P0121

WIRING DIAGRAM





CIRCUIT DESCRIPTION
The throttle position sensor is connected to the throttle valve shaft on the throttle body, and detects the throttle valve opening. The closed throttle position (idle position) is detected by means of the contact point which turns ON in that position. The throttle opening is detected by the potentiometer as follows. A 5-volt reference voltage is applied to the sensor from ECM and as its brush moves over the print resistance according to the throttle valve opening, the output voltage varies accordingly. By monitoring sensor output voltage, ECM detects the throttle valve opening. ECM uses the signal from TP sensor as one of the signals to control various devices. Also, ECM converts the voltage signal from TP sensor into ON/OFF signal and sends it to transmission control module, where it is used as one of the signals to control the automatic transmission.





DETECTING CONDITION AND POSSIBLE CAUSE

DTC CONFIRMATION PROCEDURE

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and a tester, on a level road.

1. Turn ignition switch OFF. Clear DTC with ignition switch ON, check vehicle and environmental condition for:
- Indication of fuel level meter in combination meter: 1/4 or more
- Altitude (barometric pressure): 2400m, 8000ft or less (560mmHg, 75kPa or more)
- Ambient temp.: -10°C, 14°F or higher
- Intake air temp.: 50°C, 122°F or lower
2. Warm up engine to normal operating temperature.
3. Increase vehicle speed to 30 - 40mph, 50 - 60km/h in 3rd gear or "D" range and hold throttle valve at that opening position for 1 min.
4. Stop vehicle.
5. Check DTC in "DTC" mode and pending DTC in "ON BOARD TEST" or "PENDING DTC" mode.





INSPECTION