- The counter gear speed is determined based on the signals from the skid control ECU (speed sensor signals).
- Shifting between 1st to 4th gears is allowed.
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VILF |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: U660E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: FAIL-SAFE CHART; 2016 MY Sienna [12/2015 - 08/2016] | ||
FAIL-SAFE CHART
1. Fail-safe
This function minimizes the loss of operation when any abnormality occurs in a sensor or solenoid.
Fail-safe Control List
|
Malfunction Part |
Function |
|---|---|
|
Input Speed Sensor (NT) |
Shifting to only either 1st or 3rd gears is allowed. |
|
Output Speed Sensor (NC) |
|
|
ATF Temperature Sensor |
Shifting between 1st to 4th gears is allowed. |
|
ECT ECU Power Supply (Voltage is Low) |
When the vehicle is being driven in 6th gear, the transaxle is fixed in 6th gear. When being driven in any of 1st to 5th gears, the transaxle is fixed in 5th gear. |
|
CAN communication |
Shifting to only either 1st or 3rd gears is allowed. |
|
Knock Sensor |
Shifting between 1st to 4th gears is allowed. |
|
Solenoid Valve SL1, SL2, SL3 and SL4 |
The current to the failed solenoid valve is cut off and operating the other solenoid valves with normal operation performs shift control. (Shift controls in fail-safe mode are described in the table on the next page. For details, refer to Fail-Safe Control Chart) |
Solenoid Valve Operation when Normal
|
Gear |
1st |
2nd |
3rd |
4th |
5th |
6th |
|
|---|---|---|---|---|---|---|---|
|
Solenoid |
SL1 |
ON |
ON |
ON |
ON |
OFF |
OFF |
|
SL2 |
OFF |
OFF |
OFF |
ON |
ON |
ON |
|
|
SL3 |
OFF |
ON |
OFF |
OFF |
OFF |
ON |
|
|
SL4 |
OFF |
OFF |
ON |
OFF |
ON |
OFF |
|
Fail-safe Control Chart
|
Gear in Normal Conditions |
1st |
2nd |
3rd |
4th |
5th |
6th |
|
|---|---|---|---|---|---|---|---|
|
SL1 |
ON Malfunction (without Fail-safe Control)*1 |
1st |
2nd |
3rd |
4th |
4th |
4th |
|
OFF Malfunction (without Fail-safe Control) |
1st to N |
2nd to N |
3rd to N |
4th to N |
5th |
6th |
|
|
Fail-safe Control during OFF Malfunction |
Fixed in 3rd or 5th |
||||||
|
SL2 |
ON Malfunction (without Fail-safe Control)*1 |
1st to 4th |
2nd to 4th |
3rd to 4th |
4th |
5th |
6th |
|
OFF Malfunction (without Fail-safe Control) |
1st |
2nd |
3rd |
4th to 1st |
5th to N |
6th to N |
|
|
Fail-safe Control during OFF Malfunction |
Fixed in 2nd or 3rd |
||||||
|
SL3 |
ON Malfunction (without Fail-safe Control)*1 |
1st to 2nd |
2nd |
3rd |
4th |
5th |
6th |
|
OFF Malfunction (without Fail-safe Control) |
1st |
2nd to 1st |
3rd |
4th |
5th |
6th to N |
|
|
Fail-safe Control during OFF Malfunction |
Fixed in 3rd |
||||||
|
SL4 |
ON Malfunction (without Fail-safe Control)*1 |
3rd |
3rd |
3rd |
4th |
5th |
5th |
|
OFF Malfunction (without Fail-safe Control) |
1st |
2nd |
3rd to 1st |
4th |
5th to N |
6th |
|
|
Fail-safe Control during OFF Malfunction |
Fixed in 2nd |
||||||
*1: Fail-safe control is not activated when an ON malfunction occurs.
|
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