90CS Quattro V6-2.8L (AFC) (1995)
Ignition Power Stage: Testing and Inspection
CHECKING POWER STAGE
4-pin Connector
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Disconnect 4-pin harness connector from power output stage.
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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:
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Check wiring using wiring diagram and if necessary, repair open circuit.
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Disconnect harness connectors from all six fuel injectors.
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Switch ignition on.
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Connect LED tester between GND and power Output stage connector terminals 1, 3 and 4 in sequence.
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0perate starter several seconds each time.
^
LED must blink
If LED does NOT blink:
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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. See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and
Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/31 Test Box
^
Adapter harness is not connected to ECM.
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Check for continuity or short circuit in wiring to ECM using wiring diagram.
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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:
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The wiring is OK.
If Diagnostic Trouble Codes 00609, 00610, 00611 (Ignition Output 1, 2, 3) are displayed by the On-Board Diagnostics program:
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Replace power Output stage -N122-.