Exhaust Gas Recirculation: Testing and Inspection
Potentiometer For EGR -G212-, Checking (Vehicles With Engine Code BEW)
NOTE: Use only gold-plated terminals when servicing terminals in harness connector.
Recommended special tools and equipment
- VA.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram
Requirements
- 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 position -P- or -N-
- Ground (GND) connections between engine and chassis must be OK.
- EGR Vacuum Regulator Solenoid Valve -N18- with Potentiometer for EGR -G212- must be OK mechanically and clean, check. removing and installing EGR system components.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ignition is switched off.
Checking voltage supply
- Disconnect 6-pin connector (arrow) from EGR Vacuum Regulator Solenoid Valve -N18- with Potentiometer for EGR G212-.
- Switch ignition on.
- Measure voltage supply between connector terminals 1+3:
Specified value: approx. 5.0 V
- Switch ignition off.
If specified value is not obtained:
- Check wires to Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- according to wiring diagram.
If specified value is obtained:
- 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 for open circuit in wires between test box and 6-pin connector according to wiring diagram.
Terminal 5 + socket 24
Wire resistance: max. 1.5 Ohms
- Check wire for short circuit to vehicle Ground (GND) and to B+.
Specified value: Infinite Ohms
If no malfunctions are found in wire:
- Replace EGR Vacuum Regulator Solenoid Valve -N18- with Potentiometer for EGR -G212-.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Perform a basic setting of EGR Vacuum Regulator Solenoid Valve -N18- with Potentiometer for EGR -G212-.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
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.
- Check for open circuit in wires between test box and 6-pin connector according to wiring diagram.
Terminal 1 + socket 26
Terminal 3 + socket 23
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 malfunctions are found in wires:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-.