Fail-Safe Chart

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

FAIL-SAFE CHART

Malfunction Item	Fail-safe Operation	Indicator light	Fail-safe Deactivation Conditions
4WD control ECU malfunction	2WD to 4WD HIGH switching is not possible 4WD HIGH to 4WD LOW switching is not possible	4HI indicator light and/or 4LO indicator light blink at 0.2 seconds intervals	Ignition switch OFF
Wheel speed signal malfunction1, 2	2WD to 4WD HIGH switching is not possible 4WD HIGH to 4WD LOW switching is not possible	4HI indicator light and/or 4LO indicator light blink at 0.2 seconds intervals	When signal returns to normal During 2WD switching operation Ignition switch OFF
A/T shift position signal malfunction	4WD HIGH to 4WD LOW switching is not possible	4LO indicator light blinks at 0.2 seconds intervals	When signal returns to normal During 2WD or 4WD HIGH switching operation Ignition switch OFF
Engine speed signal malfunction	4WD HIGH to 4WD LOW switching is not possible	4LO indicator light blinks at 0.2 seconds intervals
A.D.D. actuator limit switch malfunction	2WD to 4WD HIGH switching is not possible 4WD HIGH to 4WD LOW switching is not possible During cruise control AUTO driving, cruise control system is turned OFF	4HI indicator light blinks at 0.2 seconds intervals	Ignition switch OFF
2WD-4WD transfer shift actuator limit switch malfunction	2WD to 4WD HIGH switching is not possible 4WD HIGH to 4WD LOW switching is not possible During cruise control AUTO driving, cruise control system is turned OFF	4HI indicator light blinks at 0.2 seconds intervals
High-low transfer shift actuator limit switch malfunction	2WD to 4WD HIGH switching is not possible 4WD HIGH to 4WD LOW switching is not possible	4LO indicator light blinks at 0.2 seconds intervals
HINT: 1: When only 1 wheel's speed sensor is malfunctioning, the switching operation is performed based on the other 3 wheels. If the switch position and actuator match, fail-safe is deactivated. 2: When 2 wheels or more are malfunctioning, switching is not possible. If the speed sensor returns to normal, the fail-safe is deactivated. When the switching operation is performed during cruise control AUTO driving, if the switch completion does not occur 5 seconds after the switching operation, the cruise control system is turned off.