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rpmdiag, Tech and Instructor
Category: Toyota
Satisfied Customers: 8073
Experience:  Since 1975
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2007 tundra no start but turns over
, when you turn the

Customer Question

2007 tundra no start but turns over
JA: Thanks. Can you give me any more details about your issue?
Customer: when you turn the key on if the check engine light goes on it will start for a little bit then die then the 4lo light will flash and no check engine light
JA: OK got it. Last thing — Toyota Mechanics generally expect a deposit of about $20 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.
Category: Toyota
Expert:  rpmdiag replied 1 year ago.

Hi, I’m Ron and I can help you.
I have been in this business since 1975 and also teach automotive repair. I am confident we can resolve your problem together. Please understand that I don't know your skill level. I can't see, smell, hear, or touch the vehicle either, so it may take a few replies to get to satisfactory results. Please be patient!
I also try to give all of the information you may need, expecting a “positive rating” in return. I will also continue assisting you after you have rated me, if necessary. If there is any reason I cannot get a positive rating, please let me know why “in advance”, so I can go another direction for you. I am sorry you’re having this problem; I’ll help you through it.

This light is part of the computer system and tells us that if it does not come on that there is a malfunction with the computer itself. To be certain, you need to have a scan tool attached to the system checking for codes AND data that can be helpful in diagnosing this.

Thanks, Ron

Customer: replied 1 year ago.
I have a scan tool but all that comes up is no comm.
Expert:  rpmdiag replied 1 year ago.

Check for power and ground to the computer and out. Also check pin 16 for constant power. If it does have power in and out, then the computer is bad.

Thanks again, and please don't forget to rate me and keep this link in case you need ma again later on.


Customer: replied 1 year ago.
what color and pins are the power and grounds
Expert:  rpmdiag replied 1 year ago.

PIN 16 at the OBD connector is constant power and PINS 4 an 5 are chassis and computer grounds for the PCM.

Thanks again, and please don't forget to rate me and keep this link in case you need me again later on.