TT Roadster L4-1.8L Turbo (AWP) (2003)
Engine Speed Sensor: Testing and Inspection
With Generic Scan Tool
Checking Additional Signals
Checking speed signal
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 requirements
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The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.
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Battery voltage must be at least 11.5 volts.
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Speedometer -G21- must be OK.
Test sequence
NOTE: To test speed signal, vehicle must be driven. Doing this requires a second person.
WARNING: Secure Scan Tool (ST) on the rear seat and have it operated from there by second technician.
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Connect diagnostic tester. See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan
Tool Connecting/With Generic Scan Tool/Diagnostic Tester, Connecting
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Start engine and let run at idle.
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Under address word 33, select "Diagnostic mode 1: Checking measured values."
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Select the measuring value "PID 13: Vehicle speed".
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Perform a road test, and have the 2nd person observe the indication on the display.
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Check specified value of the vehicle speed:
PID
Diagnostic text
Specified value:
13:
Vehicle speed
approx. vehicle speed
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End diagnosis and switch ignition off.
If no speed is indicated:
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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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To measure voltage, connect multimeter between sockets 3 (terminal 15) +54 (speed signal) of test box.
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Jack up front left wheel.
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Switch ignition on.
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Rotate front wheel, and observe voltage indicated while doing so.
Specified value: 0.0 to at least 4.0 V, fluctuating
NOTE: The right front wheel must not turn during this, hold it steady if necessary.
If indicated voltage does not oscillate:
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Remove instrument cluster.
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Check wire connection from Engine Control Module (ECM) to Speedometer -G21- according to wiring diagram.
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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