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Toyota Sequoia (2005). Manual - part 193
DIDJ2–01
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DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–567
761
FAIL–SAFE CHART
1.
FAIL–SAFE
This function minimizes the loss of the ECT functions when any malfunction occurs in a sensor or solenoid.
Malfunction Part
Function
Output Speed Sensor (SP2)
During an output speed sensor malfunction, shift control is effected through the
input speed sensor signal (NT).
ATF Temp. Sensor No. 1
During an ATF temperature sensor No. 1 malfunction, up–shift to the 5th and flex
lock–up clutch control are prohibited.
Shift Solenoid Valve S1, S2 and SR
The current to the failed solenoid valve is cut off and control is effected by operating
the other solenoid valves with normal operation.
Shift control is effected depending on the failed solenoid as described in the table
on the next page.
Shift Solenoid Valve SL1 and SL2
During a solenoid valve SL1 or SL2 malfunction, up–shift to the 5th is prohibited.
Shift Solenoid Valve SLU
During a solenoid valve SLU malfunction, the current to the solenoid valve is
stopped. This stops lock–up control and flex lock–up control, fuel economy de-
creases.
Shift Solenoid Valve SLT
During a solenoid valve SLT malfunction, the current to the solenoid valve is
stopped. This stops line pressure optimal control, the shift shock increases. How-
ever, shifting is effected through normal clutch pressure control.
Fail Safe Function:
If either of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoid
”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 current to the short circuited solenoid.
Even if starting the engine again in the fail–safe mode, the gear position remains in the same position.