Part II

Checking EGR Vacuum Regulator Solenoid Valve

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements






- The respective fuses of Diesel-Direct fuel injection system must be OK:
- Battery voltage must be at least 11.5 Volts.
- No leaks on intake or exhaust side.
- Vacuum hoses must be properly sealed.






- Disconnect connector at solenoid valve for Exhaust Gas Recirculation (EGR).






- Measure resistance between terminals of valve.
- Measure resistance at valve.
Specified value: 14...20 Ohm

NOTE: Resistance at room temperature is in lower specified range, resistance at operating temperature is in upper specified range.

If specified value is not obtained:
- Replace EGR Vacuum Regulator Solenoid Valve -N18-.
- 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 harness connector according to wiring diagram.
Terminal 1 + socket 2+28
Terminal 2 + socket 29
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 1 + socket 1 and 2
Terminal 2 + socket 61
Wire resistance: max. 1.5 Ohm

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-.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes