Speed Signal, Checking

Special tools and workshop equipment required 

• Multimeter VAG1526 or multimeter VAG1715
• Connector test kit VAG1594
• Wiring diagram

Test requirements 

• Fuses in E-box (in plenum chamber, left) must be OK: Refer to SYSTEM WIRING DIAGRAM
  Fig 1: Identifying Fuses In E-Box (In Plenum Chamber, Left)

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• Motronic Engine Control Module (ECM) Power Supply Relay -J271- must be OK, check: Refer to SYSTEM WIRING DIAGRAM
• Control module with indicator unit in instrument panel insert -J285- must be OK.
• Battery voltage must be at least 11.5 volts.

Function test 

-- Connect diagnostic tester.

-- Start engine and let run at idle.

-- Under address word 33, select "Diagnostic mode 1: Checking measured values."

-- Select the measuring value "PID 13: Vehicle speed".

-- Perform a road test at a speed above 5 km/h while a 2nd person observes the indication on the display.

-- Check specified value of the vehicle speed:

PID		Diagnostic text		Specified value:
13:		Vehicle speed		approx. vehicle speed

-- End road test and switch ignition off.

If no speed is indicated:

-- Check wires according to wiring diagram.

Checking wiring 

-- Connect test box to control module wiring harness, connect test box for wiring test.

-- Remove instrument cluster:

-- Check wire connection from Engine Control Module (ECM) to Control module with indicator unit in instrument panel insert -J285- according to wiring diagram. Refer to SYSTEM WIRING DIAGRAM

-- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.

-- Generate readiness code.