Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1526 A

• ◆ V.A.G 1594 A

Requirements for test:

• ● Battery voltage not less than 12.7 V
• ● Diesel direct injection system control unit -J248 okay

Test sequence

• ‒ → Pull out oil dipstick -1- from dipstick tube.
• ‒ Unclip protecting covers.
• ‒ Unscrew nuts -arrows- and remove engine cover panel.
• ‒ Remove noise insulation lying underneath.
• ‒ Re-insert dipstick into dipstick tube.

• ‒ → Unplug connector -2-.
• ‒ Remove bolt -3-.
• ‒ Pull fuel filter upwards out of bracket and move clear to one side with fuel hoses connected.

• ‒ Unplug 4-pin connector from coolant temperature sender -G62
  => Fitting locations overview Page 23-4.

Note:

Unplugging the connector for coolant temperature sender -G62 simulates the condition of the engine when cold. Therefore when the ignition is switched on, the glow plug system is activated.

• ‒ Pull glow plug connector off glow plug.
• ‒ Connect multimeter (voltage test range) between glow plug connector and engine earth.
• ‒ Switch on ignition.
• ‒ Specification: approx. battery voltage for about 20 seconds

Notes:

• ◆ Glow period warning lamp -K29 should light up during the simulated glow period.
• ◆ If the warning lamp does not light up, test glow period warning lamp -K29 => Page 01-55.

• ‒ Switch off ignition.

If the specification is not obtained:

• ‒ Check glow plug fuse in electronics box in plenum chamber

If the glow plug fuse is okay:

• ‒ Test glow plug relay=> Page 28-5.

If no fault is found, but the engine takes several seconds to start at very low temperatures:

• ‒ Test glow plugs => Page 28-11.