Ignition Power Stage: Testing and Inspection

IGNITION COIL POWER OUTPUT STAGE:
CHECKING REQUIREMENTS:
- Fuse for ignition coils OK.
- Ignition coils OK.

CHECKING VOLTAGE SUPPLY:




- Disconnect 3-pin power output stage harness connector.
- Switch Fluke 83 multimeter to voltage range and connect between Ground (GND) and terminals 1, 2 and 3 in sequence.
- Switch ignition on.

Specified Value: approx. battery voltage.

If the specified value is not obtained:
- Eliminate open circuit in wiring using wiring diagram.

CHECKING GROUND (GND):

4-pin Connector:

- Disconnect 4-pin power output stage harness connector.
- Switch Fluke 83 multimeter to voltage range, connect between connector terminal 2 (GND) and battery positive voltage (B+).

Specified Value: approx. battery voltage.

If the specified value is not obtained:
- Eliminate open circuit using wiring diagram; repair as necessary.

CHECKING TRIGGERING:

4-pin Connector:

- Disconnect 4-pin power output stage harness connector.
- Disconnect all six fuel injector harness connectors.
- Connect voltage tester between Ground (GND) and connector terminals 1,3 and 4 in sequence.
- Switch ignition on.
- Operate starter for several seconds.

Voltage tester must flash.

If voltage tester does not flash:
- Switch ignition off.




- Switch Fluke 83 multimeter to resistance range and check wiring for continuity between power output stage harness connector and ECM harness connector.
- Connect VAG 1598/19 test box to ECM harness connector.
- Locate open circuit using wiring diagram; repair as necessary.

Power Output Stage ECM Connector B
Terminal Number Terminal Number
1 B7
3 B6
4 B5

If wiring is OK:
- Replace ECM.

If voltage tester flashes, wiring is OK.

If during On Board Diagnostic, the diagnostic trouble codes P1393/17801,F1394/17802, or P1395/17803 ("Ignition Coil Power Output Stage 1/2/3 Electrical Malfunction") are displayed:
- Replace ignition coil power output stage.