Jetta GLS Wagon L4-2.0L (AZG) (2002)
Electronic Throttle Control Module: Testing and Inspection
Throttle Valve Control Module J338, Checking
With Generic Scan Tool
Throttle Valve Control Module, Checking
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of throttle valve control module.
Vehicles with engine code AVH, AZG (121-pin Engine Control Module -ECM-)
Function
The throttle valve activation occurs via an electric motor (throttle drive) in the throttle valve control module. It is activated by the Engine Control
Module (ECM) according to specifications of the two sensors, Throttle Position (TP) Sensor -G79- and Sensor 2 for accelerator pedal position -G185-,
function of the E-gas system.
Components of throttle valve control module -J338-:
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Throttle drive (power accelerator actuation) -G186-
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Angle sensor -1- for throttle drive (power accelerator actuation) -G187-
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Angle sensor -2- for throttle drive (power accelerator actuation) -G188-
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test requirements
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The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK:
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Battery voltage must be at least 11.5 volts.
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All electrical consumers like, for example, lights and rear window heating must be switched off.
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Parking brake must be engaged or else daylight driving lights will be switched on.
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If vehicle is equipped with an A/C system, it must be switched off.
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Ground (GND) connections between engine and chassis must be OK.
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Throttle valve must not be damaged or dirty.
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Coolant temperature must be at least 80 degree C, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature. See: Testing and
Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 1: Check Measured Values
Function test
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Connect diagnostic tester. See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan
Tool/Diagnostic Tester, Connecting
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Switch ignition on.
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Under address word 33, select "Diagnostic mode 1: Checking measured 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: