Shift Control
The PCM instantly determines which gear should be selected by various signals sent from sensors and switches, and it actuates the shift solenoid valves A, B, C, and D to control gear selection
There are two types of shift solenoid valves
- Shift solenoid valves A and D are normally closed (ON-OPEN/OFF-CLOSE), The normally closed shift solenoid valve port open to allow ATF to pass through when the PCM turns it ON, and the port closes, blocking fluid flow when turned OFF
- Shift solenoid valves B and C are normally open (ON-CLOSE/OFF-OPEN), The normally closed shift solenoid valve port closes, blocking ATF from passing through when the PCM turns it ON, and the port opens, allowing fluid flow when turned OFF
The combination of driving signals to shift solenoid valves A, B, C, and D for each gear are in the following table
GEAR POSITION CHART
| Position | Gear Position | Shift Solenoid Valves | |||
|---|---|---|---|---|---|
| A | B | C | D | ||
| D and S | Shifting from N | OFF | ON | OFF | OFF |
| Stays in 1st | OFF | ON | ON | OFF | |
| Shifting gears between 1st and 2nd | ON | ON | ON | OFF or ON | |
| Stays in 2nd | ON | ON | OFF | OFF or ON | |
| Shifting gears between 2nd and 3rd | ON | ON | ON | OFF or ON | |
| Stays in 3rd | ON | OFF | ON | OFF or ON | |
| Shifting gears between 3rd and 4th | ON | OFF | OFF | OFF or ON | |
| Stays in 4th | OFF | OFF | OFF | OFF or ON | |
| D | Shifting gears between 4th and 5th | OFF | OFF | ON | OFF or ON |
| Stays in 5th | OFF | ON | ON | OFF or ON | |
| N | Neutral | OFF | ON | OFF | OFF |
| R | Shifting from P and N | OFF | ON | OFF | ON |
| Stays in reverse | ON | ON | OFF | ON | |
| Reverse inhibit control | OFF | ON | OFF | OFF | |
| P | Park | OFF | ON | OFF | ON |