Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSENGINE SPEED (RPM) SENSOR, CHECKING
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Engine Speed (RPM) Sensor, Checking
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Engine Speed (RPM) Sensor, Checking
Engine Speed (RPM) Sensor, Checking
Location of RPM sensor -G28-.
Requirements
- RPM sensor properly installed (firmly seated)
- No metal shavings or damage on RPM sensor or sensor wheel
Checking
- Disconnect gray harness connector from RPM sensor.
- 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:
- Replace RPM sensor.
If resistance is OK:
- 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):
- Replace RPM sensor.
- Check readiness code. If DTC memory has been erased, generate new readiness code.
Readiness Code Reading
Readiness Code, Generating
If resistance was as specified (no continuity):
- Check wiring between RPM sensor connector and ECM as follows:
- Connect VAG1598/19 test box to ECM harness connector. Connecting VAG 1598/19 Test Box
- 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)
- If there are no open or short circuits:
- Replace ECM and generate new readiness code Readiness Code, Generating
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.