A8 Sedan V8-3.7L (AEW) (1997)
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Check wiring for open circuit, or short circuit to B+ or Ground, between 3-pin connector (sensor coupling) and ECM.
RPM sensor coupling terminal
VAG1598/19 test box socket (ECM terminal)
1
A18
2
A17
3
D11 (Ground)
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If there are no open or short circuits:
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Replace ECM and generate new readiness code. Refer "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code" See:
Powertrain Management/Computers and Control Systems/Testing and Inspection