Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Shift Control
The PCM instantly determines which gear should be selected by various signals sent from the sensors and the switches, and it actuates shift solenoid valves A, B, C, D, and E to control gear selection.
The shift solenoid valves are a normally closed type valves. The shift solenoid valve opens the port of the shift solenoid valve pressure leading to the shift valves, while the shift solenoid valve is turned ON by the PCM, and closes the port when the shift solenoid valve is OFF.
The combination of driving signals to shift solenoid valves A, B, C, D, and E are shown in the table.
| Position | Gear position | Shift solenoid valves | ||||
|---|---|---|---|---|---|---|
| A | B | C | D | E | ||
| D | Shifting from N | OFF | ON | ON | OFF | OFF |
| Stays in 1st | ON | ON | ON | OFF | OFF | |
| Shifting gears between 1st and 2nd | OFF | ON | ON | OFF | OFF | |
| Stays in 2nd | OFF | ON | OFF | ON | OFF or ON | |
| Shifting gears between 2nd and 3rd | OFF | ON | ON | ON | OFF or ON | |
| Stays in 3rd | OFF | OFF | ON | OFF | OFF or ON | |
| Shifting gears between 3rd and 4th | OFF | OFF | OFF | OFF | OFF or ON | |
| Stays in 4th | ON | OFF | OFF | OFF | OFF or ON | |
| Shifting gears between 4th and 5th | ON | OFF | OFF | ON | OFF or ON | |
| Stays in 5th | ON | OFF | ON | ON | OFF or ON | |
| 2 | 2nd gear | OFF | ON | OFF | ON | OFF |
| 1 | 1st gear | ON | ON | ON | OFF | OFF |
| R | Shifting from P and N | OFF | ON | OFF | OFF | ON |
| Stays in reverse | ON | ON | OFF | OFF | ON | |
| Reverse inhibit | OFF | OFF | ON | OFF | OFF | |
| P | Park | OFF | ON | OFF | OFF | ON |
| N | Neutral | OFF | ON | ON | OFF | OFF |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.