FUEL INJECTION / IGNITION / EXHAUST SYSTEMS
5.28
2004 Four Stroke PWC Service Manual
ECU / ECU Connections
The wiring harness connections at the ECU are a latching type. Extreme care must be taken when handling the
connectors.
1. Remove connectors from front to back.
Re--install from back to front.
2. Unlock connector by pushing tab in, then rotate
connector upwards. Re--install by pressing
connector into ECU, then rotate connector down
until audible “click” is heard.
Adaptation
The ECU runs in a closed--loop configuration between
idle speed and 4000 RPM when not under accelera-
tion. During the closed--loop configuration, the lambda
sensor relays the amount of oxygen within the exhaust
stream to the ECU. The ECU adjusts the fuel supply
to achieve “lambda 1”.
The ECU operates in the open--loop mode whenever
the engine is accelerating or engine RPM exceeds
4000 RPM. In this mode, the ECU delivers the exact
amount of fuel the engine requires to satisfy the torque
demands of the operator for maximum performance.
Over time, normal wear and tear will occur to internal
engine components. The ECU will constantly learn
and adapt to the changing combustion characteristics
and maintain optimum engine performance.
FRONT REAR
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