Volkswagen Workshop Service and Repair Manuals > Polo Mk3 > Power unit | 3-cylinder diesel engine | Ignition system, glow plug system | Glow plug system

Checking glow plugs

Special tools and workshop equipment required

t	Voltage tester -V.A.G 1527B-

t	Auxiliary measuring set -V.A.G 1594C-

t	U/J extension and socket, 10 mm -3220-

Test prerequisites:

l	Battery voltage at least 11.5 V

l	Ignition switched off

Test procedure

–	Pull glow plug connectors off glow plugs.

–	Connect voltage tester -V.A.G 1527B- cable to battery positive (+), using clips from auxiliary measuring set -V.A.G 1594C-.

–	Place test probe of voltage tester -V.A.G 1527B- on each glow plug one after the other.

Diode lights up: Glow plug OK.

If diode does not light up: fit a new glow plug

–	Remove and install glow plugs with U/J extension and socket, 10 mm -3220-.

Torque setting: 15 Nm.

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