Toyota

Have Toyota Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Toyota
This answer was rated:

I am having a what started out as a speedometer issue with…

Hello,I am having a what...
Hello,I am having a what started out as a speedometer issue with my vehicle.I have a 1996 4runner 2WD w/ ABS.A few weeks ago I made a short trip to the store, then after starting the vehicle and leaving I noticed the speedometer was not working. All other gauges are working as normal. A few minutes later a P0500 CEL was generated. I researched this as the "Vehicle speed sensor malfunction" and tried some of the procedures in the FSM to resolve it. The only speed sensor I have found is on the transmission labelled as the "No. 2 Vehicle speed sensor". I cleaned the electrical connection to it and tested the resistance to be within spec. After I cleaned it the CEL went away immediately and then returned a day later. After reading more about it I determined that this speed sensor was more for the ECU to determine proper gear shifting and not so much for speedometer function.Next I turned my attention to the ABS since the dash light has been illuminated since I bought it due to a severed right front ABS wire. Many people have told me that this vehicle gets speed info from the ABS and not a lone speed sensor. I tried pulling ABS codes by jumping the Tc + E1 terminals in the diagnostic port and I get no ABS light, and the cruise control light and airbag lights flash continuously. I read a post where a someone had a similar issue and found it to be a short in the Tc circuit since that circuit connect the ABS ecu, Cruise control ecu, and the Airbag sensor assembly. That post did not contain any details on where they had the problem. I have inspected as much of that circuit as possible and tested continuity between the Abs ecu and the Tc terminal as well and the cruise control and the Tc terminal. I haven't found anything wrong with the Tc circuit and its driving me a little nuts. Some have suggested replacing the ABS ecu but I want to make sure that's the problem before replacing it. And lastly I have cleaned every ground I can get my hands on.
Show More
Show Less
Ask Your Own Toyota Question
Customer reply replied 4 months ago
Here is a youtube video I took of the flashing dash lights. https://youtu.be/J2xX0b1Xncs
Answered in 1 day by:
10/14/2017
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4,549
Experience: Toyota Master Tech, ASE Certified
Verified

Thanks for posting

There is actually another speed sensor (speed sensor#1) it is built into the speedometer, the computer receives a square wave input signal from it, if this signal is missing or corrupted the speedo does not send the required info to the ECM and this turns the light on. The speedo assembly is replaceable by itself. You may want to consider taking it to a shop that can read live data for the speed sensor to the ECM, if there is no signal replace the speedo assembly. This condition will also cause the abs and skid control systems to stop functioning or at least turn those lights on as well.

Ask Your Own Toyota Question
Customer reply replied 4 months ago
Thanks for replying. Square wave data is not really an option where I live. Even if the speedo is malfunctioning, shouldn't I still be able to pull ABS codes? Is there anything I can do to the speedo itself?

Thanks for the reply, it would seem that there should be some codes in the ABS/skid control system, is the check engine light on now, can you get any codes for it?

Check the speed sensor on the transmission, remove it and attach a voltmeter across the two electrical terminals, pass a metal object like a screwdriver back and forth about 1/8" from the magnet of the sensor, this should produce a small voltage variation of between zero and .5 volts. If this is ok the problem is the speedo or the computer.

Ask Your Own Toyota Question
Customer reply replied 4 months ago
I have a broken abs wire on the front right wheel. I always have an abs code stored for that. This weird problem with the diagnostic port is causing the abs light to go out instead of reporting abs codes and flash those other lights when jumping the Tc + e1 terminals. Is there a more ABS specific terminal I could jump with E1? Im pretty sure I should still be able to pull abs codes even if the speedo has died. The only CEO codes I have are the P0500 for the No.2 speed sensor.

O​k, I'm going to check what the terminals are to get abs codes.

Ask Your Own Toyota Question

Try jumping between TC and CG in the check connector (DLC3) at left side dash.

I think it may be a good idea to fix that broken wire or the wheel speed sensor, if the wire is plugged on with a connector you can just replace the wire,

Ask Your Own Toyota Question
Customer reply replied 4 months ago
Ted, this rabbit hole just gets deeper.
I tried jumping the TC and CG terminals on the OBDII port only to find that there is nothing on the CG terminal for my vehicle. That said, I also tried to pull CEL codes this morning to confirm the P0500. I am getting no power at the OBDII port for my blue tooth reader. Which is strange because it was working normal yesterday. I use it everyday with my torque pro app to monitor coolant temperature and rpms etc. It won't even power up today.
Customer reply replied 4 months ago
Well I think I was wrong about the OBD port. I think the terminal are just really wide and allowed my paper clip to go all the way through. In any event it blew the 7.5A OBD fuse. I will look at the codes again as soon as I get another fuse. I definitely wont be jumping those two terminals again.

O​k, with the new fuse in and if the reader can get abs codes you should be getting something because that wire on one of the sensors is broken, That may be all that's wrong with it since the computer also gets wheel speed information for traction control/abs in conjunction with the transmission speed sensor.

Ask Your Own Toyota Question
Customer reply replied 4 months ago
I have the BAFX OBDII reader and it does not read ABS codes. I have had an active abs code since purchase of the vehicle and never had a problem with the speedometer or jumping abs codes from the diagnotic port in the engine bay. I did replace the fuse and immediately retrieved the p0500 CEL.I tried unplugging the cruise control then jumping the Tc e1 terminals. The cruise light does not illuminate, the airbag continues to flash constantly. This tells me disconnected components simply don't show on the dash when jumping the Tc e1. That is why I originally thought there was a wiring problem between the ABS ecu and the Tc terminal in the diagnostic port but the continuity checks and I have not been able to access the entire length of the wire. So my main focus has been "why does the abs light not show up during Tc e1 jumping?". I'm curious if the wire is grounding out somewhere along it's length.I apologize for rambling. I do appreciate your help. I may not be able to do much until tomorrow.

No problem, does the abs/skid control light turn on when the key is turned on and then go off after starting?

Ask Your Own Toyota Question
Customer reply replied 4 months ago
The ABS stays illuminated at all times. The only time it goes out is when jumping the Tc e1.

It goes out and the others start blinking( cruise control, vsc etc? If that's the case you have the right terminals connected, could be an open circuit between the abs computer or the computer itself, the computer causes the light to blink when it's jumped like this or it stays on when there is a fault detected after the engine starts. There may be a short to ground in the wire from the light to the computer or the abs computer has the problem. From jumping the TC and E1 the computer should enter diagnostic mode, it sounds like that's not happening. You may end up replacing the abs computer which is not uncommon on these models.

Ask Your Own Toyota Question
Customer reply replied 4 months ago
that is my current theory. This model does not have VSC but the later 01 and 02 models do. I just don't even know how the ABS ecu could have died. The ABS system has never functioned due to the broken sensor wire. I guess I can open it up to see if I get lucky and stumble upon a blown capacitor.
Customer reply replied 4 months ago
Although I suppose the Speed sensor could be broken as well but I will test it before making that determination.

T​hat doesn't look good, anyway, there you go looks like moisture got in there and caused corrosion.

Ask Your Own Toyota Question
Customer reply replied 4 months ago
Its possible but I believe the 100uf 50v capacitor in that spot ejected its guts all over the place. I had the exact same thing happen to the main ECU almost a year ago. Plus I can see that the bottom end cap has broken open. This tropical environment is hell on the electronics. It will be a while before I can get a replacement part out here to the island. Thank you for letting me bounce around ridiculous ideas about shorted wires.

You're very welcome and please take a moment to rate my help positively, thanks and best of luck.

Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4,549
Experience: Toyota Master Tech, ASE Certified
Verified
Ted Ritter and 87 other Toyota Specialists are ready to help you
Ask your own question now
Was this answer helpful?
Ask Ted Ritter Your Own Question
Ted Ritter
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4,549
4,549 Satisfied Customers
Experience: Toyota Master Tech, ASE Certified

Ted Ritter is online now

A new question is answered every 9 seconds

How JustAnswer works:

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

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!

JugheadUSA

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!!!!

AlexLos 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.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, 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.

EstherWoodstock, 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.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Chris (aka-Moose)

Chris (aka-Moose)

Auto Technician

1,001 satisfied customers

16 years of experience

Marty

Marty

ASE Certified Technician

180 satisfied customers

ASE & Bosch Master Tech. 30 years experience.

Amedee

Amedee

Toyota Technician

1,229 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Anthony

Anthony

ASE Certified Technician

401 satisfied customers

ASE Master Automobile Technician with over 20 years exp. in this field.

Richard

Richard

ASE Certified Technician

9 satisfied customers

Toyota tech. ASE Certified Technician

Skyvisions

Skyvisions

ASE Certified Technician

12,737 satisfied customers

Toyota Master Diagnostic

Genchi Genbutsu

Genchi Genbutsu

Toyota Master Technician

3,761 satisfied customers

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

< Previous | Next >

Related Toyota Questions
The brake, master, check engine, navigation system and VFC
The brake, master, check engine, navigation system and VFC warning lights all came on this morning. I just had it in the shop for some unrelated collision repair work and though maybe the codes needed… read more
Mechanic01
Mechanic01
2,021 satisfied customers
The oil lamp flickers, goes on and off. The check engine
The oil lamp flickers, goes on and off. The check engine light came on, ran the code for it, retarded cam shaft timing … read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
The engine is making a ticking/rattling noise upon
Hello ... The engine is making a ticking/rattling noise upon acceleration. It eventually goes away until I have to accelerate again. It has only been doing this for a few days. It has never been in an… read more
Mechanic01
Mechanic01
2,021 satisfied customers
Overheating idincator light is on, engine when checked was
overheating idincator light is on, engine when checked was very hot, also noticed red fluid under the car … read more
Kevin
Kevin
workshop foreman /master tech/mot tester
0 satisfied customers
I have a 08 highlander hybrid, the problem is the engine is
Hi there, I have a 08 highlander hybrid, the problem is the engine is not shutting off when slowing down or when stopped at a stop light. The battery has a good charge according to the dash readout, n… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
The Vsc, TRAC OFF, and Engine light is on solid. NO and NO
Hi, the Vsc, TRAC OFF, and Engine light is on solid. … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
2 satisfied customers
Check VSC System along with traction,engine, and triangle
Check VSC System along with traction,engine, and amber triangle lights are on … read more
Todd M
Todd M
Owner
ASE Certification
1,592 satisfied customers
The car will turn on but the engine won't start. What's does
It also won't turn all the way off and let me pull out the key … read more
Danny
Danny
Owner, lead mechanic
High School or GED
3,963 satisfied customers
Engine starts but it takes way to much energy to start it,
engine starts but it takes way to much energy to start it, drains the battery pretty quickly. … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
The vehicle came in with a up engine. We replaced the engine
The vehicle came in with a blown up engine. We replaced the engine and now throttle only works with the pedal haft way down due to code P1126. We tried another throttle body but the code is the same. … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
1,041 satisfied customers
VSC light is on and check engine is on what could cause
VSC light is on and check engine is on what could cause this … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
2 satisfied customers
The check engine light came on for about 10 minutes then
The check engine light came on for about 10 minutes then went back off it has never done this before! … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
2 satisfied customers
Check engine light with VSC light on - code was oxygen
check engine light with VSC light on - code was oxygen sensor shop said the oxygen sensor was fine as was the other air sensor … read more
Ted Ritter
Ted Ritter
Toyota Master Tech
4,549 satisfied customers
Check engine light on 2010 Prius, On steady. It's extremely
On steady. It's extremely cold here, and the engine has been knocking badly when first started. Then it knocked at stoplights. Then the light came on. … read more
Ted Ritter
Ted Ritter
Toyota Master Tech
4,549 satisfied customers
Engine starts warms up, drives well, at random engine turns
Engine starts warms up , drives well , at random engine turns off as if key was turned off , one of the main relays in center dash has power when key is off right after engine dies , will not restart … read more
Ted Ritter
Ted Ritter
Toyota Master Tech
4,549 satisfied customers
It's shaking and check engine light is on. It was blinking
It's shaking and check engine light is on JA: Does the light stay on, or does it blink? Customer: It was blinking yesterday and now it stays on JA: What is the model/year of your Toyota? Customer: 200… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Gunned the engine passing at 40mph and had 'check engine,
gunned the engine passing at 40mph and had 'check engine, light come on with 'traction control' light, and 'inspect hybrid system' warning message on the dash along with master triangle exclamation ic… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
Check engine light is flashing, trac off on, and engine
check engine light is flashing, trac off on, and engine shuddering. thanks … read more
Gunvir Singh
Gunvir Singh
1,891 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x