New Beetle Convertible L5-2.5L (BPR) (2007)
Electronic Throttle Control Module: Testing and Inspection
Diagnostic Procedures
Throttle Valve Control Module, Checking
‹› Use only gold-plated terminals when servicing terminals in harness connector of Throttle Valve Control Module (J338).
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Motronic Engine Control Module (ECM) ( J220 ) fuses OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground connections between engine/transmission/chassis OK.
‹› Throttle valve must not be damaged or dirty.
‹› Coolant Temperature at least 80° C.
Function
Throttle valve operation occurs by an electric motor (Throttle Drive (for Electronic Power Control (EPC)) (G186)) in the Throttle Valve Control
Module ( J338). It is operated by the Motronic Engine Control Module (ECM) (J220) based on input from the Throttle Position (TP) Sensor
(G79)/Accelerator Pedal Position Sensor 2 ( G185).
The Throttle Valve Control Module (J338) is made up of the following components:
‹› Throttle Drive (for Electronic Power Control (EPC)) (G186)
‹› Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) (G187)
‹› Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) (G188)
The Throttle Valve Control Module (J338) cannot be serviced separately and must be serviced as a unit.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check
Start diagnosis
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Connect the scan tool.
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Switch ignition ON.
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Using the scan tool, check the throttle valve position (absolute) at idle stop: