Overdrive Ratio

Overdrive Ratio Error Circuit:

The overdrive ratio is determined from input speed and engine speed.

When TCC is engaged in 4th gear, if there is more than a 200 rpm difference between engine speed and input speed for at least two seconds, code 68 will set.

While code 68 is set, the following fail-safe actions will be taken:
- Inhibit 4th Gear
- Inhibit TCC Operation
- Use Default Value for Pressure (force motor duty cycle)
- Assume Drive 4 Shift Pattern

The system will recover on the next ignition cycle.