With Manufacturer's Scan Tool

Throttle Position sensor, checking

Special tools

Special Tools:

- Fluke 83 Digital multimeter
- VW 1594 Test kit
- VAG 1598/22 Test Box
- VAG 1551/1552 Scan Tool with VAG 1551/3 adapter cable
- Wiring diagram

Checking
- Connect VAG 1551/1552 Scan Tool and select engine control module "Address word 01 The ignition must be switched on.
Refer to Powertrain Management.






Indicated on display
- Press buttons -0- and -8- to select "Read measuring value block" function 08.
- Press -Q- button to confirm input,






Indicated on display
- Press -0-, -0- and -2- buttons to select "Display group 2".
- Press 0 button to confirm input.






- Check throttle position in display field 2. Do NOT depress the accelerator pedal.
- Specification: 0.0 %
- Also check Closed Throttle Position (CTP) switch display in display field 3. Center digit in field must show 1.
- Display must appear as shown: 010






- Slowly depress accelerator pedal until fully depressed and observe display fields 2 and 3.
Display field 2: Throttle position value must increase continuously.
- Specification at wide open throttle position: 100 %
Display field 3: Center digit must change to 0.
- Display must appear as: 000

Note: On vehicles with automatic transmission, the pressure point of the kick down switch must be felt before reaching the fully depressed accelerator pedal position.

- Press -> button.
- Press -0- and -6- buttons to select" End output" if unction 06.
- Press -Q- button to confirm input
- Switch ignition off.

If the end specification is not obtained:
- Replace Throttle Position (TP) sensor.
- Check DTC memory.
- Read readiness code.

If the DTC memory was erased or the constant voltage supply to the engine control module was interrupted, the readiness code must be initiated again.

If the display does not change or changes inconsistently:
- Check wiring for Throttle Position (TP) sensor -G79- as follows:
- Remove windshield wiper arms and plenum cover






- Connect test box VAG 1598/22 to harness connector of control module.
- Remove floor covering on driver's side.
- Disconnect electrical 6-pin connector for Throttle Position (TP) sensor -G79-.






- Check wiring for open circuit between test box and harness connector using wiring diagram.
Cavity 2 + test box socket 11
Cavity 3 + test box socket 23
Cavity 4 + test box socket 24
Cavity 5 + test box socket 12
Cavity 6 + test box socket 25
Wiring resistance: max. 1.5 0hms

Vehicles with automatic transmission






- Cavity 1 + test box socket 8
Wiring resistance: max. 1.5 0hms

- Also check wires for short circuit one against another, to vehicle ground and to battery positive voltage (B+).
- Wiring resistance: infinite ohms

If no fault:
- Replace Throttle Position (TP) sensor -G79-
- Check DTC memory.
- Read readiness code.

If the DTC memory was erased or the constant voltage supply to the engine control module was interrupted, the readiness code must be initiated again.