S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
Ignition Coil: Testing and Inspection
Ignition Coils and Plug Connectors
Ignition Coil Cover Mounting Screws
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Remove screws from ignition coil mounting bracket (arrows).
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Remove spark plugs.
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Disconnect harness connectors from all five fuel injectors.
Ignition Coils Removed
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Install spark plugs in the spark plug connectors (if necessary, use new spark plugs) and place on the cylinder head cover as shown in the
illustration.
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Operate starter and check for spark at spark plugs.
WARNING:
During the test, DO NOT touch ignition coil mounting bracket or spark plugs. There is a danger of electrical shock.
If there is weak or missing spark on one or more of the spark plugs:
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Repeat test using other spark plugs.
If spark is still unsatisfactory:
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Remove spark plug connector involved.
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Measure resistance of the spark plug connector using Digital Volt Ohm Multimeter (DVOM).
^
Must be approximately 5000 ohms.
If NO:
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Replace spark plug connector.
If YES:
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Check voltage supply of ignition coils.
If the voltage supply is OK:
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Check control of power output stages.
If the control of the power output stages is OK and the malfunction only occurs on one or another spark plug:
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Temporarily transpose the two power output stages as a test and repeat spark test.