Toyota

Have Toyota Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

01 Tacoma hit a bump and blew many fuses. Replaced all and…

Customer Question
01 Tacoma hit a...

01 Tacoma hit a bump and blew many fuses. Replaced all and now Isolating each component and inspecting wiring and connectors and now blowing ECM Powered fuses. Just got ECM repaired. It had 2? Burned diodes. It still blows the 7.5 amp IGN fuse at the interior fuse panel. I'm a master level technician and so far it is not obvious.

Mechanic's Assistant: Have you checked the manual yet? Most vehicles have two fuse panels.

Yes it has also blown the 20 amp underhood EFI fuse. Ive unplugged the igniter module, cruise control, coils, IAC, MAF, and going for oxygen sensors next.

Mechanic's Assistant: Are you fixing your Tacoma yourself? What have you tried so far?

Yes Ive also unplugged the transmission relay and HVAC control. The cluster was not blowing any fuses when the ECM was out and it seems to operate. The motor will crank but it blows ECM power fuses. This appears to be a pattern failure on this truck. I am reading the information listed on this page and appreciate the help.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

The alternator regulator connector is also unplugged to isolate the "dead short" It was a Clear day when it happed 2 months ago. And when it blew all the fuses, the positive battery terminal seemed to be zapped too. That's all repaired properly now. It is a 2001 v6 manual trans 4x4. 210,000 miles. It cranks but won't fire with no power to the ECM. THANK YOU!

Submitted: 11 months ago.Category: Toyota
Show More
Show Less
Ask Your Own Toyota Question
Answered in 17 minutes by:
7/31/2017
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Toyota
Satisfied Customers: 5,626
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles
Verified

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Ask Your Own Toyota Question
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago

Hey how are you

I will try to help you with it

Click on link to view pdf file showing you ECM pin out an wiring power & ground circuit diagram and dlc pin out

ON PIN #16 AT DLC, YOU SUPPOSED TO HAVE CONSTANT POWER 12 VOLTS , DO YO HAVE 12 VOLTS ?

when you hit the bump, did you check the under carriage for any wiring harness got smashed against frame and a power wire shorted to the frame?

lets start here

Please let me know if you can view the links

Thank You

Chad Farhat

ASE Certified Technician

Ask Your Own Toyota Question
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago

ECM LOCATION

UNPLUGGED IT ,CHECK THE CONNECTOR PINS FOR NY BURNED, SHINE FLASH LIGHT INSIDE THE CONNECTOR TO SEE BETTER

DO YOU HAVE CAPABLE SCANNER ,CAN YOU COMMUNICATE WITH ECM

Ask Your Own Toyota Question
Customer reply replied 11 months ago
Great. I have done a good visual inspection and Yes I can open the links. I will be checkig the circuit continuity and Hoping to find this short tonight. Information is gold. You know this. And by the way I am also Chad. Nice to meet you. The ECM connectors look great. The ecm was sent out and professionally repaired. It had 2 or 3 burned diodes. They gurantee it was ready to be plug and play. Before the ECM repair, The cluster did not blow the fuse when powered up with ECM unplugged. I'm hoping its ok. It lights up warning lights and shows the odometer. So for Help. I am blowing the two fuses still. IGN 7.5 inside the truck and the 20A EFI fuse at the underhood panel. Something is shorting out this ECM I'm about to unplug oxygen sensors or just go for their fuses. I have Alldata at work and printed ecm diagrams and taped them together for a full diagram.
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago

cool we have 2 chad then .lol,nice meeting u too

do this if you can, are these fuse blowing as soon as you stic new one in there,if you go a litle higher on fuse it will still blow

do you see the evidence of hit ,on the under the frame, inspect that harness from battery down

oxygen sensor wiring smashed against the fire wall or melted around the exhuast manifold

Battery Drainage Test

1- Voltmeter
2- settings on voltmeter will be on milli amps.
3- go across all the fuses in the car and see which one is reading higher than 0.3 to 0.5 milli amps
4- the fuse drawing more than 0.5 miili amps ,will be the suspected circuit that needs inspection for the drainage.

Do you have power on # 16 pin on dlc

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Ask Your Own Toyota Question
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago

This is the starting circuit

check the Transmission position switch at trans

Ask Your Own Toyota Question
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago

Fuse list and wiring harness connector location

Ask Your Own Toyota Question
Customer reply replied 11 months ago
power at pin 16 of the dlc. It is a manual transmission truck. I have unplugged the transmission relay at the right side kick panel. I can plug the ECM in, connect the battery and it blows the two fuses, IGN inside and EFI underhood when the key is turned to the on position. I'll re inspect exhaust and oxygen sensor wiring. It had a Po420 last year, We repaired a minor exhaust leak at the flange near the catalytic and the codes never returned and it passed the smog test. I did not replace any of the sensors. A/F ratio sensor up front I think?
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago
I want you to probe the power pins on Ecm ,and see which one is drawing high amps ,
Unplug the igntion switch under the steering also , make sure the connector is not melted
Ask Your Own Toyota Question
Customer reply replied 11 months ago
I couldn't get the A/F sensor unplugged. Ill go to the transmission position.
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago

why cant you unplug it ,is because it is melted on ,or just hard to get the clip to release ?

Ask Your Own Toyota Question
Customer reply replied 11 months ago
It's only the fact I cannot get my hand around it. It is located on top of the manual transmission and My lift is a scissor lift in a garage. I might need to lower the trans. My hands vs a very tight location.
Customer reply replied 11 months ago
My diagram for the ecm is for an automatic transmission Tacoma base model. This is a manual transmission model and appears to not have daytime running lights. Exteded Cab by the way.
Customer reply replied 11 months ago
Like I say. It is a Crank no start condition with blowing the two ecm fuses. Connector E5 pins 1 and 2.
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 11 months ago

Not sure , I will opt out of this one and let another expert assist you on it

Just do not reply back to me since it will lock question back to me and no other expert can see it to assist you ,just wait and another expert will pick up question for you

Ask Your Own Toyota Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a toyota mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Chad Farhat Your Own Question
Chad Farhat
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Toyota
Satisfied Customers: 5,626
5,626 Satisfied Customers
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles

Chad Farhat 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

1,104 satisfied customers

16 years of experience

Marty

Marty

ASE Certified Technician

197 satisfied customers

ASE & Bosch Master Tech. 30 years experience.

Amedee

Amedee

Toyota Technician

1,243 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

13,051 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
I have a problem with a 1995 2.7L Tacoma, every time you
I have a problem with a 1995 2.7L Tacoma, every time you turn the ign key it blows the 7.5 amp ign fuse in the cab fuse panel, which to my understanding has something the do with the EFI relay and cir… read more
Merlin Beerens
Merlin Beerens
Toyota Master Technician
118 satisfied customers
My 30 amp fuse keep blowing when trying to start. Camry le
My 30 amp fuse keep blowing when trying to start JA: Do all the fuses have the correct amperage for the circuits they're in? Customer: Yes JA: What is the model/year of your Toyota? Customer: Camry le… read more
virtual auto tech.
virtual auto tech.
High School or GED
5 satisfied customers
I have a 93 Toyota pickup that isn't getting any power to
Hello, I have a 93 Toyota pickup that isn't getting any power to the fuel pump. Can you help me trace down the issue?… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,632 satisfied customers
I came across a conversation you had 4 years ago withy the
I came across a conversation you had 4 years ago withy the exact same problem I am having. I have 2007 tundra 5.7. Was driving and when went to stop at a stop sign it stalled. Now won't start. Just cr… read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
My name is ***** *****.i have a 1993 t100 that is not
Customer: hi my name is ***** *****.i have a 1993 t100 that is not getting gas to the plug . I have fuel to the cool start injet. but not to injeters . replaced efi relay .no start an plugs are still … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
97 Camary driving today just shut down cranks no start ,no
97 Camary driving today just shut down cranks no start ,no check engine light on dash w/key on no Comm w/OBD but has power to OBD no spark no fuel all fuses good except cig lighter fuse blew at same t… read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
Toyota tacoma: I have a 96 Toyota Tacoma and I have no
I have a 96 Toyota Tacoma and I have no voltage going to my coils my fuel pump won't come on just put the engine and I tried to start it it back fired then tryed again and had nothing. there's a new c… read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
I have a 03 tacoma prerunner 2.7 and readness monitors erase
I have a 03 tacoma prerunner 2.7 and readness monitors erase after i turn engine off what could the problem be?… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
geo prizm 1.8 manual: 95 geo prizm stopped running going down
95 geo prizm stopped running going down the road. now it is no start. tries to run on starting fluid so its getting spark. put new fuel pump and fuel filter in, still no start. In fact, no power to fu… read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
My 2006 Rav 4 will not start. There is no power to the fuel
My 2006 Rav 4 will not start. There is no power to the fuel pump or no spark from the spark plugs. The fan also stays on at all times. I have checked fuel pump and it is working, also have checked fan… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
13,051 satisfied customers
1994 Totota Camry 1994 Totota Camry: 1994 Toyota Camry 4cyl
1994 Toyota Camry 4cyl 2.2 has no power to ECM, and no power to ignition. What all would cause this condition? Also need the diagnosis chain of events to pinpoint the problem. Fuel pump will run when … read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
Toyota Camry: I took a paper clip and connected the diagnosis
I took a paper clip and connected the diagnosis +B to the E1 fuse and there was a spark. Now my car won't turnover. What should I do?… read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
Toyota Sequoia SR5: I have a 2001 Sequoia SR5 4wd with 160K
I have a 2001 Sequoia SR5 4wd with 160K miles. Has been running fine. The EFI-1 20A fuse blew and each one thereafter blows too as soon as I turn the key to the On position. It did this about 3 years … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Toyota pick up: I have a 1992 Toyota pickup truck with a v6
I have a 1992 Toyota pickup truck with a v6 3.0 effi engine I know my fuel pump is good I know my fuel pump relay is good but my fuel pump will not kick on when I try to start it what is the problem… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
13,051 satisfied customers
my 99 solarablows..efi fuse..fuel pump and the ecm have been replaced
my 99 solarablows the efi fuse when the key is moved to the run position. the fuel pump and the ecm have been replaced… read more
Mastertech 1
Mastertech 1
Lead Technician
Vocational, Technical or Trade Scho
1,755 satisfied customers
94 toyota pickup: wires, distributor cap, rotor..ran good..restart
I have a 94 toyota pickup with the 3vze engine, it was recently overhauled. Also replaced spark plugs, wires, distributor cap, rotor. Truck ran good for a couple weeks and then after I shut the truck … read more
Dj
Dj
Auto Failure Analysis & Inspections
High School or GED
1,360 satisfied customers
Hello 22re engine efi fuse blows immediately when turning
Hello 22re engine efi fuse blows immediately when turning on ignition. disconnect power to fuel pump, still blows. fuse will not blow when efi relay removed, replaced. All wires sensors checked.follow… read more
Marty
Marty
ASE Certified Technician
Associate Degree
197 satisfied customers
Swith..7.5 ignition fuse under dash still pops when key is turned on
ignition swith checks out good. 7.5 ignition fuse under dash still pops when key is turned on. Any other suggestions? Last had help from Kyle Northrop.… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
13,051 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