AUDI A4 2000 B5 / 1.G AFC Engine Ignition Coils Checking Workshop Manual

28-16


Ignition coils, checking

Notes:

Check wiring between power output stage and
ignition coils, and between the ignition coils and
the connector set in the connector bracket, for
insulation damage.
Component locations page 28
-1 .

Checking secondary resistance

- Disconnect ignition wires from the ignition
coils.

If the specified resistance is not obtained for any one coil: - Switch Fluke 83 multimeter to resistance range and connect between
the two posts of the ignition coil being tested.

Specified value: 9000-14000 - Replace ignition coil.
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Checking primary resistance

- Disconnect power output stage harness
connector page 28
-7 .

- Check connectors for loose, corroded terminals
or terminals that have been pushed out of their
connector housing, and repair as necessary.

Note:
The connector sequence in the connector
bracket is immaterial because all three B+
terminals route to the ignition coils.

- Connect one multimeter test leads between ignition coil connector
terminal in connector bracket...

... and 3-pin power output stage connector (for each coil).

Specified value: max. 5.0
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If the specified resistance is not obtained for any coil:
- Replace ignition coil.
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28-18

Checking voltage supply

Fuse for ignition coils OK

- Disconnect white connector on connector
bracket page 28
-1 .

- Switch ignition on.

If the specified values are not obtained: - Switch Fluke 83 multimeter to voltage range and connect in sequence
between Ground (GND) and all three terminals of the connector.
Specified value: approx. battery voltage
- Check for open circuit using wiring diagram, repair as necessary, also
check fuses.
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