05/Exhaust; Lambda Sensor; Lambda Sensor Heater - KTM 1190 RC8 R EU/UK 2009 Repair Manual

05/EXHAUST

Lambda sensor

9.1

Lambda sensor heater

9.2
Installation location
–
The lambda sensor for cylinder 1
–
The lambda sensor for cylinder 2
900007-61
Component description
–
In principle, the lambda sensor consists of a ceramic body
platinum layer on each side. The platinum layer functions like an electrode. The
outer layer comes into contact with the exhaust gas
ambient air
conductive and a voltage is generated when there is a difference in the oxygen con-
tent of the ambient air and the exhaust gas
content, the greater the voltage.
Lambda sensor for cylinder 1, connector CE (
Lambda sensor for cylinder 2, connector CE (
900008-10
Function description
–
All lambda (O₂) sensors are open to the atmosphere, which has an oxygen con-
tent (O₂) of approximately twenty one percent. The exhaust gas of a gasoline engine
contains up to two percent oxygen. The sensor output voltage is dependent on the
oxygen content in the exhaust gas stream. This means that when the exhaust gas
contains just two percent oxygen, the engine is running "lean" and the sensor gen-
erates a low voltage. When the exhaust gas contains almost zero percent oxygen,
the engine is running "rich" and the sensor generates a high voltage.
Lambda sensor
900009-01
Voltage range within
the closed loop range
"HEGO1AD"
Voltage range within
the closed loop range
"HEGO2AD"
Installation location
–
The lambda sensor heater for cylinder 1
cylinder 1, which is installed in the rear exhaust manifold.
–
The lambda sensor heater for cylinder 2
cylinder 2, which is installed in the front exhaust manifold.
Component description
–
The lambda sensor is heated internally by a ceramic heating element, so that inde-
pendent of the exhaust gas temperature the temperature of the lambda sensor is
kept constant. The connections of the heating element are completely isolated from
900007-61
the sensor signal voltage.
Lambda sensor for cylinder 1, connector CE (
Lambda sensor for cylinder 2, connector CE (
Description of function
–
The lambda sensor heater is supplied with battery voltage by the power relay. After
the engine is started, the EFI control unit switches the ground signal on/off to the
lambda sensor heater. In order to control the lambda sensor heater, the signal con-
trol is modulated.
The lambda sensor heater is controlled at a modulation frequency T of 100 Hz. The
smaller the duty cycle t₁ is set for the control, the greater is the supply voltage of
the lambda sensor heater.
Lambda sensor heater
900046-60
is installed in the rear exhaust manifold.

is installed in the front exhaust manifold.

. At a certain temperature, the ceramic body becomes electrically

0.2... 0.8 V
0.2... 0.8 V


that is coated with a

and the inner layer with

. The greater the difference in oxygen

p. 396) pin assignment
p. 396) pin assignment
is integrated into the lambda sensor for
is integrated into the lambda sensor for
p. 396) pin assignment
p. 396) pin assignment
62