DTC P0751 Shift Solenoid "A" Performance (Shift Solenoid Valve S1): Description
WARNING: This page is about a different car, the 2008 Toyota Yaris. 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 speed sensor NT to detect the actual gear position (1st, 2nd, 3rd or 4th).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect the mechanical problems of the shift solenoid valves, the valve body or automatic transaxle (clutch, brake or gear etc.).
DTC DETECTION CONDITION CHART
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0751 | S1 stuck OFF malfunction *1: ECM determines there is malfunction when both of following conditions are met: (2-trip detection logic)
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| P0751 | S1 stuck ON malfunction*2: ECM determines that there is malfunction when both of following conditions are met: (2-trip detection logic)
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HINT:
Gear positions in the event of a solenoid valve mechanical problem:
GEAR POSITIONS
| Gearshift controlled by ECM | 1st | 2nd | 3rd | 4th |
| *1: Actual gear position under S1 stuck OFF malfunction | 4th | 3rd | 3rd | 4th |
| *2: Actual gear position under S1 stuck ON malfunction | 1st | 2nd | 2nd | 1st |