Volkswagen Workshop Service and Repair Manuals

Note:

Vehicles with engine code AAZ are fitted with a door-contact-controlled pre-glow system, i.e. pre-glow begins automatically as soon as the driver's door is closed.

Check door contact control=>Current flow diagram

Test conditions

• ● Battery voltage at least 11.5 V
• ● Engine cold
• ● Voltage exists at glow plugs. No voltage, locate fault according to current flow diagram.

Special tools, testers and auxiliary items

• ◆ Diode test lamp V.A.G 1527