Touareg V8-4.2L (AXQ) (2006)
Vehicle Speed Sensor Signal: Testing and Inspection
Speed Signal, Checking
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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Fuses in E-box (in plenum chamber, left) must be OK
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Motronic Engine Control Module (ECM) Power Supply Relay -J271- -position A3- must be OK, check
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Control module with indicator unit in instrument panel insert -J285- must be OK.
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Battery voltage must be at least 11.5 volts.
Function test
NOTE: To check the speed signal, vehicle must be driven at a speed above 5 km/h.
Observe the safety precautions that apply to road tests.
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Connect diagnostic tester.
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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 at a speed above 5 km/h while a 2nd person observes the indication on the display.
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Check specified value of the vehicle speed:
NOTE: Vehicle speed must not drop to below 5 km/h during test.
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End road test and switch ignition off.
If no speed is indicated:
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Check wires according to wiring diagram.
Checking wiring
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Connect test box to control module wiring harness. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Component Tests and General Diagnostics/Component Tests (VAG Code Tests)/Connecting Test Box For Wiring Test
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Remove instrument cluster:
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Check wire connection from Engine Control Module (ECM) to Control module with indicator unit in instrument panel insert -J285- according to
wiring diagram.
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Erase DTC memory of Engine Control Module (ECM).
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Generate readiness code.