Glow Plugs, Checking

Special tools and workshop equipment required 

• Fluke 83 multi-meter
• Adaptor kit VW 1594
• Voltage tester VAG1527B
• Swivel socket 3220 with extension

Checking Conditions 

• Battery voltage 11.5 volts minimum
• Ignition switched OFF
• Diesel direct injection system engine control module -J248- OK
• Glow plug strip fuse -S163- OK
• Production number on reverse side of glow plug relay must be: "180"

Checking Sequence 

-- Disconnect harness connector from engine coolant temperature -G62- sensor (-arrow-).

-- Disconnect glow plug harness connectors from glow plugs -Q6-.

-- Switch ON ignition.

-- Switch Fluke 83 multi-meter to 20 volt range.

-- Connect multi-meter between cyl. 1 glow plug harness connector and ground then repeat checking sequence for cylinders 2, 3 and 4.

• Specification: Battery voltage for approximately 20 secs.

If no voltage present:

refer to SYSTEM WIRING DIAGRAM

If voltage present:

-- Switch OFF ignition.

-- Disconnect harness connectors from glow plugs.

-- Connect voltage tester VAG1527B lead to battery + using jumper wire from VW 1594 adaptor kit.

-- Touch tester probe to each glow plug, one after the other.

• If LED lights up: glow plug OK
• If LED does not light up: replace glow plug

-- Remove and install glow plugs using 3220 swivel socket.

• Tightening specification: 15 Nm (11 ft lb)

-- Erase DTC memory DTC MEMORY, ERASING .

-- Set the readiness code READINESS CODE, SETTING .