How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ted Ritter Your Own Question

Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 3341
Experience:  Toyota Master Tech, ASE Certified
1279120
Type Your Toyota Question Here...
Ted Ritter is online now
A new question is answered every 9 seconds

Toyota Pickup: I have a 94 Toyota 4WD 4 cyl. pickup, engine

Customer Question

I have a 94 Toyota 4WD 4 cyl. pickup, engine will crank, but not fire. I have replaced the fuel filter, removed the fuel tank, checked fuel pump (ran wires directly from battery, runs just fine) checked tank, (thought is was dirty/rusty, V.clean)replaced tank. New battery, I do not have power running back to fuel pump, also checked connector under seat in cab, no power there either, (with ignition on) any suggestions?
Submitted: 2 years ago.
Category: Toyota
Expert:  Ted Ritter replied 2 years ago.

hello, the fuel pump does not run with just the key on, it should run as soon as the computer receives a start signal when the engine is cranking, once there is ignition confirmation the circuit opening relay will trigger the fuel pump to stay on.

locate the diagnostic check connector under the hood, turn the key on and put a jumper wire between the terminals B+ and FP, this will activate the fuel pump bypassing all the relays and the computer, let me know the result of this test.

Customer: replied 2 years ago.
Tried that, bridge wire,+B,FP, still wont start
Expert:  Ted Ritter replied 2 years ago.
Thanks for the reply, do you have 12 volts at the B+ terminal of the connector?
Customer: replied 2 years ago.
No. I have a multimeter, and a continuity tester, nothing on either. How far down in the diagnostic box should I have to push to make contact?
Expert:  Ted Ritter replied 2 years ago.
The metal pin connector is just below the top surface, you may have to clean it of grease to make sure you are connected to the metal connector,if there is no voltage to B+ the fuel pump won't run.
Customer: replied 2 years ago.
Just re-tested, key on this time. (my bad) I have voltage
Expert:  Ted Ritter replied 2 years ago.
No problem, if the fuel pump doesn't run when jumping B+ and FP then there is an open wire. Check for continuity between the FP terminal and the fuel pump wire under the seat, if it's ok check from the connector to the wire on the fuel pump at the tank.
Customer: replied 2 years ago.
Okay. Is that the blue wire? and with the key on?
Expert:  Ted Ritter replied 2 years ago.
Yes that would be the blue wire, do you have a fuel pump circuit diagram?
Customer: replied 2 years ago.

Okay, I think Im on to something. Checked continuity from FP to connector under seat , no current. I ran a " bridge wire" from FP (still hooked to +B) to connector , fuel pump runs, engine starts, then quits

Expert:  Ted Ritter replied 2 years ago.
Ok, how long does the engine run?
Customer: replied 2 years ago.

Runs for a few seconds

Expert:  Ted Ritter replied 2 years ago.
Check the airflow meter connector, check to make sure there are no large vacuum leaks, do you have a fuel pressure gauge, the fuel pump should keep running like this but I want to be sure it's not losing pressure after starting up.
Customer: replied 2 years ago.

Checked all the trunking/hoses running from airflow meter(on top of air filter?) across to intake manifold, they appear intact. I do not have a fuel pressure gauge. Where is the Schraeder valve/ connection for the gauge located on the fuel system?

Expert:  Ted Ritter replied 2 years ago.
There is no valve, you would have to open the fuel rail fitting and use a banjo adapter or connect at the cold start injector, most autoparts stores have tool rentals available so you could rent a gauge with the necessary fittings.
Customer: replied 2 years ago.
Okay. It is almost dark here, and it will be Tuesday of next week before I will be able to try that. What are your usual hours? I would like to continue working with you. In the meantime, I could use some help locating the fuel rail fitting ,and the cold start injector. I have a Haynes manual ,sometimes the pictures/ discriptions/diagrams are a little vague, especially when one manual covers several years and models
Expert:  Ted Ritter replied 2 years ago.
The easiest way is to connect to the cold start injector, it's located on the outer side of the plenum chamber and has a small fuel line going to it and an electrical connector on it. Just remove the 12mm fitting and put a suitable banjo fitting and a longer 12mm fitting.
Expert:  Ted Ritter replied 2 years ago.
I'm usually on line from about 10AM to 8PM PST off and on.
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 3341
Experience: Toyota Master Tech, ASE Certified
Ted Ritter and other Toyota Specialists are ready to help you
Customer: replied 2 years ago.
Read your E-mail today,when I got home, will be contacting you tomorrow, (4/18) to continue working on my 94 toyota. Picked up a fuel pressure tester today, will hook it up in the morning, and go from there.
Expert:  Ted Ritter replied 2 years ago.
Ok, I will check back later today.
Customer: replied 2 years ago.
Some success this morning! With just brdge wire from B+ Fp truck runs, runs unsteadily, and dies ( no fuel pressure) With jumper wire from B+ Fp to connector under passenger seat, engine will run continuously (Fuel pressure maintians a constant 38psi when running, or engine stopped, raising slightly when engine RPM is increased,dropping back to 38psi)
Customer: replied 2 years ago.
Relist: Other.
ted ritter may be busy, is skyvisions available?
Customer: replied 2 years ago.
Relist: Other.
No response from technician
Expert:  Ted Ritter replied 2 years ago.
Sorry, I was not available to reply sooner, I think there may be a problem with either the EFI relay or the circuit opening relay. Try switching the efi relay with another relay that is the same, if that doesn't work locate the circuit opening relay and replace it.
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 3341
Experience: Toyota Master Tech, ASE Certified
Ted Ritter and other Toyota Specialists are ready to help you
Customer: replied 2 years ago.
Okay. May need help locating them. Is the fuel pressure Okay? (38PSI)
Expert:  Ted Ritter replied 2 years ago.
Yes the fuel pressure is ok, the problem may be the efi relay it's located in the fuse box under the hood, the circuit opening relay is located under the right side kick panel, this picture may help locate it.

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here
View Full Image

Attachments are only available to registered users.

Register Here
Customer: replied 2 years ago.
Switched the EFI relay with the one marked "starter" no change. Removed the panel in R/H kick plate, only thing there, is a large metal box, about 7 inches square, marked "ENGINE CONTROL"
Customer: replied 2 years ago.
I located the cicuit opening relay, by removing the glovebox. It has 5 prongs on it, 3 smaller ones in a row, with 2 bigger ones below. Is this correct?
Customer: replied 2 years ago.
Will continue in the A.M. Are you available tomorrow, Friday?
Expert:  Ted Ritter replied 2 years ago.
yes that is the correct relay.
Expert:  Ted Ritter replied 2 years ago.
I will be back later this afternoon.
Customer: replied 2 years ago.
Have located correct relay (there were two) However, there is no power coming into the relay. According to my wiring diagram, there are two feeds, b/w,black & white larger wire,) & w/b,( black on white,smaller wire). Both are marked as B (black) on the diagram. As a result, I am unable to make blue wire(L) hot, pump will still only run, (&engine) with jumper wire installed, from B+ to connector, under seat. Also, no continuity from +B to Fp on diagnostic box. I'm curious, what exactly are we bypassing, using the jumper wire?
Customer: replied 2 years ago.
Are you available tomorrow (Saturday?)
Expert:  Ted Ritter replied 2 years ago.

Hello, I'm available most of today. Thank you for being patient. When you are using the fp/b+ jumper You are bypassing the relays including the circuit opening and the efi relay. When powering the blue wire under the seat you are bypassing the relays and there associated wiring so the problem has to be foreward from the connector under the seat. there is no continuity from b+to fp this is normal.

I'm going to locate my wiring diagram and we can go from there to find where the open circuit or bad relay may be, I'll be back shortly.

Expert:  Ted Ritter replied 2 years ago.

Hello, with the key on is there voltage to the black/orange wire to the COR?

When cranking the engine is there voltage to the blue wire at the COR?

Customer: replied 2 years ago.
Thanks for replying, I appreciate your help. Okay, with B+/Fp bridge installed, blue wire is hot with key on, and when cranking. Remove bridge, nothing. Cannot locate black/orange, here's what I have; Looking at the back of the relay, top row L toR; black/white(big wire},white/red, blue,(fuel pump) .Bottom row; Lower left, white/black, lower right, green yellow
Expert:  Ted Ritter replied 2 years ago.
Is it a manual transmission, it sounds like either the starter relay or the airflow meter is the problem. Do you have the information how to test the air flow meter?
Expert:  Ted Ritter replied 2 years ago.
It could still be a problem with the circuit opening relay itself. Have you tried replacing it?
Expert:  Ted Ritter replied 2 years ago.

The black/white wire is the starter signal wire

blue goes to the pump

white/black is ground solid black is B+

green yellow is FC (fuel cut) and goes to the air flow meter

these are for the circuit opening relay you mentioned earlier

 

Check for starter signal voltage when cranking

check for voltage to the blu wire when cranking

check for ground to the white black wire

if those are ok, ground the green/white wire, if the engine start and runs the problem is the contact in the airflow meter

If it doesn't start or any of the above tests are negative replace the circuit opening relay.

Customer: replied 2 years ago.
Thankyou for replying; I have a Haynes manual which describes in great detail how to test the airflow meter (the only problem there is understanding the graduations on my multimeter versus the manual!!!) will check everything else. Do I undertake these tests with/without the wire bridge (B+ Fp)?
Expert:  Ted Ritter replied 2 years ago.
No, do not use the B to fp jumper when testing.
Customer: replied 2 years ago.
Ran tests, B/W hot while cranking, W/R hot while ingition is on, and cranking, nothing on blue (pump) wire, grounded W/B wire, nothing. Grounded green/yellow wire nothing. At no time did I hear an audible "click" from the relay. New relay is 72 dollars, just wanted to make sure. Also, using a Multimeter,I checked resistance across STA-E1 (17-25) and B+-Fc (88-132) came up with the same measurement for both, which was 3, on the scale(Ohms) Based on the parameters, both tests should have come up with different readings, shouldn't they?
Expert:  Ted Ritter replied 2 years ago.
Ok, it sounds like the relay is the problem.
Customer: replied 2 years ago.
Okay, may take until Monday to get one (NAPA carries it.)Thanks again. Will be in touch maybe tomorrow, or Monday, hope this fixes it.
Expert:  Ted Ritter replied 2 years ago.
Ok keep me posted.
Customer: replied 2 years ago.
Update; Unable to get relay until Monday/Tuesday time frame. However, by using jumper wire from white/red hot wire in relay plug to blue fuel pump wire in relay plug (bypassing circuit opening relay altogether) truck runs great. Took truck on 5-10 mile test run, no missing, hesitating etc,leading me to think the rest of the fuel/ingition system is ok. What do you think?
Expert:  Ted Ritter replied 2 years ago.
Great, looks like you found the problem.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU! Jughead USA
< Last | Next >
  • THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU! Jughead USA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Auto Technician

    Satisfied Customers:

    278
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Auto Technician

    Satisfied Customers:

    278
    16 years of experience
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    ASE Certified Technician

    Satisfied Customers:

    167
    ASE & Bosch Master Tech. 30 years experience.
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    Toyota Technician

    Satisfied Customers:

    1132
    ASE Master Technician advanced level specialist. Wisconsin certified emissions state inspector
  • http://ww2.justanswer.com/uploads/CA/caprio23/2014-4-30_201741_20121205122939.64x64.jpg Anthony's Avatar

    Anthony

    ASE Certified Technician

    Satisfied Customers:

    373
    ASE Master Automobile Technician with over 20 years exp. in this field.
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    9
    Toyota tech. ASE Certified Technician
  • http://ww2.justanswer.com/uploads/SK/skyvisions/2012-6-9_23736_JACropped3.64x64.jpg Skyvisions's Avatar

    Skyvisions

    ASE Certified Technician

    Satisfied Customers:

    11403
    Toyota Master Diagnostic
  • http://ww2.justanswer.com/uploads/genchigenbutsu/2009-05-09_003043_cimg16431.jpg Genchi Genbutsu's Avatar

    Genchi Genbutsu

    Toyota Master Technician

    Satisfied Customers:

    3425
    Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine