Toyota Venza: Fail-safe Chart

Toyota Venza Service Manual / U660e Automatic Transmission / Transaxle / Automatic Transaxle System / Fail-safe Chart

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 Turbine Speed Sensor	Shifting to only either 1st or 3rd gears is allowed.
Counter Gear Speed Sensor	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.
ATF Temp. 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 actuated when an ON malfunction occurs.

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