Ignition Power Stage: Testing and Inspection

CHECKING POWER STAGE

4-pin Connector:

- Disconnect 4-pin harness connector from power output stage.
- Connect US 1115 LED tester or equivalent between battery positive (B+) and connector terminal 2 (GND).
^ LED must light up

If LED does not light up:
- Check wiring using wiring diagram and if necessary, repair open circuit.
- Disconnect harness connectors from all six fuel injectors.
- Switch ignition on.
- Connect LED tester between GND and power Output stage connector terminals 1, 3 and 4 in sequence.
- 0perate starter several seconds each time.
^ LED must blink

If LED does NOT blink:
- Connect VAG 1598 text box with VAG 1598/11 adapter to ECM wiring harness only. Refer to Computers and Control Systems, System Dignosis for VAG 1598 Pin Out Box Connecting. Connecting VAG 1598/31 Test Box
^ Adapter harness is not connected to ECM.
- Check for continuity or short circuit in wiring to ECM using wiring diagram.
- If applicable, eliminate open circuit or short circuit in wiring between 4-pin power output stage connector, and ECM connector -B-.

Ignition coil with ECM connector B
power output stage terminal
terminal
1 15
3 18
4 17

If there is no open circuit or short circuit:
- Replace ECM.

If LED blinks:
- The wiring is OK.

If Diagnostic Trouble Codes 00609, 00610, 00611 (Ignition Output 1, 2, 3) are displayed by the On-Board Diagnostics program:
- Replace power Output stage -N122-.