S4 V8-4.2L (BHF) (2004)
NOTE: Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little
and then get slightly brighter during activation.
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Switch ignition off.
If LED does not blink:
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Connect test box to wiring harness of Engine Control Module (ECM), ECM is not connected.
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Check the following wire connections for open circuit according to wiring diagram:
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Specified value: Wire resistance max 1.5 Ohms
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Check wires for short circuit to each other as well as to B+ and Ground (GND).
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Specified value: Infinite Ohms (no continuity)
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If necessary, repair wire connection.
If no malfunctions are detected:
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Replace Engine Control Module (ECM).
Assembly is performed in reverse order of removal, note the following:
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory
2. If necessary, erase DTC memory
3. Generate readiness code.
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End diagnosis and switch ignition off.