Circuit Description
The TP sensor is mounted on the throttle body and detects the throttle valve opening angle.
When the throttle valve is fully closed, the sensor transmits a signal voltage of approximately 0.3 to 1.0 V to terminal VTA of the ECM. This signal voltage increases in proportion to the opening angle of the throttle valve, reaching approximately 3.2 to 4.9 when the throttle valve is fully open.
The ECM determines the vehicle driving conditions from these signals and uses this information in functions such as air-fuel ratio correction, power increase correction and fuel-cut control.
DTC DETECTION CONDITIONS
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| P0120 | VTA less than 0.1 V, or VTA more than 4.9 V for 5 seconds or more (1 trip detection logic) |
|
| P0122 | VTA stays less than 0.1 V for 5 seconds or more (1 trip detection logic) |
|
| P0123 | VTA stays more than 4.9 V for 5 seconds or more (1 trip detection logic) |
|
HINT:
- Fail-safe mode: When any of these DTCs are set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts fuel intermittently. Fail-safe mode continues until a pass condition detected and the ignition switch is turned to OFF.
- When any of these DTCs are set, check the throttle valve opening angle using a hand-held tester or OBD II scan tool.
THROTTLE VALVE POSITION
| Throttle Valve Fully Closed | Throttle Valve Fully Open | Trouble Areas |
| 0% | 0% | VC circuit open VTA circuit open or short |
| Approximately 100 % | Approximately 100 % | E2 circuit open |