Throttle Position (TP) Sensor, Checking and Adjusting
NOTE:
- To functionally check the Throttle Position (TP) sensor, See Read measuring value block, display group 002.
- Component locations, refer to "Component Overview - II", Locations
Checking resistance
- Switch multimeter (Fluke 83 or equivalent) to measure resistance (ohms) and connect between terminals 1 and 2.
Specified value: 1500 to 2600 ohms
- Measure resistance between terminals 2 and 3.
Specified value (closed throttle): approx. 750 to 1300 ohms
- Slowly move throttle from closed throttle position to wide open throttle position.
- Resistance must increase gradually to max. 3600 ohms
If any one of the specified values is not obtained:
- Replace throttle position sensor.
Checking voltage supply
- Disconnect TP sensor harness connector.
- Switch ignition ON.
- Switch multimeter (Fluke 83 or equivalent) to measure resistance (ohms) and connect in sequence between terminals 1 (B+) and 2 (GND), then between terminals 1 (B+) and 3 (signal).
Specified value: 4.5 to 5.5 volts
If neither specified value is obtained:
- Check TP sensor resistance, See Checking resistance.
If one of the specified values is not obtained, check ECM wiring as follows:
- Connect VAG 1598/19 test box to ECM harness connector.
- Check Ground (GND) wire for continuity between TP sensor connector terminal 2 and test box socket D12.
Specified value: max 1 ohms (ohms)
- Check B+ wire for continuity between TP sensor connector terminal 1 and test box socket A3.
Specified value: max. 1 ohms (ohms)
- Check signal wire for continuity between TP sensor connector terminal 3 and test box socket A24.
Specified value: max. 1 ohms (ohms)
If the specified value is not obtained:
- Determine open or short circuit in wiring using wiring diagram; repair as necessary.
6-pin TP sensor ECM connector A
connector terminal terminal or Ground
1 A3
3 A24
2 Intake manifold Ground (GND)
NOTE: If it becomes necessary to repair or replace any of the throttle position sensor electrical terminals, ONLY replace with gold-plated terminals.
If the wiring is OK:
- Replace ECM.
Adjusting Throttle Position (TP) sensor
NOTE:
- By adjusting the Closed Throttle Position (CTP) switch, the Throttle Position (TP) sensor becomes automatically adjusted.
- Adjusting Closed Throttle Position (CTP) switch, Testing and Inspection