Summary of functions Use the front-wheel drive control switch to select the following transfer modes:
Shifting between "2WD" and "4H" ■ Shifting from "2WD" to "4H" 1. Reduce vehicle speed to less than 62 mph (100 km/h). 2. Turn the front-wheel drive control switch to "4H". The "4HI" indicator will come on. ■ Shifting from "4H" to "2WD" 1. Reduce vehicle speed to less than 62 mph (100 km/h). 2. Turn the front-wheel drive control switch to "2WD". The "4HI" indicator will go off. Shifting between "4H" and "4L" ■ Shifting from "4H" to "4L" 1. Stop the vehicle completely and continue to depress the brake pedal. 2. Shift the shift lever to N. 3. Push and turn the front-wheel drive control switch to "4L". The "4LO" indicator will come on. ■ Shifting from "4L" to "4H" 1. Stop the vehicle completely and continue to depress the brake pedal. 2. Shift the shift lever to N. 3. Push and turn the front-wheel drive control switch to "4H". The "4LO" indicator will go off. ■When the front-wheel drive control switch is shifted to "4L" VSC is automatically turned off. ■If the "4HI" indicator flashes The transfer mode may not successfully change. Drive straight ahead while accelerating or decelerating, or drive in reverse. ■If the "4LO" indicator continues to flash The transfer mode may not successfully change. Operate the front-wheel drive control switch again. ■If the "4LO" indicator continues to flash and a buzzer sounds The shift lever is not in N and/or the vehicle is moving. Stop the vehicle completely, shift the shift lever to N and make sure that the indicator stops flashing. ■If the "4HI" or "4LO" indicator flashes rapidly There may be a malfunction in the four-wheel drive system. Have the vehicle inspected by your Toyota dealer immediately. ■Four-wheel drive usage frequency You should drive in four-wheel drive for at least 10 miles (16 km) each month. This will assure that the front drive components are lubricated.
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Toyota Tundra Service Manual > Sfi System: Thermostat (P0128)
DESCRIPTION This DTC is stored when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time having elapsed. DTC No. DTC Detection Condition Trouble Area P0128 Conditions (a), (b) and (c) met for 5 seconds (2 trip detection logic): (a) Cold start (b) ...