Electronic Throttle Control Module Testing - Passat Syncro V6 Wagon (2000)
Electronic Throttle Control Module: Testing and Inspection
With Manufacturer's Scan Tool
Throttle valve control module, checking
The engine identification ATQ indicates electronic gas activation.
This means that the throttle valve is activated by an electric motor in the throttle valve control module. This is activated by the Engine Control Module
(ECM) based on the information from the Throttle Position (TP) sensor -G79- and sensor 2 for accelerator pedal position -G185-.
Components of throttle valve control module -J338-: Throttle valve drive -G186-, angle sensor 1 for throttle valve drive -G187-, and angle sensor 2 for
throttle valve drive -G188-.
NOTE:
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If throttle valve control module is replaced, it must be adapted to the new control module to Engine Control Module (ECM).
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In vehicles with automatic transmissions the transmission control module must also be adapted.
Special tools and equipment
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V.A.G 1551 (or VAG 1552 mobile scan tool) with VAG 1551/3 cable
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VAG 1598/31 test box
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VAG 1526 multimeter or VAG 1715 multimeter
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VAG 1594 connector test kit
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Wiring diagram
Test condition
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Throttle valve must not be damaged or dirty.
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Coolant temperature must be at least 80°C, See Display group 04, display field 3
Test sequence
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Connect V.A.G 1551 scan tool (VAG 1552). Switch ignition on and select Engine Control Module (ECM) using address word 01. See: Testing
and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551
Scan Tool
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XXX
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Press buttons -0-, -6- and -2- to select "Display group number 62". Press -Q- button to confirm input.
Indicated on display (1 - 4 = display fields)
Read Measuring Value Block 62
->
1
2
3
4
-
Check throttle angle of sensor 1 -G187- at idle stop in display field 1
Specification: 3 - 93%
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Check throttle angle of sensor 2 -G188- at idle stop in display field 2
Specification: 97 - 3%
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Press accelerator pedal slowly until it reaches Wide Open Throttle (WOT) position, and observe angle display in display fields 1 and 2:
Percent indication in display field 1 must climb uniformly. In the process, the tolerance range of 3-93% is not completely utilized.
Percent indication in display field 2 must decrease uniformly. The tolerance range 97-3 % is not used completely during this.