Crankshaft Position (Ckp) Sensor; Electronic Control Module - Kohler KG2204 Service

1.5. Crankshaft Position (CKP)
Sensor
Figure 1-6 Crankshaft Position Sensor
The crankshaft position (CKP) sensor measures the
rotary speed and crankshaft turning angle. The ECM
ensures the ignition timing for each cylinder depending
on the turning signal. The sensor, which consists of a
permanent magnet and coil, is installed on the timing
gear cover next to the crankshaft pulley. When the
crankshaft is turning, the gear ring passes the sensor
at different speeds and causes a change of magnet
resistance at the sensor to produce a changeable
signal.
As the engine starts to crank, the crank position sensor
(CS) sends a small AC signal to the ECM. The ECM
uses this signal for speed sensing and engine timing.
With this CS signal now active, the ECM will send a
signal to the electronic throttle (ETC) opening the
throttle for fuel flow and initiate the firing of the
electronic ignition (Cyl 1, Cyl 2). The ignition system is
a waste spark design, meaning two cylinders fire at the
same time. One cylinder will fire on its compression
stroke and the other will fire on the exhaust stroke
(waste spark).
The ECM uses the signal from the crankshaft position
sensor to determine where each piston is in relation to
its combustion cycle and to activate the ignition control
module.
14 Fuel System Overview

1.6. Electronic Control Module

Figure 1-7 Electronic Control Module
To obtain maximum and accurate control of the air fuel
ratio, the engine is equipped with an onboard computer
or Electronic Control Module (ECM). The ECM
receives input data from sensors mounted to the
engine and fuel system and then outputs various
signals to control engine operation.
The ECM adjusts the engine speed, ignition timing, and
fuel supply in response to changes in the applied load,
surrounding air temperature, operating temperature of
the engine, and amount of oxygen present in the
exhaust.
TP-6903 5/16a