Wastegate Bypass Regulator Valve, Checking

Wastegate Bypass Regulator Valve, Checking

Recommended special tools and equipment e.g.:

- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit

Test sequence
- Switch ignition off.







- Disconnect connector (arrow) from wastegate bypass regulator valve.







- Measure resistance between terminals of valve.

Specified value: 14 to 20 Ohms

If specified value is not obtained:
- Replace Wastegate Bypass Regulator Valve -N75-.
- Erase DTC memory of control module for Diesel-Direct fuel injection system, Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specified value is obtained:
- Switch ignition on.

Vehicles with 80-pin control module







- Measure voltage supply of valve at connector terminal 1 and at engine Ground (GND).

Specified value: approx. battery voltage

Vehicles with 121-pin / 154-pin control module







- Measure voltage supply of valve at connector terminal 1 and at engine Ground (GND).

Specified value: approx. battery voltage

Continue for all vehicles
- Switch ignition off.

If specified value is not obtained:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test

Vehicles with 80-pin control module







- Check for open circuits in wires between test box and connector according to wiring diagram.

Terminal 1 + socket 2 and 28
Terminal 2 + socket 15

Wire resistance: max. 1.5 Ohms

Vehicles with 121-pin control module







- Check for open circuits in wires between test box and connector according to wiring diagram.

Terminal 2 + socket 62

Wire resistance: max. 1.5 Ohms

- Check the wire to terminal 1 according to wiring diagram.

Vehicles with 154-pin control module
- Connect adapter cable (V.A.G 1598/39-1) to test box (V.A.G 1598/42).







- Check for open circuits in wires between test box and connector according to wiring diagram.

Terminal 2 + socket 29

Wire resistance: max. 1.5 Ohms
- Check the wire to terminal 1 according to wiring diagram.

Continue for all vehicles
- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.

Specified value: Infinite Ohms

If no malfunctions are found in wires:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes