TT Coupe L4-1.8L Turbo (AWP) (2005)
Electronic Throttle Control Module: Component Tests and General Diagnostics
Throttle Valve Control Module, Checking
Throttle Valve Control Module, Checking
NOTE:
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Use only gold-plated terminals when servicing terminals in harness connector of throttle valve control module.
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The throttle valve activation occurs via an electric motor (throttle drive) in the throttle valve control module. This is activated by ECM according
to specifications of Throttle Position (TP) Sensor -G79- and Accelerator Pedal Position Sensor 2 -G185-.
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Throttle Valve Control Module -J338- 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-
Recommended Special Tools, Workshop Equipment, Testers, Measuring Instruments and Auxiliary Items
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V.A.G 1526 portable multimeter or V.A.G 1715 multimeter.
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Adapter set V. A. G 1594
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Wiring diagram
Test Conditions
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The corresponding fuses of Motronic Engine Control Module (ECM) -J220- must be OK
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Battery voltage must be at least 11.5 V.
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All electrical consumers such as, for example, lights and rear window defroster must be switched off.
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The parking brake must be applied, otherwise the daytime running lights are switched on.
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If the vehicle is equipped with an air conditioning system, this must be switched off.
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The Ground (GND) connections between engine and body must be OK.
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Throttle valve not damaged or contaminated
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Coolant temperature must be at least 80 degrees C, See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan
Tool Testing and Procedures/Diagnostic Mode 01 - Read Current System Data Diagnostic mode 1: Check measured values; PID 5, Coolant
temperature.
Function Test
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Connect diagnostic tester. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Tester, Connecting
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Switch ignition on.
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Under address word 33, select "Diagnostic mode 1: Checking measuring values."
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Select the measuring value "PID 17: Throttle valve position (absolute)."
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Check specified value of throttle valve position (absolute) at idle stop:
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Slowly depress accelerator pedal up to Wide Open Throttle (WOT) stop while observing the percentage display.
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The percentage display must increase uniformly.
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Check specified value of throttle valve position (absolute) at Wide Open Throttle (WOT) stop:
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End diagnosis and switch ignition off.
If the specifications are not obtained:
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Connect test box to ECM wiring harness. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/Test Box, Connecting For Wiring Test
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The Engine Control Module (ECM) remains disconnected.
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Measure resistance from throttle valve actuator between test box sockets 117 + 118
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specified value: 1 to 5 Ohms
If the specification is not obtained:
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Replace Throttle Valve Control Module -J338-.
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Erase DTC memory of ECM. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and