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 MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORTESTING AND INSPECTIONCHECKING THROTTLE POSITION SENSORCHECKING WIRING
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Checking Wiring
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Checking Wiring
NOTE:
For functional testing of the Throttle Position Sensor (TPS), also see On-Board Diagnostics, "Read Measuring Value Block" function 08, display group 002. Testing and Inspection
CHECKING WIRING TO ENGINE CONTROL MODULE
- Connect VAG 1598 test box with VAG 1598/11 adapter harness to the Engine Control Module (ECM). Connecting VAG 1598/31 Test Box
^ Adapter harness for ECM is not connected.
- Test for continuity between throttle position sensor Ground terminal 2 and test box socket 45.
^ Specified value: maximum 1.0 ohm
- Test for continuity between throttle position sensor positive terminal 1 and test box socket 46.
^ Specified value: maximum 1.0 ohm
- Test for continuity between throttle position sensor signal wire terminal 3 and test box socket 47.
^ Specified value: maximum 1.0 ohm
If specifications are not achieved:
- Determine open and/or short circuit in wiring harness between 6-pin TP sensor connector in engine compartment and ECM connector -A- according to wiring diagram, and repair as necessary.
6-pin connector ECM connector A
1 6
3 7
2 Ground (GND)
NOTE:
Use only gold-plated terminals for repairing terminals in the terminal connector for throttle position sensor.
- Check and erase Diagnostic Trouble Code (DTC) memory.
If there is no malfunction in wiring harness or connections:
- Replace ECM .
For functional testing of the Throttle Position Sensor (TPS), also see On-Board Diagnostics, "Read Measuring Value Block" function 08, display group 002. Testing and Inspection
CHECKING WIRING TO ENGINE CONTROL MODULE
- Connect VAG 1598 test box with VAG 1598/11 adapter harness to the Engine Control Module (ECM). Connecting VAG 1598/31 Test Box
^ Adapter harness for ECM is not connected.
6-Pin Connector:
- Test for continuity between throttle position sensor Ground terminal 2 and test box socket 45.
^ Specified value: maximum 1.0 ohm
- Test for continuity between throttle position sensor positive terminal 1 and test box socket 46.
^ Specified value: maximum 1.0 ohm
- Test for continuity between throttle position sensor signal wire terminal 3 and test box socket 47.
^ Specified value: maximum 1.0 ohm
If specifications are not achieved:
- Determine open and/or short circuit in wiring harness between 6-pin TP sensor connector in engine compartment and ECM connector -A- according to wiring diagram, and repair as necessary.
6-pin connector ECM connector A
1 6
3 7
2 Ground (GND)
NOTE:
Use only gold-plated terminals for repairing terminals in the terminal connector for throttle position sensor.
- Check and erase Diagnostic Trouble Code (DTC) memory.
If there is no malfunction in wiring harness or connections:
- Replace ECM .
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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.