A8 Sedan V8-3.7L (AEW) (1997)
Engine Speed Sensor: Testing and Inspection
Engine Speed (RPM) Signal, Checking
Engine Speed (RPM) Signal, Checking
NOTE:
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The RPM signal is required for the tachometer ABS control module and the A/C system.
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The RPM signal, generated by the Engine Speed (RPM) sensor -G28-, is processed and distributed by the Engine Control Module (ECM).
Check RPM signal as follows:
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Connect VAG1551 Scan Tool and press -0- button twice, to select "Automatic Test Sequence" function 00. Refer "Scan Tool Testing/Scan Tool
Connecting and Initial Checks/VAG1551 or VAG1552 Scan Tool" See: Testing and Inspection
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There must be no malfunctions stored in Diagnostic Trouble Code (DTC) memory that refer to "Missing RPM Signal."
If DTCs indicating missing RPM signal are stored:
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Check wiring for short circuit between appropriate control module and ECM.