Wastegate Bypass Regulator Valve, Checking

Wastegate Bypass Regulator Valve, Checking

Recommended special tools and equipment e.g.:
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

Requirement







- The respective fuses of Diesel-Direct fuel injection system must be OK.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers such as, lights and rear window defroster must be switched off.
- For vehicles with automatic transmission, selector lever must be in -P-.
- Parking brake must be engaged.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition is switched off.

Test sequence







- Disconnect 2-pin connector (arrow) from Wastegate Bypass Regulator Valve -N75-.
- 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 Engine Control Module (ECM), 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:
- Check voltage supply of valve.

Checking voltage supply
- 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:
- Check wire from 2-pin connector terminal 1 to Power Supply (Terminal 30, B+) Relay -J317- according to wiring harness:

If specified value is obtained:
- Check wires to Engine Control Module (ECM) according to wiring diagram.

Check wires to control module
- Connect test box (1598/42) to Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- wiring harness using adapter cable (V.A.G 1598/39-1), connecting test box for wiring test. Test Box, Connecting For Wiring Test







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

Terminal 2 + socket 29

Wire resistance: max. 1.5 Ohms

- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: Infinite Ohms

If no malfunction is detected in the wire and voltage supply is OK:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-.