Electronic Throttle Control Indicator: Testing and Inspection
Electronic Power Control (EPC) Warning Lamp in instrument cluster,
checking
Installation location of EPC warning lamp
Significance of EPC warning lamp
"EPC" is an abbreviation and stands for Electronic Power Control and means "electronic engine load control" (EPC).
If malfunctions are recognized in the E-gas system during operation of the engine, the Engine Control Module (ECM) switches on the EPC warning lamp. (These malfunctions are listed in the DTC table). An entry is made in DTC memory at the same time.
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
Requirement
The respective fuses of Electronic Power Control (EPC) Warning Lamp -K132- must be OK.
Test sequence
- Switch on ignition:
Warning lamp must light up.
If warning lamp does not light up when ignition is switched on:
- Switch ignition off.
- Remove instrument cluster:
- Check wiring connection from Engine Control Module (ECM) to Electronic Power Control (EPC) Warning Lamp -K132- according to wiring diagram.
- Erase DTC memory of Engine Control Module (ECM). Testing and Inspection
- Generate readiness code. Testing and Inspection
If no malfunctions are detected in wire from Engine Control Module (ECM) to warning lamp:
- Replace Motronic Engine Control Module (ECM) -J220-
If warning lamp lights up when ignition is switched on:
- Start engine and let run at idle:
Warning lamp must go out after a few seconds.
If the warning lamp does not go out:
- Switch ignition off.
- Remove instrument cluster.
- Check wire connection between Engine Control Module (ECM) and instrument cluster for short circuit to Ground (GND) according to wiring diagram.
- Erase DTC memory of Engine Control Module (ECM). Testing and Inspection
- Generate readiness code. Testing and Inspection
If no malfunctions are detected in wire from Engine Control Module (ECM) to warning lamp:
- Replace Motronic Engine Control Module (ECM) -J220-.