A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
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Disconnect the electrical harness connector - 2 - from the Throttle Valve Control Module J338 .
Checking resistance
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Using the Multimeter V.A.G. 1526 A or equivalent, check the resistance of Throttle Drive (for Electronic Power Control (EPC)) G186 at Throttle
Valve Control Module J338 between terminals 3+5.
Specified resistance 1.5 Ohms max.
If the specification is not obtained:
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Replace Throttle Valve Control Module J338.
If the specification is obtained:
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Check voltage supply of the Throttle Valve Control Module J338 to the Engine Control Module (ECM) J623.
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Check Throttle Position (TP) Sensor G79 / Accelerator Pedal Position Sensor 2 G185. See: Powertrain Management/Computers and Control
Systems/Sensors and Switches - Computers and Control Systems/Throttle Position Sensor/Testing and Inspection
Checking voltage supply and wiring
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Switch ignition on.
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Using the Multimeter V.A.G. 1526 A or equivalent, check the voltage of Throttle Drive (for Electronic Power Control (EPC)) G186 at Throttle
Valve Control Module J338 between terminals 2+6.
Specified value: at least 4.5 V
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Switch ignition off.
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Connect the Test Box 105 Pin VAG1598/42 to the wiring harness of the Engine Control Module (ECM) J623.