A8 Sedan V8-3.7L (AEW) (1997)
Engine Speed Sensor: Testing and Inspection
Engine Speed (RPM) Sensor, Checking
Engine Speed (RPM) Sensor, Checking
Requirements
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RPM sensor properly installed (firmly seated)
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No metal shavings or damage on RPM sensor or sensor wheel
Checking
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Disconnect gray harness connector from RPM sensor.
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Connect multimeter US 1119 (Fluke 83 or equivalent) and measure resistance between connector terminals 1 and 2, using adapter cables from
VAG1594 connector test kit.
Specified value: approx. 0.5 to 2 kohms
If resistance is outside specified range:
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Replace RPM sensor.
If resistance is OK:
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Check resistance between terminals 1 and 3, and between terminals 2 and 3.
Specified value: infinite ohms (no continuity)
If resistance is not as specified (infinite):
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Replace RPM sensor.
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Check readiness code. If DTC memory has been erased, generate new readiness code.
Refer "Monitors, Trips and/or Drive Cycle (Readiness Code)/Checking, Readiness Code" See: Testing and Inspection
Refer "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code" See: Testing and Inspection
If resistance was as specified (no continuity):
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Check wiring between RPM sensor connector and ECM as follows:
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Connect VAG1598/19 test box to ECM harness connector. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAG1598/19
Test Box, Connecting" See: Testing and Inspection