Engine Electrical Devices: 1C-5
Trim Sensor
The trim sensor is variable resistor type.
With the sensor signal received, the ECM performs the
learning of the trim/tilt position and it controls the position
of both the trim down limit and the tilt up limit.
The trim sensor signal also operates the trim meter
through the ECM.
• Failure symptom:
In the event of sensor failure:
– The ECM performs the control on the assumption
that the sensor output is 3.9 V.
– The control of the trim down limit and the tilt up limit
becomes inoperative.
– The trim gauge indicates a full trim position.
NOTE
When the ECM has been replaced, the trim
sensor removed/reinstalled, or the mid unit
overhauled, resetting of both the tilt up limit
and trim down limit must be performed.
ECM Main Relay
The ECM main relay is installed in the fuse box.
When energized by turning the ignition switch “ON”,
battery voltage is supplied to the ECM, fuel injector,
ignition coil, IAC valve and high pressure fuel pump.
With the ignition switch in the “OFF” position, and the UP
or DOWN button of the PTT switch pressed, the main
relay turns “ON” to supply 12 V power to the ECM, which
then performs the on / off control of the PTT motor relay.
Cranking Switch Signal
The ECM detects if the engine is being started by the
position of ignition switch. When the ignition key is
turned to ST position, a voltage (12 V) signal is input to
the ECM.
The ECM in turn sets the ignition, fuel injection, IAC, etc.
to the starting mode.
When the key is turned to the IG position, after the
engine has been started, the input voltage becomes
approx. 2.5 V.
Ignition switch Signal
The ECM receives a power signal when the ignition
switch is turned “ON”, then sets the IAC valve to the
standard starting position.
1. Trim sensor
1. ECM main relay
1
I9J011130035-01
1
I9J011130036-02
1. Ignition switch 3. Starter motor relay
2. Neutral switch
1. Ignition switch
+12V
ECM
OFF
IG
ST
1
2 3
I9J011130004-03
+12V
ECM
OFF
IG
1
15
I9J011130037-01
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