The system consists of a throttle valve with a re-
turn spring placed on the exhaust pipe. The valve
is closed via two cables actuated by an electric
motor, which, in turn, is connected electrically to
the instrument panel. The operating logic and mo-
tor control are, however, resident in the Marelli
injection control unit, which dialogues with the in-
strument panel via the CAN.
Level in electrical circuit diagram:
Exhaust butterfly valve
Location:
•
on the vehicle: The motor is placed in
the front lower part of the engine. The
valve in the exhaust duct.
•
connector: on the motor.
Electrical characteristics:
•
Electrical motor resistance (PIN 4-5):
2--4 Ohm
•
Potentiometer resistance (PIN 1-3):
10.1 kOhm +/- 10%
Pin out:
1. Power supply voltage 5V
2. Output signal (0- 5V)
3. Ground connection
4. Motor A supply
5. Motor B supply
DIAGNOSIS INSTRUMENT: PARAMETERS
Exhaust butterfly valve target position: 7 - 93
%
NOTE: Value that control unit sends to the instru-
ment panel to activate the valve: 7% (closed
valve), 93 % (open valve).
CAUTION
BEFORE CARRYING OUT ANY TROUBLESHOOTING,
CAREFULLY READ THE GENERAL TROUBLESHOOTING
CONCEPTS FOR ELECTRICAL DEVICES AT THE BEGIN-
NING OF THE CHECK AND CONTROL SECTION IN THE
ELECTRICAL SYSTEM CHAPTER.
DIAGNOSIS INSTRUMENT: STATUSES
Electrical system RSV4 Factory a-PRC
ELE SYS - 224
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