Repair manual

SULEV 2.0L TFSI Engine
43
Radiator Identification
Sensor G611
Requirements
The purpose of Radiator Identification Sensor G611 is to
prevent:
– PremAir
®
radiator from being removed and replaced
with a non-PremAir
®
radiator
– G611 from being removed for the purpose of
reproducing the electronics or software
– G611 from being extensively cut out of the radiator
and installed “elsewhere”
The requirements relating to Radiator Identification
Sensor G611 are met as follows.
To check for the presence of the radiator, pre-determined
distinguishing features (IDs) are stored in the ECM and in
G611, and exchanged electronically.
Information is exchanged via LIN bus according to
the master-slave principle. This means that Radiator
Identification Sensor G611 is interrogated by the ECM.
The IDs are transmitted in an encrypted form after the
engine is started. If the codes no longer match (for
example, due to tampering), a fault will be indicated.
Integrated Temperature Sensor
A temperature sensor (NTC, Negative Temperature
Coefficient) measures the temperature at the point of
installation. This temperature is compared in the ECM
with the temperature from Engine Coolant Temperature
Sensor G62. The measured temperatures are transmitted
to the ECM via LIN bus. In the ECM, the values are
compared with a characteristic map and evaluated.
The temperature sensor is located in a specially shaped
spigot on the sensor housing. During assembly, the
sensor is bonded directly to a mounting base on the
radiator.
The temperature sensor is made of cast polyurethane
resin and is non-removable once attached. If, however, an
attempt is made to remove the temperature sensor, the
sensor spigot will break away from the housing causing
it to become irreparably damaged, both electrically and
mechanically.
This is a safeguard to ensure that all attempts at
tampering will be detected. In the event of misuse,
Malfunction Indicator Light K83 will be activated. In this
case, both the radiator and Radiator Identification Sensor
G611 must be replaced.
Circuit Diagram
Mounting Base
for Sensor Spigot
in Radiator
Corrugated
Cable
Protection Tube
Radiator
Identification
Sensor G611
(PremAir
®
sensor)
Legend
G611 Radiator Identification Sensor
J623 Engine Control Module (ECM)
Term 87 Main Relay, 12 Volt Power Supply
S Fuse
Positive
Ground
LIN bus
1,2,3 Pins on Control Unit