Description Of The Electric System - KTM 2003 950 Adventure Repair Manual

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DESCRIPTION OF THE ELECTRIC SYSTEM

Fuel pump relay:
A positive charge travels to the start/stop switch via the ignition switch and a fuse (10 amperes), then via the diode to the relay
coil (positive side). The ground for the relay coil is switched for several seconds by the control unit with the ignition on during
the starting process. The control is maintained as long as the engine is running. If the engine fails to start, Stalls or is switched
off, the control unit will immediately break the ground connection, also in case of a crash (roll sensor).
The positive charge for the load contact on the fuel pump relay travels via the ignition switch and the fuse (10 amperes), the
other side of the load contact leads to the fuel pump and from the fuel pump to the ground.
Main relay:
The positive charge travels to the start/stop switch via the ignition switch and a fuse (10 amperes), then via the diode to the relay
coil (positive side). The 2nd side of the relay coil is directly connected to the ground.
The positive charge for the load contact on the fuel pump relay travels via the ignition switch and the fuse (10 amperes); the
other side of the load contact supplies the following components with on-board voltage (orange cable/or): control unit, heater for
both lambda probes, both ignition coils, the secondary air valve and both injection nozzles.
Sensors:
All of the sensors (except the pulse generator) and both lambda probes are connected to the control unit ground by a black cable
(bl).
All of the sensors that have a 3-pole connector are supplied with control unit positive (5 volts) via a blue cable (bu).
Sensor information is transmitted to the control unit via the 2nd cable (temperature sensors) or via the 3rd cable (3-pole
sensors).
The lambda probe signal is transmitted via the red/green cable (re/gn; front cylinder) and red/brown (re/br; rear cylinder), the
control unit actuates the lambda probe heater through the ground circuit via the white/black (wh/bl; front cylinder) and
white/orange (wh/or; rear cylinder); the positive charge for the lambda probe heater comes from the main relay.
The pulse generator is an inductive sensor and directly connected to the control unit by 2 poles.
Actuators:
The ignition coils, injection nozzles and the valves for the secondary air system are ground-controlled, i.e. the respective
component is actuated as soon as the control unit transmits the ground.
The two stepping motors for the idle and the 2nd throttle valve each have 2 coils that are activated by the control unit until the
desired position is reached; the throttle valve sensors emit a feedback signal for the position.
Additional control unit outputs:
Tachometer, cooling liquid temperature and "FI" error lamp