In order for our ECU to operate correctly, it requires the Throttle Position Sensor (TPS) to be centered. In many cases, your ATV was delivered from the factory with it offset to one side.
This will cause hard starting, poor throttle response, and stalling with our ECU. Centering the TPS is easy, and has been outlined in the following instructions:
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If you no longer have a functioning stock ECU to center the TPS, you can also use a voltmeter.
The TPS has three wires. When looking at the connector, one outside wire is +5V power for the sensor, the other outside wire is ground. With the key on, measure the voltage between the center wire and one of the outside wires. A centered TPS will measure 1.12V. If you are seeing a ~4V reading, you need to measure the center wire to the other outside wire.
The TPS can also be checked for proper operation with a voltmeter. It should indicate ~1V at no throttle. As you slowly increase the throttle, it should increase to ~4V. If the voltage does not change, skips, jumps, or drops to zero during the slow acceleration, then the TPS is defective, and needs to be replaced.
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