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RSV4 Factory a-PRC
connector and if there is voltage, restore cable harness; if there is not voltage, replace in-
strument panel, if there is not voltage, replace motor.
•
If shorted to negative, the circuit is open: check the valve connector and instrument panel
connector: if not OK, restore; if OK, check continuity on the brown/black cable: if not OK,
restore; if OK, always with two connectors disconnected, check ground insulation: if there
is ground continuity, disconnect also the instrument panel and if it is still present, restore the
cable harness; if there is not ground continuity, replace the instrument panel; if there is not
ground continuity, replace the motor.
DIAGNOSIS INSTRUMENT: LOGIC ERRORS
Exhaust valve position P0190
•
position error.
Error cause
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Position indicated by potentiometer does not correspond with position set by control unit.
Troubleshooting
•
Mechanically check the valve, its normal rotation (with cables disconnected from motor,
manually activate the cables and see movement regularity and check valve complete stroke
with correct operation of the return spring) and absence of foreign bodies which do not allow
its rotation: if not OK, restore; if OK, check valve and instrument panel connectors (special
attention to oxidation) and check cables resistance: if not OK, restore; if OK, always with
cables disconnected and key set to ON, check normal rotation of the electric motor and
replace motor (potentiometer does not work correctly).
DIAGNOSIS INSTRUMENT: ADJUSTABLE PARAMETERS
•
Acquire exhaust valve zero position.
NOTE: Motor is placed in a reference position to correctly search mechanical stop later.
•
Exhaust valve self-acquisition
NOTE: Search minimum and maximum mechanical stop.
The system consists of a throttle valve (1) with a return spring placed in the exhaust pipe. The valve is
closed via two cables actuated by an electric motor (2) which, in turn, is connected electrically to the
instrument panel. The operating logic and motor control are, however, resident in the Marelli injection
control unit, which dialogues with the instrument panel via the CAN.
The motor unit (2) consists of a potentiometer for position detection and a DC electric motor (2).
At key-ON, a valve (1) self-cleaning cycle is performed.
In the event of malfunction (electric or mechanical), the valve (1) may remain stuck in the closed position.
In the event of a CAN line malfunction, the valve (1) is returned to the open position.
In the event of removal or replacement of one or more system components (cables, valve or motor), a
calibration procedure is required.
Electrical system
ELE SYS - 227
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