General information
The throttle position sensor is a potentiometer with a sliding contact that moves according to the rotation of the throttle axis, indicating the opening angle of the valve. When the throttle axis rotates, the signal voltage of the throttle position sensor changes. Based on the change in the voltage value of the sensor signal, the electronic engine control unit determines the degree of opening of the throttle valve.
Based on the sensor signal, the engine control unit adjusts the injector opening signal duration and the ignition timing.
Engines 2.0 l/2.4 l. |
Engines 2.7 l. |
Troubleshooting Guide
1. The throttle position sensor signal is more important for the automatic transmission control system than for the engine control system. If the throttle position sensor is faulty, "shock" (jerky) gear shifting occurs and other malfunctions may occur.
2. If the engine idles abnormally or the engine throttle response is poor, check the throttle position sensor connector. (If the throttle position sensor connector is not connected correctly or there is poor contact in the connector, the tester may read that the idle mode is always off even when the accelerator pedal is released. This may cause the engine to idle abnormally or throttle response poorly.)
Checking the throttle position sensor
1. Disconnect the throttle position sensor connector.
2. Measure the resistance between the following terminals of the sensor connector:
- a) (2.0L/2.4L engines) Between terminal "1" (ground) and terminal "2" (power supply) of the sensor.
- b) (2.7L engine) Between terminal "2" ("ground") and terminal "1" (power supply) of the sensor.
Nominal value:
- 2.0L/2.4L engines: 3.5-6.5 kOhm
- 2.7L Engine: 1.6-2.4 kOhm
3. Connect an analog type ohmmeter between the following sensor connector terminals:
- a) (2.0L/2.4L engines) Between terminal "1" (ground) and terminal "3" (signal) of the sensor.
- b) (2.7 l engine) Between terminal "2" ("ground") and terminal "3" (signal) of the sensor.
4. Slowly open the throttle valve from fully closed (idle) to fully open position, check that the resistance changes smoothly in proportion to the throttle opening angle.
5. If the resistance either differs from the nominal value or does not change smoothly, replace the throttle position sensor.
6. Install the sensor and tighten its mounting bolts to the specified torque.
- Tightening torque: 1.5-2.5 Nm
Checking with a tester Measure the signal voltage of the throttle position sensor when the ignition switch is in the "ON" position or the engine is running.
Table. Nominal values.
| Engine condition | Nominal value |
| Idle speed (throttle valve fully closed) | 300 - 900 mV (2.0 l / 2.4 l) 250 - 800 mV (2.7 l) |
| Slow throttle opening | Increases with throttle opening |
| The throttle valve is fully open | 4250-4700 mV |