Wastegate Bypass Regulator Valve -N75- Checking

Wastegate Bypass Regulator Valve N75, Checking

Special tools, testers and auxiliary items required
- Multimeter V.A.G 1526 or equivalent.
- Test Box 105 Pin VAG1598/42.
- Adapter Lead Vag1598/39 VAG1598/39.
- Adapter cable V.A.G 1598/39-1.

Test requirements
- Fuses for the Engine Control Module (ECM) J623 OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- On vehicles with automatic transmission, selector lever in position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.

Test sequence







- Remove engine cover - arrows -.







- Disconnect electrical harness connector - 2 - at Wastegate Bypass Regulator Valve N75.







- Using the Multimeter V.A.G 1526 A or equivalent, check the Wastegate Bypass Regulator Valve N75 for resistance.
Specified value: 20 to 25 Ohms (at approx. 20 degrees C).

If the specification is not obtained:
- Replace Wastegate Bypass Regulator Valve N75.

If the specification is obtained:

Checking Resistance
- Connect the test box 1598/42 to the wiring harness of the Engine Control Module (ECM) J623.







- Using the Test Box 105 Pin VAG1598/42 and Multimeter V.A.G 1526 A or equivalent, check the following wiring connection for an open circuit.

Terminal Test box socket
2 4

Specified value: Wire resistance max 1.5 Ohms.

If the specified value is not obtained.
- Repair the wiring connection.

If the specified value is obtained.
- Check the wiring between the electrical connector terminal 1 and Engine Component Power Supply Relay J757 terminal 2 for an open circuit.
Specified value: Wire resistance max 1.5 Ohms.

If the specified value is not obtained.
- Repair the wiring connection.

If the specified value is obtained.
- Replace the Engine Control Module (ECM) J623.

Assembly is performed in the reverse order of the removal, note the following:

Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

- End diagnosis and switch the ignition off.