Fuel pump Starter motor
Neutral
O N Ye s Ye s Ye s Ye s
Forward / Reverse
OFF No Yes Yes No
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