Electronic Throttle Control Indicator: Testing and Inspection

Electronic Power Control (EPC) Warning Lamp in instrument cluster,
checking

Significance of EPC warning lamp
"EPC" is an abbreviation and stands for Electronic Power Control and means "electronic engine load control".

If malfunctions are recognized in the EPC system during operation of the engine, the Engine Control Module (ECM) switches on the EPC warning lamp.




Installation location of EPC warning lamp

Recommended special tools and equipment
V.A.G 1526 multimeter or V.A.G 1715 multimeter
V.A.G 1594 connector test kit
Wiring diagram

Test requirement




The respective fuses of instrument cluster must be OK:

Test sequence

- Switch on ignition

EPC warning lamp must light up.
If EPC warning lamp does not light up when ignition is switched on:

- Switch ignition off.
- Remove instrument cluster
- Check wire connection of databus to instrument cluster according to wiring diagram:
- Erase DTC memory of Engine Control Module (ECM). Clearing Diagnostic Trouble Codes
- Generate readiness code. Testing and Inspection

If no malfunction is detected in wire connection to instrument cluster:
- Replace instrument cluster

If EPC warning lamp lights up when ignition is switched on:

- Start engine and let run at idle

The EPC warning lamp must go out after a few seconds.
If EPC warning lamp does not go out:

- Check DTC memory of Engine Control Module (ECM).Testing and Inspection
- Repair existing malfunctions and erase DTC memory of Engine Control Module (ECM).Testing and Inspection
- Generate readiness code. Testing and Inspection