Electronic Power Control (EPC) Warning Lamp, Checking
Electronic Power Control (EPC) Warning Lamp In Instrument Cluster, Checking
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. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Readiness Code, Generating
If no faults 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 sockets 60 and 58 to instrument cluster for open circuit, short circuit to Ground (GND) and to B+ according to wiring diagram:
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Readiness Code, Generating
If no faults are detected in wire from Engine Control Module (ECM) to warning lamp:
- Replace Motronic Engine Control Module (ECM) -J220-.