Volkswagen Workshop Service and Repair Manuals

Checking with TCI tester V.A.G 1451

• ‒ Carry out test per tester operating instructions.

Checking with hand multimeter V.A.G 1526 and auxiliary leads from V.A.G 1594

Notes:

• ◆ The specifications given are valid for an ambient temperature of 0...+40°C.
• ◆ If the measured values deviate from the specification, check wiring for open circuit in accordance with current flow diagram before replacing components.

A - Checking TCI-H switch unit -N41-

Ignition coil OK, checking =>page 28-25

On engines with DIS

• ‒ → Pull plugs off DIS switch unit and connect together.

• ‒ Pull plug of TCI-H switch unit -N41-; to do so press wire clip.

• ‒ → Connect hand multimeter with auxiliary cables between contacts -4- and -2- on connector.
• ‒ Switch on ignition.
       Specification: Approx. battery voltage

Otherwise locate open circuit with aid current flow diagram, and rectify:

=> Current flow diagrams, Electrical fault finding and Fitting locations

• ‒ Switch off ignition.

• ‒ Re-connect plug to TCI-H switch unit.
• ‒ Pull plug off Hall sender (distributor); to do so pres wire clip.

• ‒ → Connect hand multimeter with auxiliary cables between 1 (-) and terminal 15(+) on ignition coil.
• ‒ Switch ignition on.
       Specification:
       At least 2 volts. must drop 0 after approx.1...2 seconds.

Otherwise renew TCI-H switch unit and check whether sealing compound has escaped from the ignition coil. If necessary, renew ignition coil as well.

• ‒ Briefly earth centre wire of distributor connector. The indicated voltage must rise briefly to at least 2 V.
  Otherwise, locate open circuit in centre wire and eliminate/renew TCI-H switch unit.
• ‒ Switch off ignition.

• ‒ → Connect hand multimeter with auxiliary cables to outer contacts of Hall sender connector (distributor).
• ‒ Switch on ignition: at least 5 volt

Note:

If the fault still exist although the specifications are obtained, the TCI-H switch unit should be sender connector and switch unit located and rectified.

B - Checking Hall sender -G40-

• ● TCI-H switch unit OK.
• ● Ignition coil OK.
• ● Wire between TCI-H switch unit and distributor OK.
• ● Connector and connecting elements at distributor, Hall sender and TCI-H switch OK.

• ● On engines with DIS:
• ‒ Pull cable out of terminal 4 on distributor and earth it using an auxiliary cable from V.A.G 1594.

• ‒ → Connect hand multimeter with auxiliary cables from V.A.G1594 Between contact 6 and 3 of attached connector for TCI-H switch unit.
• ‒ Switch on ignition.
• ‒ Turn engine slow by hand in normal direction or rotation and watch reading on tester.
       Specification: Alternating between 0 and min. 2 volts.

If not replace Hall sender -G40-.