System Description
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
The ECM uses signals from the vehicle speed sensor and input / turbine speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear). The ECM then compares the actual gear with the shift schedule in the ECM memory to detect mechanical trouble of the shift solenoid valves, valve body and automatic transmission (clutch, brake or gear etc.).
DTC CONDITION DETECTION CHART
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| P0751 | The gear required by the ECM does not match the actual gear when driving (2-trip detection logic) |
|
| P0756 |
|
|
| P0761 |
|