S4 Quattro Wagon V8-4.2L (BHF) (2008)
Ignition Coil: Testing and Inspection
Ignition Coils With Power Output Stage, Checking
Ignition Coils with Power Output Stage, Checking
The following procedure is used to diagnose all Ignition Coils with Power Output Stage.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Diode test lamp.
‹› Wiring diagram.
Test requirements
‹› The Ignition Coils with Power Output Stage (N70, N127, N291, N292, N323, N324, N325, N326) fuses OK.
‹› The Motronic Engine Control Module (ECM) Power Supply Relay (J271) OK.
‹› The Engine Speed (RPM) Sensor (G28) OK,.
‹› The Camshaft Position (CMP) Sensor (G40)OK, => [ Camshaft Position Sensors, Checking ] See: Computers and Control Systems/Testing and
Inspection/Component Tests and General Diagnostics/Component Tests (VAG Code Tests)/Camshaft Position Sensors, Checking.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Procedure
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Remove the engine cover with air filter Refer to Fuel Injection and Ignition Repair Information.
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Remove the Ignition Coils with Power Output Stage (N70, N127, N291, N292, N323, N324, N325, N326) electrical harness screws - 1 -.