GTI V6-2.8L (AFP) (1999)
Throttle Body: Testing and Inspection
Components of the throttle valve control module -J338-:
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Throttle drive (power accelerator actuation) -G186-
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Angle sensor -1- for for throttle drive (power accelerator actuation) -G187-
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Angle sensor -2- for for throttle drive (power accelerator actuation) -G188-
NOTES:
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If the throttle valve control module is replaced, the new control module must be matched to the Engine Control Module (ECM). See: Computers
and Control Systems/Engine Control Module/Testing and Inspection
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On vehicles with an automatic transmission, the Transmission Control Module (TCM) must also be adapted.
Special tools and equipment
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VAG1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
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VAG1598/31 test box
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Multimeter (Fluke 83 or equivalent)
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VW1594 adapter set
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Wiring diagram
Test conditions
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Throttle valve not damaged or dirty.
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Automatic transmission selector lever in "P" or "N" position (if equipped)
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Coolant temperature at least 85 °C See display group 04, display field 3.
NOTE: Only gold plated contacts can be used to repair the contacts in the connector for the throttle valve control module.
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Connect VAG1551 (VAG1552) Scan Tool (ST). See: Computers and Control Systems/Testing and Inspection
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Switch ignition on and press buttons -0- and -1- to insert "Engine Electronics" address word 01.
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
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Press buttons -0-, -6- and -2- to input display group number 62 (062) and press -Q- button to confirm input.
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Check angle sensor -1- for for throttle drive (power accelerator actuation) -G187- on idle speed stop in display field 1.
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Check angle sensor -2- for for throttle drive (power accelerator actuation) -G188- on idle speed stop in display field 2.
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Depress accelerator slowly until Wide Open Throttle (WOT) position and observe angles displayed in display fields 1 and 2.
The percentage displayed in display field 1 must rise continuously and evenly. The full tolerance range (3-93%) is not always displayed.
The percentage displayed in display field 2 must fall continuously and evenly. The full tolerance range (97-3%) is not always displayed.