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HOMESERVICE MANUALSVOLKSWAGEN2002GOLF GLS, 2.0 K, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 99 (2.0L - GENERIC SCAN TOOL, ENGINE CODE(S): AEG (A4 PLATFORM))20 - FUEL SUPPLYELECTRONIC ENGINE POWER CONTROL (EPC)FUNCTION OF "EPC" SYSTEM
2002 Volkswagen Golf GLS, 2.0 K, Standard

Function of "EPC" system

2002 Volkswagen Golf GLS, 2.0 K, StandardSECTION Function of "EPC" system
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2001 Volkswagen Jetta, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, 2000 Volkswagen GTI, and 1999 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

For "EPC" , the throttle valve is not operated by a cable from the accelerator pedal. There is no mechanical connection between the accelerator pedal and the throttle valve.

The position of the accelerator pedal is communicated to Motronic Engine Control Module (ECM) J220 via Throttle Position (TP) Sensor G69 / Throttle Position (TP) Sensor G88 (variable resistances; stored in one housing) that are connected with the accelerator pedal.

The accelerator pedal position (drivers intention) is a main input unit for the Motronic Engine Control Module (ECM) J220.

Operation of the throttle valve occurs via an electric motor ( Throttle Position (TP) Actuator V60 ) in the Throttle Valve Control Module J338. This is true across the entire engine speed and engine load spectrum.

Throttle valve is operated by Throttle Drive (for Electronic Power Control (EPC)) G186 according to specifications of Motronic Engine Control Module (ECM) J220.

With engine off and ignition switched on, Motronic Engine Control Module (ECM) J220 controls the Throttle Position (TP) Actuator V60 exactly according to specifications of Throttle Position (TP) Sensor G69 / Throttle Position (TP) Sensor G88. This means, if the accelerator pedal is depressed half way, the Throttle Position (TP) Sensor G88 opens the throttle valve to the same degree; i.e. throttle valve is then opened approx. half way.

With engine running (under load), Motronic Engine Control Module (ECM) J220 can open or close the throttle valve independently of Throttle Position (TP) Sensor G69 / Throttle Position (TP) Sensor G88.

This means, for example, that the throttle valve could be fully opened even though the accelerator pedal has only been depressed half way. This has the advantage of preventing torque losses at the throttle valve.

In addition to this, it results in significantly better values relative to emissions and consumption under certain load conditions.

It would be incorrect to think that "EPC" consists of only one or two components. "EPC" is much more of a system containing all components that contribute to recognizing, controlling and monitoring the position of the throttle valve.

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