TT Roadster L4-1.8L Turbo (AWP) (2003)
Engine Speed Sensor: Testing and Inspection
With Generic Scan Tool
Check Engine Speed (RPM) Sensor
Function
The Engine Speed (RPM) Sensor -G28- detects engine speed and reference marks. Without an engine speed signal, the engine will not start. If the engine
speed signal fails while the engine is running, the engine will stop immediately.
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test sequence
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Measure sensor resistance between terminals 2 + 3 at connector to sensor.
Specified value: 730...1000 Ohm
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Check sensor for short circuit between terminals 1 + 2 as well as 1 + 3.
Specified value: Infinite Ohm
If specified values are not obtained:
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Replace Engine Speed (RPM) Sensor -G28-.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase
Diagnostic Data
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes/Audi
Drive Cycle/Readiness Code/With Generic Scan Tool/Readiness Code, Generating
If no DTC is found on sensor:
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Connect test box to control module wiring harness, connect test box for wiring test. See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring
Test
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Check wires between test box and 3-pin connector for open circuit according to wiring diagram.
Terminal 1 + socket 108
Terminal 2 + socket 90