Toyota Tacoma (2015-2018) Service Manual: Fail-safe Chart

Toyota Tacoma (2015-2018) Service Manual / Ac60e Automatic Transmission / Transaxle / Automatic Transmission System(for 2tr-fe) / 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
Transmission revolution sensor (NT)	During a transmission revolution sensor (NT) malfunction, shift control is performed based on the transmission revolution sensor (SP2) signal.
Transmission revolution sensor (SP2)	During a transmission revolution sensor (SP2) malfunction, shift control is performed based on the wheel speed sensor signal.
ATF temperature sensors (No. 1 and No. 2)	During an ATF temperature sensor malfunction, up-shifting to 5th and 6th is prohibited.
Shift solenoid valve SL1, SL2, SL3 and SL4	Stop the conduction of electric power to a failed solenoid and shift gears by turning on/off normal solenoids. If all solenoids are malfunctioning, gears will be selected through mechanical hydraulic circuits.
Shift solenoid valve SLT	During a shift solenoid valve SLT malfunction, the current to the shift solenoid valve is stopped. However, shifting is performed through normal clutch pressure control.
Shift solenoid valve SLU	During a shift solenoid valve SLU malfunction, the current to the shift solenoid valve is stopped. This stops lock-up control, thus decreasing fuel economy.

Shift Solenoid Valve Operation when Normal

Gear Position	1st	2nd	3rd	4th	5th	6th
Shift solenoid valve SL1	ON	ON	ON	ON	OFF	OFF
Shift solenoid valve SL2	OFF	OFF	OFF	ON	ON	ON
Shift solenoid valve SL3	OFF	ON	OFF	OFF	OFF	ON
Shift solenoid valve SL4	OFF	OFF	ON	OFF	ON	OFF

Fail-safe Control Chart

Gear Position under Normal Conditions		1st	2nd	3rd	4th	5th	6th
Shift solenoid valve SL1	ON Malfunction (without Fail-safe Control)*	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
Shift solenoid valve SL2	ON Malfunction (without Fail-safe Control)*	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
Shift solenoid valve SL3	ON Malfunction (without Fail-safe Control)*	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
Shift solenoid valve SL4	ON Malfunction (without Fail-safe Control)*	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

*: Fail-safe control is not actuated when an ON malfunction occurs.

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Other materials:

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