Throttle Position Sensor, Checking

Special tools and workshop equipment required 

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

Test Prerequisites 

• Fuses in E-box (plenum chamber, left) must be OK: Refer to SYSTEM WIRING DIAGRAM
  Fig 1: Identifying Fuse Holder

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• Battery voltage must be at least 11.5 volts.
• All electrical consumers such as, for example, lights and rear window defroster must be switched off.
• For vehicles with automatic transmission, selector lever must be in P.
• If vehicle is equipped with an A/C system, it must be switched off.
• Ground (GND) connections between engine and chassis must be OK.
• Ignition is switched off.

Test Sequence 

-- Remove footwell cover (driver's side).

-- Disconnect 6-pin connector from Throttle Position (TP) Sensor.

-- Switch ignition on.

Checking Voltage Supply and Wiring 

-- Connect multimeter to the following connector terminals for voltage measurement.

Terminal 1 + Ground (GND)

Terminal 1 + 5

Terminal 2 + Ground (GND)

Terminal 2 +3

Specified value: at least 4.5 V

-- Switch ignition off.

If specified values are not obtained:

-- Connect test box (VAG1598/42) to Engine Control Module (ECM) -J623- wiring harness using adapter cable (1598/39-2), connecting test box for wiring test.

-- Check wires between test box and connector for open circuit according to wiring diagram.

Terminal 1 + socket 59

Terminal 2 + socket 84

Terminal 3 + socket 39

Terminal 4 + socket 83

Terminal 5 + socket 61

Terminal 6 + socket 17

Wire resistance: max. 1.5Ω

-- Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.

Specified value: ∞ Ω

If no malfunction is detected in the wiring and if the voltage supply was OK:

-- Replace Throttle Position (TP) Sensor -G79-  ACCELERATOR LINKAGE, SERVICING.

-- Erase DTC memory of Engine Control Module (ECM) DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Generate readiness code READINESS CODE .