Volkswagen Workshop Service and Repair Manuals

Checking voltage supply

• ● Hall OK., checking .

• ‒ ▸07.93: Pull plug off cold start valve.
• ‒ → Pull connector -1- fror injectors off fuel manifold -2-.
• ‒ → Check voltage supply for all injectors. To do this, connect diode test lamp V.A.G 1527 with aux. cables from V.A.G 1594 to plug -1-.
• ‒ Operate starter.
       The LED must flicker

LED permanently lid:

• ‒ Renew earth strap from battery to gearbox.
• ‒ Renew Digifant control unit (J169).

LED does not light up or flicker:

• ‒ Attach connector for injectors.
• ‒ Carry out electrical check, test step 7 , if necessary renew Digifant control unit (J169).

Checking resistance

• ‒ → Check resistance on connection -2- for all injectors using hand multimeter V.A.G 1526 and aux. cables from V.A.G 1594.
       Specification: 3.7...5.0 ω(all 4 injectors OK.)

If the specification is not attained:

• ‒ Remove fuel manifold with injectors => Page 24-60 , removing and installing injectors.

• ‒ → Remove bolt -1- and lever fuel manifold upper part -2- of fuel manifold - 3 - as indicated by arrows.
• ‒ Repeat check on individual injectors, if necessary renew injector(s).
       Specification: 15...20 ω

Checking spray pattern and for leaks

• ● ▸07.93: Cold start valve connector pulled off.

• ‒ Remove fuel manifold with injectors => Page 24-60 .

• ‒ Connect supply and return pipes to fuel manifold, using extension hoses if necessary.
• ‒ ▸07.93: Reconnect cold start valve hose.
• ‒ → Place injectors in the measuring appliance V.A.G 1602.
• ‒ Attach connector -2- to fuel manifold connection -1-.
  
• ‒ → Pull 2-pin plug off coolant temperature sender (G62).
• ‒ Pull plug off ignition transformer.
• ‒ Operate starter. The injectors must spray uniformly.
• ‒ Switch off ignition and check injectors for leaks. No more than
       2 drops/min
  may leak from each injector.

Note:

When installing the injectors ensure that the O rings

are not damaged.