Checking output wiring
- Connect voltage tester V.A.G 1527 B as follows:
| Harness connector Terminal | Measure to |
|---|---|
| - 2 - | Battery positive (B+) |
- Initiate output Diagnostic Test Mode (DTM) Check activation .
Fig 1: Display On VAS 5051 - (1st Control Element In Test & Evaporative Emission (EVAP) Canister Purge Regulator Valve-N80-)
Display on VAS 5051 :
A - Output diagnostic test mode waiting, Advancing by switching required
1 - Evaporative Emission (EVAP) Canister Purge Regulator Valve N80
- Press → button repeatedly until leak detection pump for fuel system is activated
- LED must blink.
If LED does not blink:
- End function "03 - output Diagnostic Test Mode (DTM)" by pressing ← button.
- From selection, click on diagnostic function "06 - End output".
- Switch off ignition.
Fig 2: Connecting Test Box V.A.G 1598/42 To Wiring Harness With Adapter Cable V.A.G 1598/39-1 Or Adapter Cable V.A.G 1598/39-2
- Connect test box V.A.G 1598/42 to wiring harness with adapter cable V.A.G 1598/39-1 or adapter cable V.A.G 1598/39-2. Clamp test box Ground (GND) clip to battery negative terminal. The procedure will indicate whether the engine control module is to be connected to the test box or not.
CAUTION:
To avoid damaging electronic components, switch to the corresponding measuring range and observe all test conditions before connecting the test leads.
- Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:
| Harness connector Terminal | V.A.G 1598/42 Bushing |
|---|---|
| - 2 - | 4-Cyl. TFSI: B 8 |
| 6-Cyl. FSI: B 24 | |
| 8-cyl. FSI - Audi RS4: A 55 |
- Repair wiring open circuit or short circuit according to wiring diagram.
If no malfunction is found, but leak diagnosis pump is not functional during output diagnostic test mode:
- Replace Leak Detection Pump (LDP) V144 → Leak Detection Pump (LDP) V144 , removing and installing .
- Observe procedures for after re-connecting engine control module (ECM) →
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