A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
Engine Speed Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Engine Speed (RPM) Signal, Checking
Vehicles with automatic transmission
NOTE:
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The signal is generated by the Engine speed (RPM) sensor -G28- processed in the Engine Control Module (ECM) and directed to various parts of
the electronic system (e.g. control module for A/C or ABS / EDS) from terminal 37 of the ECM. Engine speed signal and wire connections are
monitored by these systems.
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Checking Engine speed (RPM) sensor -G28- See: Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Engine Speed (RPM) Sensor -G28-, Checking
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Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect ECM. See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Generic Scan Tool/Scan Tool Connecting/Test Box,
Connecting For Wiring and Component Test
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Check for open circuit and short to positive (B+) or ground (GND) in following wiring connections:
Test box
Instrument cluster
V.A.G 1598/31
terminal
Socket
37
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Repair any open/short circuit as needed.
If no problems with wiring are found:
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Checking CAN bus.