Throttle Position Sensor: Testing and Inspection

Throttle Position (TP) Sensor, checking

Note: On vehicles with automatic transmission, the Throttle Position (TP) Sensor (G69) includes two sensors installed in one housing. To check the second sensor (automatic transmission only)refer to Automatic Transmission 096, Repair.

^ Battery Positive Voltage (B+) OK
^ Fuse 22 (S22) OK
^ Ground (GND) connections on engine and transmission OK (location: below lower section of intake manifold)
^ VAG 1551 Scan Tool (ST) connected Connecting VAG 1551 Scan Tool


- Switch ignition ON.
- Operate VAG 1551 Scan Tool (ST) according to information indicated on display.
- Press button -1- for "Rapid data transfer" operating mode.
- Press buttons -0- and -1- to enter address word 01 for "Engine Electronics."
- Press -Q- button to confirm input.
- Press => button.
- Press buttons -0- and -8- to select the "Read Measuring Value Block" function.
- Press -Q- button to confirm input.

- Indicated on display

[Read measuring value block HELP ]
[Enter display group number XX ]

- Press button -0- twice to enter display group number 00, and press -Q- button to confirm input.

- Indicated on display
(1-10 = display fields)

[Read measuring value block => ]
[1 2 3 4 5 6 7 8 0 10 ]

- Slowly open throttle valve fully and watch numbers in display fields -2- and -3-.
Display field -2-:
^ Value must increase steadily until throttle is 1/4 open; from then on, value must not change
Display field -3-:
^ Value must increase uniformly over entire range

- Press => button.
- Press buttons -0- and -6- to select the "End Output" function.
- Press -Q- button to confirm input.

If the values displayed are not as specified:
- Perform electrical tests Pinout Values and Diagnostic Parameters