Throttle Position Sensor

Throttle Position sensor, checking and adjusting

NOTE:
For functional testing of the Throttle Position Sensor (TPS), also see On Board Diagnostic, "Read Measuring Value Block" function 08, display group 002. Testing and Inspection

Checking battery positive voltage (B+) supply

- Disconnect harness connector from TPS.
- Switch ignition on.

6-Pin Connector:

- Connect multimeter to measure voltage between terminals 1 (positive) and 2 (Ground); then between terminals 1 (positive) and 3 (signal wire).
^ Specified values: 4.5-5.5 volts (in each case)

If specified value is obtained:

- Check resistance of TPS.

If one of the specified values is not obtained:

- Check wiring to the Engine Control Module (ECM).

Checking wiring to ECM from TP sensor harness connector

- Connect VAG 1598 test box with VAG 1598/11 adapter harness to ECM. Connecting VAG 1598/31 Test Box
^ Adapter harness for ECM is not connected.

6-Pin Connector:

- Test for continuity between throttle position sensor Ground terminal 2 and test box socket 45.
^ Specified value: maximum 1 (ohm)
- Test for continuity between throttle position sensor positive terminal 1 and test box socket 46.
^ Specified value: maximum 1 (ohm)
- Test for continuity between throttle position sensor signal wire terminal 3 and test box socket 47.
^ Specified value: maximum 1 (ohm)

If specifications are not achieved:

- Determine open and/or short circuit in wiring harness between 6-pin TP sensor connector in engine compartment and ECM connector -A- according to wiring diagram, and repair as necessary.

6-pin connector ECM connector A
1 6
3 7
2 Ground (GND)

NOTE:
Use only gold-plated terminals for repairing terminals in the terminal connector for throttle position sensor.

- Check and erase Diagnostic Trouble Code (DTC) memory.

If there is no malfunction in wiring harness or connections:

- Replace ECM .

Checking TPS resistance

- Disconnect harness connector at the TPS.

Throttle Position Switch/Sensor Terminals:

- Connect multimeter (Fluke 83 or equivalent) to terminals 1 and 2.
^ Specified value: 1500-2600 (ohms)
- Connect multimeter to terminals 2 and 3.
^ Closed throttle position: approx. 750-1300 (ohms)
- Slowly operate accelerator pedal fully.
^ Wide open throttle: maximum 3600 (ohms).

If either specification is not achieved:

- Replace TPS.
- Check and erase DTC memory.

Adjusting TPS

If the setting of the closed throttle position switch is adjusted, the throttle position sensor is automatically adjusted as well

See adjustment procedure under Closed Throttle Position Switch.