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Checking glow plug system
Checking glow plugs
Special tools, testers and auxiliary items
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◆ Diode test lamp V.A.G 1527
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◆ Adapter set V.A.G 1594
Test sequence
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‒ Remove wiring and busbar for glow plugs.
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‒ Connect diode test lamp wire using auxiliary clips from auxiliary cable set to battery positive (+).
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‒ Place diode test lamp probe on each glow plug one after the other.
Diode lights up: glow plug OK.
Diode does not light up: replace glow plug
(tightening torque: 25 Nm)
Notes:
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◆ The tightening torque of 25 Nm must not be exceeded otherwise the annular gap between glow pin and threaded section will be squeezed together. This may cause the glow plugs to fail prematurely.
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◆ If no fault is found and the engine is still hard to start, the glow plugs should be visually examined whilst glowing (injectors removed).
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