Volkswagen Workshop Service and Repair Manuals

Note:

• ◆ The specified values stated apply to an ambient temperature range of 0...+40 °C.
• ◆ The tests are performance with the hand multimeter V.A.G 1526

Checking TCI-H switch unit -N41-

• ● Ignition coil OK.

Engine code JB

• ‒ → Pull plugs of DIS switch unit by pressing against surface on plug/switch -arrows- and connect together.

Continuation for all vehicles

• ‒ Pull plug off TCI-H switch unit; to do so press wire clip.

• ‒ → Use auxiliary leads from V.A.G 1594 to connect up hand multimeter V.A.G 1526 between contacts 2 and 4 on plug.
• ‒ Switch on ignition.
       Specifications: approx. battery voltage.
• ‒ If not, locate eliminate open circuit using CFD.
• ‒ Switch off ignition.
• ‒ Reconnect plug to TCI-H switch unit.
• ‒ Pull plug of Hall sender (distributor).

• ‒ → Use auxiliary leads from V.A.G 1594 to connect up hand multimeter V.A.G 1526 between terminal 1 (-) and terminal 15 (+) of ignition coil.
• ‒ Switch on ignition.
  Specification: at least 2 volts; must drop off to 0 volts after 1...2 seconds.

If not, renew TCI-H switch unit and check whether sealing compound has oozed out of ignition coil; if necessary, renew ignition coil as well.

• ‒ Briefly connect centre wire of connector at distributor to earth.
  The voltage value indicated must briefly increase to at least 2 volts. If This is not the case, located and eliminated open circuit in centre wire/renew the switch unit.
• ‒ Switch off ignition.

• ‒ → Use auxiliary leads from V.A.G 1594 to connect hand multimeter V.A.G 1526 to outer contacts of plug of Hall sender (distributor).
• ‒ Switch on ignition.
       Specifications: at 5 volts.

Note:

If the defect is present despite the specified values being obtained, the TCI-H switch unit should be renewed, or the open circuit between the plug of the Hall sender and the switch unit is to be located and eliminated.

Checking Hall sender

• ● TCI-H switch unit OK.
• ● Ignition coil OK.
• ● Wire between TCI-H switch unit and distributor OK.

• ● Connector and connection parts on distributor, Hall sender and TCI-H switch unit OK.

• ‒ Pull high tension lead, terminal 4 out of distributor and earth it. Use auxiliary cable if necessary.
• ‒ Detach rubber grommet from connector, TCI-H switch unit. Connector remains attached.

• ‒ → Use auxiliary cables V.A.G 1594 to connect up hand multimeter V.A.G 1526 between contacts 3 and 6.
• ‒ Switch on ignition.
• ‒ Turn engine slowly by hand in direction of rotation and watch reading on the measuring instrument (hand multimeter).
       Specification: alternating between 0 and at least 2 V
• ‒ If not, renew Hall sender.