FAIL-SAFE CHART
The fail-safe function minimizes the loss of ECT functions when a malfunction occurs in a sensor or solenoid.
Automatic Transaxle Fluid (ATF) temperature sensor:
When the ATF temperature sensor has a malfunction, up-shift to 4th gear is prohibited.
Counter gear speed sensor NC (Speed sensor NC):
When the counter gear speed sensor has a malfunction, up-shift to 4th gear is prohibited.
Shift solenoid valve DSL:
When the solenoid valve DSL has a malfunction, the current to the solenoid valve is stopped.
This stops lock-up control, and then fuel economy decreases.
Shift solenoid valve SL1, SL2 and S4:
If any of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid valves "ON" and "OFF" in order to shift into the gear positions shown in the table below.
In case of a short circuit, the ECM stops sending the current to the short-circuited solenoid.
| Normal | Shift Solenoid Valve SL1 | Shift Solenoid Valve SL2 | Shift Solenoid Valve S4 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear | Solenoid Valve | Gear | Solenoid Valve | Gear | Solenoid Valve | Gear | Solenoid Valve | ||||||||
| SL1 | SL2 | S4 | SL1 | SL2 | S4 | SL1 | SL2 | S4 | SL1 | SL2 | S4 | ||||
| 1st | ON | ON | OFF | 2nd | X | ON | OFF | 3rd | ON ↓ OFF |
X | OFF | 1st | ON | ON | X |
| 2nd | OFF | ON | OFF | 2nd | X | ON | OFF | 3rd | OFF | X | OFF | 2nd | OFF | ON | X |
| 3rd | OFF | OFF | OFF | 3rd | X | OFF ↓ ON |
OFF ↓ ON |
3rd | OFF | X | OFF | 3rd | OFF | OFF | X |
| 4th | OFF | OFF | ON | 3rd | X | OFF ↓ ON |
ON | 4th | OFF | X | ON | 3rd | OFF | OFF | X |
| Shift Solenoid Valve SL1 and SL2 | Shift Solenoid Valve SL1 and S4 | Shift Solenoid Valve SL2 and S4 | Shift Solenoid Valve SL1, SL2 and S4 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear | Solenoid Valve | Gear | Solenoid Valve | Gear | Solenoid Valve | Gear | Solenoid Valve | ||||||||
| SL1 | SL2 | S4 | SL1 | SL2 | S4 | SL1 | SL2 | S4 | SL1 | SL2 | S4 | ||||
| 3rd | X | X | OFF | 2nd | X | ON | X | 3rd | ON ↓ OFF |
X | X | 3rd | X | X | X |
| 3rd | X | X | OFF | 2nd | X | ON | X | 3rd | OFF | X | X | 3rd | X | X | X |
| 3rd | X | X | OFF | 2nd | X | OFF ↓ ON |
X | 3rd | OFF | X | X | 3rd | X | X | X |
| 4th | X | X | ON | 2nd | X | OFF ↓ ON |
X | 3rd | OFF | X | X | 3rd | X | X | X |
Tech Tips
↓: The condition during normal operation is shown above the "↓".
↓: The condition during fail-safe mode is shown beneath the "↓".