Glow Plug System, Checking - II

IF no voltage is present: Refer to Electrical Wiring Diagrams.

Glow Plug System, Checking

CAUTION: The ceramic glow plugs are very sensitive to impacts and bending. For this reason, any glow plugs that have been dropped (even from a short distance of approx. 2 cm) must not be used under any circumstances, even if there appears to be no external damage. The installation instructions must be followed exactly, otherwise there is a dangerous risk that the plug may break and thereby cause engine damage.

Special tools, testers and auxiliary items required







- Multimeter V.A.G 1526 A







- Adapter set V.A.G 1594 A

Requirements
- Glow plug strip fuse in battery fuse holder OK.
- Battery voltage must be at least 11.5 V.
- All electrical consumers, e.g. lights and rear window defogger, must be switched off.
- Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- OK.

Work sequence
- Disconnect connector on Engine Coolant Temperature (ECT) sensor -G62-.

NOTE: Disconnecting the sensor simulates the engine condition "cold" and when switching the ignition on the relevant glow period is initiated.

- Disconnect glow plug connector.
- Connect multimeter to measure voltage between a glow plug connector and vehicle ground.
- Switch on ignition for approx. 20 seconds. Approx. battery voltage must be displayed.
- If no voltage is present: Refer to Electrical Wiring Diagrams.