A8 Sedan V8-3.7L (AEW) (1997)
Ignition Power Stage: Testing and Inspection
Checking actuation
-
Remove bracket along with ignition coil power output stages -N122- and -N192- (arrows).
-
Disconnect all fuel injector harness connectors and hold-downs.
-
Disconnect 5-pin connectors (from ECM) from both power output stages.
-
Connect one lead of VAG 1527B LED voltage tester to engine Ground. Connect other lead in sequence to check for voltage at terminals 1, 2, 4
and 5 of each 5-pin connector.
For each test (at each connector terminal):
-
Briefly operate starter motor.
LED must flash each time.
If LED does not flash:
-
Connect VAG 1598/19 test box to Engine Control Module (ECM) harness connector. See: Computers and Control Systems/Testing and Inspection
-
Check wiring for open circuit, short to B+ or short to Ground between power output stage harness connector and ECM. See Electrical Wiring
Diagrams, Troubleshooting and Component Locations.