A4 Quattro Wagon V6-2.8L (AHA) (1998)
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Connect VAG1527B LED voltage tester between relay socket terminals 28 (B+) and 29.
NOTE: The LED light will light dimly before and after cranking the starter.
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Briefly crank starter.
LED test light must light up.
If the LED test light does not light up while cranking the starter, check wiring as follows.
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Connect VAG1598/22 test box to ECM harness connector. (Numbers marked on ECM connector match those on test box). Refer to "Scan Tool
Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/22 Test Box" See: Powertrain Management/Computers and Control
Systems/Testing and Inspection
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Connect multimeter US1119 (Fluke 83 or equivalent) to check for open circuit between relay socket terminal 29 and test box socket 4.
Specified value: max. 1 Ohm
If resistance is NOT OK:
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Repair wiring using applicable wiring diagram.
If the wiring is OK, but the LED test light does not light up:
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Replace Motronic ECM -J220-.
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Carry out adaptation of throttle valve control module to ECM.
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Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.