Medium and Heavy Trucks

Have Truck Repair Questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

Medium and Heavy Trucks

I have a 1999 peterbilt with a 3406e model 2ws serial #

Customer Question
hi I have a 1999 peterbilt...
hi
I have a 1999 peterbilt with a 3406e model 2ws serial # ***** in it. I have a engine fan problem. Fan stays on all the time. In cab switch does not work either way on auto or manual. when checking the switch I have power to it and when you flip the switch you get power coming back out of switch but I never get power back up to the solenoid. Solenoid is new. if I hard line route air to the fan it will go on and off. I also have some issues with the motor running rough and vibrating , pour acceleration, low turbo boost. water is clean and motor burns no oil. have put a ton of new parts into it and still baffled. could it be the ECM?
Submitted: 1 year ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 3 minutes by:
1/6/2016
Technician: Cat Man, Cat Engine Expert replied 1 year ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,012
Experience: I am ASE Master Truck Certified.
Verified

Thanks for asking your question. I will try and help you out.

Yes it's possible to have a faulty ECM. But often a bad ECM is not the problem.

The ECM will turn on the cooling fan, if any of the following conditions are detected by the Engine ECM:
The engine coolant temperature is greater than 102 °C (216 °F).
There is an active diagnostic code for the coolant temperature sensor.
There is an active diagnostic code for the intake manifold air temperature sensor and boost pressure is greater than 70 kPa (10 psi).
The intake manifold air temperature is greater than 87 °C (189 °F).
The intake manifold air temperature is greater than 72 °C (162 °F) while the boost pressure is greater than 70 kPa (10 psi).
The "Fan with Engine Retarder in High Mode" is programmed to "YES" and the retarder has been on at least two seconds.
The "A/C Switch Fan On-Time" is programmed to a value above 0 and the A/C high pressure switch is Open.
The manual fan override switch is on.
If you do not notice any of these conditions occurring, one of the items above may be faulty and causing the fan to stay on. For example, you could have a faulty AC high pressure switch, manual over ride switch, or the wiring to one of these items could also be faulty. The tough part is if one of these is faulty, there will not be a check engine light or fault code.

The best way to determine what is causing the engine fan to stay on is to connect a service tool like Cat ET software and monitor the fan and all of the switches that are connected to it. If one of the above is keeping the fan on, it will be easy to see. For example, if you have a bad AC high pressure switch, it will say that the AC switch is wanting the fan on.

If nothing can be seen with the service tool, you most likely have a faulty fan control solenoid, fan hub, or broken fan control wire that runs from the engine ECM. It is on pin 11. Basically, the ECM sends out 12 volts on pin 11 whenever the ECM wants the fan off. When the ECM wants the fan on, it removes the 12 volts from pin 11.

If your fan is on and you have NO POWER coming out of pin 11, one of the items I first mentioned is making the ECM want to keep the fan ON.

If your fan is on and you have POWER coming out of pin 11, you have a faulty fan control solenoid, fan hub, or broken fan control wire.

Please reply back if you need more help or have more questions. I am happy to assist.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 1 year ago
cat has hooked it up to ecm 4 times to try to figure it out. does not throw a code of any kind. has farely new fan hub that works just fine if I hard line route it to a air switch. solenoid is brand new and switch in cab has been changed and still no change. I do not get any power to solenoid. I still have the problem with the motor running rough vibrating like the timing is advancing or retarding and loss of turbo boost. which is why I was asking ecm?
Customer reply replied 1 year ago
also fan is not to have anything to do with jake brake of cruse control as set in ecm.
Technician: Cat Man, Cat Engine Expert replied 1 year ago

Thanks for the information.

It is very possible it's the ECM. It's rare but I see it from time to time.

The ECM sends out 12 volts to turn the fan off. When it wants the fan on it removes power. If it takes power to turn the fan on. The. Your truck has a relay between the pin 11 ECM wire and fan solenoid. I would make sure the relay is OK. If the relay is good. The only way to verify a bad ECM is to install a known good ECM.

As far as the low boost and vibrating. I would check the fuel pressure. If it is low there will be no codes. Your engine should maintain a fuel pressure between 75 and 90 psi. There is a plug beside of the secondary fuel filter that is used to check the pressure. If it is low, I would first try the fuel filters if you haven’t already. If it is still low, you may have a failed fuel pressure regulator, which is located underneath the bottom of the filter housing. I have replaced a ton of these for low fuel pressure. It is kinda a known problem. You could also have a weak fuel transfer pump or restricted hand primer pump, if your engine has one.

Please reply back if you need more help or have more questions. I am happy to assist.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 1 year ago
I have a brand new wiring harness from firewall of truck to ecm and that is where the wire comes out for the fan solenoid. I see no relay in that wire. is there another location it could be? fuel pressure checked to 85 psi and has new fuel pump and fuel lines.
Technician: Cat Man, Cat Engine Expert replied 1 year ago

The relay is normally on the fire wall or near it.

If it takes power to engage the fan there is either a relay or the fan solenoid is the wrong one. Normally if there is a relay you can flow the wires from the fan solenoid and it will lead you to it.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 1 year ago
the wires from the solenoid go directly into the harness that go to ecm. 2 wires and there is no relay in it. the solenoid looks just like the one that was on it before and got it from Peterbilt off of the vin # ***** truck.
Technician: Cat Man, Cat Engine Expert replied 1 year ago

A power to engage fan solenoid and a power to disengage fan solenoid look the same. It could be the wrong one.

When the fan is on I would check for power on pin 11 of the ECM. If you have power on pin 11. The fan should be off. If it is not. It's either a bad fan solenoid, bad relay(if there was one), or a broken wire from pin 11, or a bad fan hub.

Ask Your Own Medium and Heavy Trucks Question
Technician: Cat Man, Cat Engine Expert replied 1 year ago

Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

Ask Your Own Medium and Heavy Trucks Question
Ask Cat Man Your Own Question
Cat Man
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,012
9,012 Satisfied Customers
Experience: I am ASE Master Truck Certified.

Cat Man 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:

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

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

2,139 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

9,012 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

2,495 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

1,974 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician

cumminsdr

cumminsdr

Mechanic

1,195 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

770 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

dieseldan55

dieseldan55

Contractor

74 satisfied customers

Road Service mechanic for Volvo Construction.

< Previous | Next >

Related Medium and Heavy Trucks Questions
Can someone tell me about a CAT 3126 engine? what is the
OK , can someone tell me about a CAT 3126 engine ? what is the tightening proceedure for the injectors . Modle 3129 Serial number #8YL06969 year 1999 . Thank you .… read more
Cat Man
Cat Man
Cat Engine Expert
9,012 satisfied customers
Ray this is jose again I have a 2015 freightliner came in on
hi ray this is jose again I have a 2015 freightliner came in on the hook for derate put laptop on and got fault code3712 count 1 spn 5246 and also 3714 fault code count 1sid 11 fmi 31 spn 1589 can you… read more
roy
roy
Associate Degree
3 satisfied customers
Do you check the transmission on the d85a dozer with the
Do you check the transmission on the d85a dozer with the engine going … read more
Curtis B.
Curtis B.
Technician
Associate Degree
770 satisfied customers
I just need to fonf the engine oil pressure sensor on mu
I just need to fonf the engine oil pressure sensor on mu acert so o can replace it … read more
catmastertech
catmastertech
Field service technician
Vocational, Technical or Trade Scho
1,287 satisfied customers
I have a Sumitomo SH145X-6 would You have a workshop manual
I have a Sumitomo SH145X-6 would You have a workshop manual for me … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,139 satisfied customers
Have a 2008 4200 vt365. Changed the oil per manual. About 19
Have a 2008 4200 vt365. Changed the oil per manual. About 19 qts. total volume. Added about 75% of new oil, started motor, oil pressure came up quickly, ran motor for 5 min. and shut down. Waited 5 mi… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,139 satisfied customers
I have a 2005 9513 Sterling truck can you tell me how to
I have a 2005 9513 Sterling truck can you tell me how to free up defrost door … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Vocational, Technical or Trade School
1,974 satisfied customers
Jeremy. me again. 2011 kw. vin 324311. esn. 79506891. codes.
heya Jeremy. me again. 2011 kw. vin 324311. esn. 79506891. codes. 0352. no 5v sensor supply circuit voltage below or shorted. code 2272. egr valve circuit voltage below 5v.i know these are related. ba… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Vocational, Technical or Trade School
1,974 satisfied customers
I need the information of what it takes to replace the #5
I need the information of what it takes to replace the #5 Injector tube on a Paccar MX13 engine.… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
I have a 2013 mack mru613 with a mp7 engine it has a code
I have a 2013 mack mru613 with a mp7 engine it has a code spn 3490 fmi 12 mack says this is not there code the code description is aftertreatment 1 purge air actuator-bad intelligent device or compone… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,139 satisfied customers
Tricks to changing the air brake compressor on a d13 on
tricks to changing the air brake compressor on a d13 on driver side … read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
After replacing the solenoid valve I ran my truck this week
Hello, after replacing the solenoid valve I ran my truck this week and at after 2000 miles , it started to shut off again. The truck is giving me the same code. mid 128 sid 17 fmi 4. could something e… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,139 satisfied customers
Nu stiu sa pun cureaua la distributie la un siveco dely din
Nu stiu sa pun cureaua la distributie la un siveco dely din 2003 typ 35c12 … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Vocational, Technical or Trade School
1,974 satisfied customers
I am looking for suggestions for the most reasonable price
I am looking for suggestions for the most reasonable price on a storage box that mounts on the bottom of a stake bed truck the measurements are 48x24x24… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Vocational, Technical or Trade School
1,974 satisfied customers
Want to put turbo on 1996 new Holland 6640. will 7740 parts
want to put turbo on 1996 new Holland 6640. will 7740 parts match? … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,495 satisfied customers
I have a 2014 cascadia/dd15. I accidentally stopped my regen
Hi I have a 2014 cascadia/dd15. I accidentally stopped my regen twice and caused a DEF quality code That immediately derated my engine to 5 miles an hour. Most likely have a regen cycle too frequent c… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,139 satisfied customers
Volvo L35B Wheel Loader pops out of forward and reverse.
Volvo L35B Wheel Loader pops out of forward and reverse. Need model specific info not general trouble shooting procedures.… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Vocational, Technical or Trade School
1,974 satisfied customers
I am looking for the idle adjustment Cummons 8.3 C6TA 1996.
Hello I am looking for the idle adjustment Cummons 8.3 C6TA 1996 … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,139 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