EGR Electronic Vacuum Regulator Solenoid: Testing and Inspection

EGR Vacuum Regulator solenoid valve, checking





- Disconnect 2-pin electrical connector from EGR valve (arrow).

Resistance, measuring





- Measure resistance between contact terminals of -N18- EGR Vacuum Regulator Solenoid Valve.
^ Specification: 14.0 to 20.0

Note: At room temperature resistance is in the lower tolerance range. At operating temperature resistance is in the upper tolerance range.

If specification not obtained:
- Replace EGR Vacuum Regulator solenoid valve -N18-.
- Check DTC memory.
- Read readiness code.
If the DTC memory was erased or the engine control module is subject to low voltage with the ignition ON, reset the readiness code again.
If the specification was obtained:
- Check voltage supply of EGR valve

Voltage supply, checking





- Connect multimeter using jumper wire from VAG test kit between terminal 1 and engine Ground (GND).
- Switch ignition ON.
^ Specification: at least 11.5 V
If the specification was not obtained:
- Switch ignition off.
- Remove windshield wiper arms and plenum cover.





- Connect VAG 1598/22 Test Box to harness connector of control module.





- Check wiring for short circuit between Test Box sockets.
^ Resistance: 1.5 Ohm maximum
- Check wires for short circuit one against another, to vehicle ground and to battery B+.
^ Wiring resistance: x
If no malfunction and if voltage between terminal 1 and ground:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module -J248-.
- Check DTC memory.
- Read readiness code.
If the DTC memory was erased or the constant voltage supply to the engine control module was interrupted, the readiness code must be initiated again.