Service manual
90-898303
4-30
Main Power Relay
Typically, the starter draws 210 amps when cranking the engine, lowering the
voltage available from the battery. If the battery voltage available from the
battery is less than 7 volts during cranking, the Main Power Relay (MPR) may
not close or even remain closed during cranking, resulting in no spark, no
injector activity, or no voltage to the electric fuel pump. Under these conditions
the PCM concludes that the relay output circuit is at fault and sets a code,
which is stored in the Freeze Frame buffer of the DDT. The main power relay
fault is uncommon. Close examination of the MPR Freeze Frame buffer will
probably indicate a very low battery voltage condition when the fault was
recorded. The higher the frequency count, the more likely that the battery
voltage is low.
Stop Switch Circuit
To test for a shorted stop switch circuit:
1. Disconnect the key switch harness from the engine.
2. Turn the ignition key to the RUN position and make sure the lanyard switch
is in the RUN position.
3. Check for continuity between the BLACK/YELLOW and BLACK wires in the
key switch harness - there should be no continuity.
Example:
Connect meter leads between BLACK and BLACK/YELLOW pins. There
Should be “No Continuity”.
Shift Interrupt Switch
The shift interrupt switch reduces the torque load on the gear case
components to assist in shifting. The switch is monitored by the PCM, which
momentarily interrupts the fuel flow to three cylinders (#1, #2 and #4) when
engine speed exceeds 600 rpm in neutral.
• The DDT can monitor switch function. The DDT displays ON when the
outboard is in neutral and OFF when in gear.
• The switch is open when the outboard is in gear. A resistance test will
result in no continuity.
• The switch is closed when the outboard is in neutral. A resistance test will
result in continuity.
• If shift operation is difficult, shift interrupt switch function can be checked
by the DDT or an ohmmeter - for open or closed operation and for a
continuity check of the switch harness for shorts or open wiring.
Visually inspect the pins at the switch and the wires coming from the
connector. Look for broken, bent, or corroded pins at the sensor and loose,
broken, or corroded wires at the connector. Replace components as
necessary.
Notes
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