VW Golf Mk1 Workshop Service and Repair Manuals

Specials tools, testers and auxiliary items

• ◆ Test box V.A.G 1598/18
• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Diode test lamp V.A.G 1527
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram.

Check conditions

• ● Hall sender OK.

• ● Engine speed OK.
• ● Ignition voltage supply.

Checking voltage supply

• ‒ Pull 3 pin connector off ignition transformer.
• ‒ → Connector multimeter to measure voltage with aux cables from V.A.G 1594 to the contact 1 + 3 of the disconnected plug.
• ‒ Switch on ignition.
       Specification: min. 11 V

If no voltage is present:

• ‒ Switch off ignition.
• ‒ Check wiring between 3 pin connector connect 1 and earth for open circuit according to current flow diagram.
       Wire resistance: max. 1.5 ω
• ‒ Check wire between 3 pin connector contact 3 and relay plate for open circuit according to current flow diagram.
       Wire resistance: max. 1.5 ω

Checking activation

• ‒ → Connect diode lamp V.A.G 1527 with aux. cables from V.A.G 1594 and adapter V.A.G 1594/15 to contact 2 + 3 of the plug.
• ‒ Operate starter and check ignition signal from Motronic control unit.
       LED must flicker.
• ‒ Switch of ignition.

The LED does not flicker:

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
• ‒ Check wire between test box socket 24 + 3 pin connector contact 2 for open circuit according to current flow diagram.
       Wire resistance: max. 1.5 ω
• ‒ Additionally check wires for short to one another.
       Specification: ∞ω

If no wiring fault is detected and voltage was present between contact 1 + 3:

• ‒ Replace Motronic control unit (J220)
  , item 3

If the voltage supply and activation is OK:

• ‒ Replace ignition transformer.