The transmission's fluid pressure sensor (Sensor E) isn't sending the right signal to the engine computer, like a broken gauge that can't tell you if your tire pressure is correct. This prevents the transmission from adjusting properly and can cause shifting problems.
The ECM monitors voltage/resistance output from transmission fluid pressure sensor E to verify hydraulic pressure levels in real-time. The sensor should produce a varying signal proportional to fluid pressure, and the ECM compares this against expected pressure maps for current engine load and gear selection.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage Output | 0.5–4.5 volts (varies with pressure) | Below 0.1V or above 4.9V, or no signal |
| Fluid Pressure (logical) | 20–300+ psi depending on gear | Pressure reading implausible or missing |