1998 Mariner Optimax Throttle Position Sensor

Joined
Jul 5, 2006
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1
Anyone know how to test a throttle position sensor for a 1998 Optimax 135 HP fuel injected outboard. I am getting the engine warning frequently. It stops when I shift into neutral and back into gear. I have read where this is a common problem with these motors. Mine has two of these sensors, about $120 each. According to the manual a combination of horn, light, and slowing to 3500 RPM means one is faulty. If I could confirm which is the problem I would gladly replace it. The motor is on a pontoon which is in a slip so I have no way to get it to a dealer.
 
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