Passat Syncro Wagon V6-2.8L (ATQ) (2000)
ECM, Adapting to Throttle Valve Control Module
The adaptation teaches the Engine Control Module (ECM) various positions of the throttle valve when the ignition is on and the engine is stopped. These
positions are stored in the control module Throttle valve position feedback takes place through the two throttle valve drive angle sensors.
The adaptation must be performed if:
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the supply voltage has been interrupted
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the throttle valve control module has been removed and reinstalled
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the throttle valve control module has been replaced
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another engine has been installed, and another throttle valve control module along with it
Special tools and equipment
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VAG 1551 Scan Tool (or VAG 1552 mobile scan tool) with VAG 1551/3 cable
Test condition
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There must not be any DTCs stored in DTC memory See Check DTC memory.
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Battery voltage must be at least 11.5 volts.
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Throttle valve must be in Closed Throttle Position (CTP)
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Coolant temperature must be 5 - 95 °C, See Display group 04, display field 3
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If a cruise control system is present, it must be properly adjusted.
Procedure
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Connect VAG 1551 scan tool (VAG 1552). Then switch ignition on and select the Engine Control Module (ECM) using address word 01
(connecting scan tool and selecting ECM). See: Powertrain Management/Computers and Control Systems/Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -4- to select "Basic Setting" function 04. Press -Q- button to confirm input.
Indicated on display
Basic Setting
HELP
Input display group number XXX
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Press buttons -0-, -6- and -0- to select "Display group number 60". Press -Q- button to confirm input.
Indicated on display (1 - 4 = display fields)
Basic Setting 60
->
XXX% XXX% X
ADP. runs
After pressing Q-button, throttle valve actuator will be switched on without current. In this condition, the throttle valve will be drawn into an emergency
position by a mechanical spring, which is located in the throttle valve control module. The values supplied by the two angle sensors in this emergency
position are stored by the Engine Control Module (ECM).
Next, the throttle valve is opened by a certain value. If this value is reached, the throttle valve actuator is once again de-energized. Now, the mechanical
spring must close the throttle valve to the previously learned emergency position within a specified time (spring test).
Then, the throttle valve is closed by the throttle valve actuator; the values supplied by the angle sensors in the throttle valve control module are stored by
the Engine Control Module (ECM).