Turbocharger: Testing and Inspection

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...20 Ohm

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.







- Measure voltage supply of valve at connector terminal 1 and at engine Ground (GND).
Specified value: approx. battery voltage
- 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 Ohm

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

Continuation for all vehicles
- Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: Infinite Ohm

If no malfunctions are found in wires:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-.
- 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