Automatic Transaxle System Fail-Safe Chart

Transmission. Camry. Acv40 Gsv40
U660E Automatic Transaxle. Camry. Acv40 Gsv40

  1. Fail-safe

Automatic Transaxle System -- Fail-Safe Chart



Fail-safe
This function minimizes the loss of operation when any abnormality occurs in a sensor or solenoid.
*1: Fail-safe control is not actuated when the ON malfunction occurs.
*2: Shifting to 5th and 6th gears is prohibited.

Fail-safe Control List
Malfunction Part
Function
Input Turbine Speed Sensor
Shifting to only either the 1st or 3rd gear is allowed.
Counter Gear Speed Sensor
  1. The counter gear speed is determined based on the signals from the skid control ECU (speed sensor signals).
  2. Shifting between 1st to 4th gears is allowed.
ATF Temp. Sensor
Shifting between 1st to 4th gears is allowed.
TCM
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 the 1st to 5th gears, the transaxle is fixed in 5th gear.
CAN Communication
Shifting to only either 1st or 3rd gear 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 Position
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 Position in Normal Operation
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
Fail-safe Control during OFF Malfunction (ATF Pressure Switches 1 and 2 Malfunctions)
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
1st
2nd
3rd
3rd
3rd
3rd
Fail-safe Control during OFF Malfunction (ATF Pressure Switches 1 and 2 Malfunctions)
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
1st
3rd
3rd
4th
5th
5th
Fail-safe Control during OFF Malfunction (ATF Pressure Switches 1 and 2 Malfunctions)
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
1st *2
2nd *2
4th*2
4th*2
6th
6th
Fail-safe Control during OFF Malfunction (ATF Pressure Switches 1 and 2 Malfunctions)
Fixed in 2nd