Checking exhaust gas recirculation valve N18 voltage supply — VW

🧭 Before you start

Pull the connector off the valve and measure between contact 1 and engine ground with the ignition on; the specification is approximately battery voltage. Switch the ignition off, connect the 68-pin adapter cable to the control unit harness and check contact 1 to socket 68 and contact 2 to socket 25 for open circuit per the current flow diagram. Connect the other adapter and check contact 1 to sockets 2 and 28 and contact 2 to socket 29. Check all lines for shorts to each other, to earth and to battery positive; if everything is in order, renew control unit J248.

Fits: platform code 6N1

• Special tools named: V.A.G 1598/18A

Don't miss

• Specification at contact 1 with ignition on: approximately battery voltage.
• Ignition off before connecting the adapter cable to the control unit harness.
• Open-circuit checks: contact 1 to socket 68, contact 2 to socket 25; then sockets 2 and 28, and 29.
• Check for shorts between lines, to earth and to battery positive, not just open circuits.
• Control unit J248 is renewed only after every wiring check passes.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📐 18 workshop diagrams for AGD

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Pull connector from valve .
2. Connect hand-held multimeterV.A.G 1526C to connector contact 1 and engine ground using auxiliary lines from auxiliary measuring setV.A.G 1594C.
3. Switch on ignition.
4. Specification: approx. battery voltage
5. Switch off ignition.

6. Connect adapter cable, 68-pinV.A.G 1598/18A to control unit wiring harness.
7. Check lines between adapter cable (68-pin)V.A.G 1598/18A and connector for open circuit according to current flow diagram. Contact 1 + socket 68 Contact 2 + socket 25.
8. Connect adapterV.A.G 1598/22 to control unit wiring harness.
9. Check lines between adapterV.A.G 1598/22 and connector for open circuit according to current flow diagram. Contact 1+sockets 2+28 Contact 2+socket 29.
10. Also check wiring for short to one another, short to vehicle earth and short to battery positive.
11. Renew diesel direct injection system control unit J248.

Other VW procedures

• Checking coolant temperature sender G62
• Checking signal from brake light switchF and brake pedal switch F47.
• Checking injection timing control range
• Checking fuel temperature sender G81
• Checking clutch pedal switch F36
• Removing engine · 41 torque figures
• Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
• Adjusting valve timing – VW Passat B5 · 83 torque figures
• Removing and installing camshafts – VW Passat B6 · 39 torque figures
• Removing and installing coolant pump · 53 torque figures