TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
Vehicle Speed Sensor: Testing and Inspection
Vehicle Speed Sensor (VSS) Signal, Checking
Vehicle Speed Sensor (VSS) Signal, Checking
Special tools and equipment
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VAG1526A
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VAG1527B
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VAG1594A
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VAG1598/31
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VAS5051 with VAG5051/1
or
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VAG1551 with VAG1551/3B
NOTE:
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The vehicle speed signal is generated by the Vehicle Speed Sensor (VSS) -G68- (at transmission) and processed in the instrument cluster.
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The processed signal enters at terminal 54 of the ECM and is used for idle stabilization and tip-in shock reduction during shifting.
Test requirement:
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Function and display of speedometer OK. Troubleshooting:
Test sequence
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Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01. See: Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial
Checks/Connecting VAS 5051/VAG1551 Scan Tool
Engine must run at idle for this.