DANGER! ENSURE THE THROTTLE IS NOT STICKING. A STICKING THROTTLE MAY RESULT IN UNCONTROLLED
ENGINE OR BOAT SPEED. THIS COULD CAUSE PROPERTY DAMAGE, PERSONAL INJURY, AND/OR
DEATH.
1. Start the engine. With the engine running at idle, insert a flat blade screwdriver into the head of the idle adjustment screw
located on the front of the throttle body on the driver’s side of the vehicle.
2. Turn the idle adjustment screw clockwise to increase the engine idle speed, or counterclockwise to decrease the engine idle
speed, until the engine speed is approximately 750 rpm.
17.0 SETTING THE THROTTLE POSITION SENSOR (TPS)
Figure 15
The setting of the throttle position sensor is critical in the operation of the Digital ECU and is best accomplished by using a digital
voltmeter. To adjust, follow the instructions carefully.
NOTE: Fuel delivery can NOT BE ADJUSTED by changing the positions of the TPS. The TPS must be set in the position
outlined below.
1. Unplug the three-position connector from the TPS and attach jumper wires between the TPS and the connector.
2. Remove a portion of the insulation on the jumper wires connecting to both the black and the blue wires leading to the TPS
as shown in Figure 15.
3. Attach the positive (+) lead of a digital volt meter to the jumper wire connected to the blue wire.
4. Attach the negative (-) lead of a digital volt meter to the jumper wire connected to the black wire.
5. Turn the ignition key to the “RUN” position. Do not start the engine.
6. Slightly loosen the two screws that hold the TPS in place with a Phillips screwdriver.
7. Adjust the TPS until the voltage between the blue and black wire measures 0.63 to 0.65 volts.
8. Tighten the two screws that hold the TPS in place and verify that the voltage between the blue and black wires on the TPS
continues to read between 0.63 to 0.65 volts. Readjust the TPS if necessary to obtain this voltage reading.
9. Turn the ignition key to the “OFF” position.
10. Remove the jumper wires and plug the three position connector back into the TPS, ensuring that the safety latch snap into
place.
NOTE: Once the TPS and mechanical idle have been set, y
ou are ready to tune the system.
To Next Page
Loading...