A8L V8-4.2L (BFM) (2004)
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Replace spark plug.
If malfunction remains at original cylinder:
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Switch ignition coil from faulty cylinder with one from another cylinder.
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If a malfunction now occurs at other cylinder, replace the ignition coil.
If malfunction remains at the cylinder, check Ground (GND) connection.
Checking Ground (GND) wire of ignition coil
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Disconnect the 4-pin connector at the respective ignition coil.
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Check Ground (GND) connection from 4-pin connector socket 4 to engine Ground (GND) for open circuit and short circuit to B+.
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Repair open circuit in wiring or short circuit if necessary.
If Ground (GND) connection is OK: Check voltage supply of ignition coil.
Checking voltage supply of ignition coil
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Connect multimeter to the following connector terminal for voltage measurement:
4-pin connector at
Measure to
wiring harness,terminal
1
Engine Ground (GND)
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Operate starter.
Specified value: approx. battery voltage
If specified value is not obtained:
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Check wire connection from terminal 1 to Fuel Pump (FP) relay via fuse for continuity, repair if necessary.
If specified value is obtained.
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Check power output stage. See: Power Output Stages For Ignition Coils, Checking