Checking activation
- Connect multimeter as follows to measure voltage.
| Relay carrier in electronics box, plenum chamber, position 2 Terminal | Measure to |
|---|---|
| 6 | Battery positive (B+) |
- Switch ignition on.
- Specified value: approx. battery voltage (B+)
If specified value is not obtained
- Switch ignition off.
- Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect ECM. Refer to «Electrical testing using VAG1598/31 test box»(/audi/a4/b7-2004-2009/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb__electrical-testing-using-vag159831-test-box) .
- Check for open circuit, short to positive, or short to ground in following wiring connection(s)
| Relay carrier in electronics box, plenum chamber, position 2 Terminal | Test box V.A.G 1598/31 Socket |
|---|---|
| 6 | 21 |
- Repair any open/short circuit as necessary.
If no malfunction is found
- Replace Motronic ECM power supply relay -J271-.