A3 L4-2.0L Turbo (CBFA) (2008)
Electronic Throttle Control Module: Component Tests and General Diagnostics
Throttle Valve Control Module, Checking
Observe all safety precautions.
View clean working conditions.
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
Special tools, testers and auxiliary items required
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multimeter.
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Wiring diagram.
Test requirements
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The Motronic Engine Control Module (ECM) J623 fuses OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, shift selector lever into position "P" or "N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Throttle valve must not be damaged or dirty.
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Coolant Temperature at least 80 degrees 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) J623 and 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:
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Throttle Drive (for Electronic Power Control (EPC)) G186
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Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G187
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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. 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:
Diagnostic text
Specified value
Throttle valve position (absolute)
Idle stop
3.0 to 25.0%