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Trans_ Service
Trans_ Service, ..................
Category: Transmissions
Satisfied Customers: 4944
Experience:  .................
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Ok, Last May I put a trailer on my truck it driving to and a

Customer Question

JA: What is the make/model/year of your car?
Customer: Last May I put a trailer on my truck it driving to hill and a little snowy I push*****and after that the light keep flishing
JA: Just to clarify, can you tell me which light it is? And does it blink first, then stay on steady?
Customer: The hi light keep flashing
JA: What year is your Toyota?
Customer: 2002
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: 2002 Tundra
JA: Anything else you want the mechanic to know before I connect you?
Customer: And also the engine light keep flashing we used the machine check it gone for running a few minutes start again
Submitted: 10 months ago.
Category: Transmissions
Expert:  Trans_ Service replied 10 months ago.

Hello. Welcome to Just Answer. Please allow me to assist you. The 4WD HI light flashing indicates that the system is not completing the necessary sequence to engage the 4WD. Thsi is most commonly caused by a faulty front axle disconnect unit. The system works as follows:

engage 4wd

computer sends signal to front axle disconnect unit

disconnect unit energizes and connects the front axle

The disconnect device sends a signal to the computer indicating that the connection is made

The computer sends a signal to the transfer case shift motor to engage 4WD.

The shift motor moves to engage 4WD

If the light flashes, this indicates that the front axle disconnect unit did not send the "connection completed' signal to the computer.

Experience here: we usually replace the front axle disconnect unit to cure this.

Expert:  Trans_ Service replied 10 months ago.

Please confirm you have received my input; thanks