Electronic Power Control (EPC), Checking

Check Electronic Power Control (EPC) Warning Lamp In Instrument Cluster

Installation location of EPC warning lamp

Version A







Version B







Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test 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.
- Check wire from Engine Control Module (ECM) to MIL as follows.
- Connect test box to control module wiring harness, connect test box for wiring test.
Test Box, Connecting For Wiring Test

- Bridge sockets 1 + 48 of test box with the respective adapter cables.
- Switch on ignition:
Warning lamp must light up.

If warning lamp does not light up:
- 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), Diagnostic mode 4: Reset/erase diagnostic data.
Clearing Diagnostic Trouble Codes

- Generate readiness code.
Monitors, Trips, Drive Cycles and Readiness Codes

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.

- Connect test box to control module wiring harness, connect test box for wiring test.
Test Box, Connecting For Wiring Test
- Check wire connection between test box socket 48 and instrument cluster for short circuit to Ground (GND) according to wiring diagram.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
Clearing Diagnostic Trouble Codes

- Generate readiness code.
Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunctions are detected in wire from Engine Control Module (ECM) to warning lamp:
- Replace Motronic Engine Control Module (ECM) -J220-.