Checking ignition coils and output stages AJK ARE AZA .pdf

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Checking ignition coils and output stages on vehicles with engine code “AJK”, “ARE... Page 1 of 7

Checking ignition coils and output stages on
vehicles with engine code “AJK”, “ARE” and
“AZA”
  Note
Misfiring is monitored by the self-diagnosis, except for vehicles
with engine code “AJK”. This means that a cylinder which is not
firing is stored in the fault memory together with the appropriate
cylinder number. The advantage of this is that fault finding can,
for example, be started from a specific cylinder in the case of
fault. Therefore interrogate the engine control unit before
starting this test.

Special tools and workshop equipment required
t

Hand-held multimeter -V.A.G 1526 A- or -V.A.G 1526 B-

t

Voltage tester -V.A.G 1527 B-

t

Adapter set -V.A.G 1594 A- or -V.A.G 1594 C-

t

Adapter cable, 121-pin -V.A.G 1598/31- (test box)

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Checking ignition coils and output stages on vehicles with engine code “AJK”, “ARE... Page 2 of 7

Procedure
l

No faults stored relating to any of the injectors.

The procedure for identifying an inoperative or misfiring cylinder
is as follows:


Check misfiring detection on vehicles with engine code
“ARE” and “AZA” → Chapter.

If misfiring has been detected:


Continue with testing at cylinder indicated ⇒ “When
defective cylinder has been identified”.

If no misfiring has been detected:


With engine running, unplug connectors at injectors one
after the other and observe how the engine runs.



Or compare the spark plugs of all cylinders, and look for
soot deposits on electrodes.

When defective cylinder has been identified:


Connect multimeter to spark plug connector to measure
resistance.
  Note

The spark plug connector can be detached from the ignition
coil.
l

Specification: approx. 2 kΩ.

If specification is not obtained:


Renew spark plug connector.

If reading matches specification:


Exchange spark plug of defective cylinder with that of
another cylinder. Before exchanging spark plug, perform
visual check of spark plug for damage (ceramic section of
spark plug may have cracked).

If the fault now occurs at the other cylinder:


Renew the spark plug.

If the fault remains in the same cylinder:


Exchange ignition coil of defective cylinder with that of
another cylinder. Before fitting the ignition coil, check it for
damage (the ignition coil may be cracked or ruptured).

If the fault now occurs at the other cylinder:


Renew ignition coil.

If the fault remains in the same cylinder:


Check earth connections.

Checking earth connections

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Checking ignition coils and output stages on vehicles with engine code “AJK”, “ARE... Page 3 of 7



Unplug 3-pin electrical connector on
ignition coil.



Use current flow diagram to check
earth connection between contact -4aof connector and earth for open circuit
and short to positive.

l

Specification: Wire resistance: max. 1.5
Ω.



Repair wiring connection if necessary.

If the earth connection is OK:


Connect multimeter (voltage measuring
range) between contact -15- of
connector and earth.



Unplug electrical connector at injector
of cylinder to be checked.



Operate starter.

l

Specification: approx. battery voltage

If specification is not obtained:


Use current flow diagram to check
wiring for open circuit and short to
positive.

If reading matches specification:


Unplug 3-pin electrical connectors -2on output stages for ignition coils.
  Note

Disregard -item 1-.



Consecutively connect voltage tester V.A.G 1527 B- between contacts -1-, -2

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Checking ignition coils and output stages on vehicles with engine code “AJK”, “ARE... Page 4 of 7

- and -3- on 3-pin connectors of both
output stages and earth. Then operate
starter for a few seconds.
l

The LED lamp should light up in each
case

If the specifications are not obtained:


Switch off ignition.



Check for open circuit and short to
positive or earth in the following wiring:

Contact assignment on 3-pin connector of
output stage

Component

3-pin connector of 3-pin connector of
output stage
ignition coil
Contact
Contact -1-

Black connector of
output stage -N122
Brown connector of
output stage 2 -2N192-3-

-1-

Cylinder 1

-2-

Cylinder 2

-3-

Cylinder 3

-1-

Cylinder 4
Cylinder 5
Cylinder 6

Contact assignment of 3-pin connector on
ignition coil
l

Specification: Wire resistance: max. 1.5
Ω.

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Checking ignition coils and output stages on vehicles with engine code “AJK”, “ARE... Page 5 of 7



Repair wiring connection if necessary.

Checking output stages of ignition coils
  Note
t

Output stage -N122- (black connector)
activates the ignition coils for cylinder
bank 1 (cylinders 1 to 3).

t

Output stage -N192- (brown connector)
activates the ignition coils for cylinder
bank 2 (cylinders 4 to 6).

Checking activation of output stages


Disconnect electrical connectors on all
six injectors to ensure no fuel is
injected during the test, as this could
damage the catalytic converter.



Unplug 4-pin electrical connectors -2on output stages for ignition coils.
  Note

Disregard -item 1-.



Consecutively connect voltage tester V.A.G 1527 B- between contacts -1-, -3
- and -4- on 4-pin connectors of both
output stages and earth. Then operate
starter for a few seconds.

l

LED lamp should flash each time (brief
impulse).

If specifications are not obtained:


Switch off ignition.



Connect adapter cable, 121-pin -V.A.G
1598/31- (test box) to wiring harness to
engine control unit, but do not connect
actual engine control unit → Chapter.



Check for open circuit and short to
positive or earth in the following wiring:

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Checking ignition coils and output stages on vehicles with engine code “AJK”, “ARE... Page 6 of 7

Component

Connector
Contact

-V.A.G 1598/31Socket

4-pin black
connector on
output stage -N122
-

-1-

94

-3-

110

-4-

102

4-pin brown
connector on
output stage 2 N192-

-1-

95

-3-

111

-4-

103

l

Specification: Wire resistance: max. 1.5 Ω.



Repair wiring connection if necessary.

If wiring is OK:


Connect 4-pin connectors -2- to both
output stages.
  Note

Disregard -item 1-.


Disconnect 3-pin connectors from
output stages.



Consecutively connect voltage tester V.A.G 1527 B- between contacts -1-, -2
- and -3- on 3-pin connectors of both

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Checking ignition coils and output stages on vehicles with engine code “AJK”, “ARE... Page 7 of 7

output stages and battery plus (+).
Then operate starter for a few seconds.
l

The LED lamp should flash each time.

If the LED lamp does not flash when
checking one or more of the contacts:
Check the earth connections for the output
stages as follows:


Disconnect 4-pin connectors from
output stages; fitting locations
→ Chapter.



Consecutively connect voltage tester V.A.G 1527 B- between contact -2- on
4-pin connectors of both output stages
and battery plus (+).

l

The LED lamp should light up in each
case.

If the diode test lamp does not light up:


Use current flow diagram to check
wiring for open circuit.

If the diode test lamp lights up:


Renew output stage.
  Note

Before installing, apply a coat of heat
conductor paste -G 052 170 A1- to the
metallic side of the new output stage. The
function of the paste is to prevent corrosion
between the output stage and the threaded
mounting and to conduct away the heat
generated by the output stage.

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