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 ase_master327 Your Own Question

ase_master327
ase_master327, Shop Owner
Category: Honda
Satisfied Customers: 5288
Experience:  +15 years experience with Hondas. Bumper to bumper diagnosis & repair.
Type Your Honda Question Here...
ase_master327 is online now
A new question is answered every 9 seconds

1998 Honda accord: idle control system malfunction..warning lights

Customer Question

My 1998 Honda accord came up w/ a P0505 code; idle control system malfunction and the panel warning lights are on. Can you tell me exactly what is going on?
Submitted: 6 years ago.
Category: Honda
Expert:  ase_master327 replied 6 years ago.

Which engine?

Customer: replied 6 years ago.
Reply to ase_master327's Post: V6 3.0 vtec
Expert:  ase_master327 replied 6 years ago.

This is a malfunction of the idle control system. Keep in mind that if there is a short in this system that it is VERY likely that the computer will also be damaged. It is not uncommon to have to replace an IAC along with a computer...Anyways, here are instructions for finding out the cause of this problem on your 3.0 V6 Accord.

1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.

2. Check the engine speed at idle with no-load conditions: headlights, blower fan, rear defogger, radiator fan, and air conditioner are not operating. Is it 700 ±50 rpm ?

YES-Intermittent failure, system is OK at this time.

NO-If the idle speed is less than 650 rpm , go to step 3; if it's 750 rpm or higher, go to step 4.

3. Disconnect the 3P connector from the IAC valve. Dose the engine speed increase or fluctuate? YES-Adjust the (base) idle speed. If it's impossible, clean the ports in the throttle body. NO-Replace the IAC valve.

4. Turn the ignition switch OFF .

5. Remove the intake air duct from the throttle bod.

6. Start the engine and let it idle

graphic

7. Put your finger on the lower port (A) in the throttle body. Does the engine speed drop?

YES-Adjust the idle speed. If it's impossible, replace the IAC valve.

NO-Check for vacuum leaks, make sure the throttle valve is completely closed, and repair as necessary.

ase_master327, Shop Owner
Category: Honda
Satisfied Customers: 5288
Experience: +15 years experience with Hondas. Bumper to bumper diagnosis & repair.
ase_master327 and 7 other Honda Specialists are ready to help you
Customer: replied 6 years ago.
Thank you for your answer. In regards XXXXX XXXXX warning lights in the panel (ABS, battery, oil, and brake lamps), does it have anything to do with the alternator or maybe a short circuit in the electrical system?
Expert:  ase_master327 replied 6 years ago.

Thanks!!

Anyways with the lights on, I would be really looking into the code, just for the simple fact that it is an idle system malfunction. If the engine is not idling fast enough, then the lights will come on. This is because the alternator will not be turning fast enough to charge the system creating a lower than normal voltage condition.

If the lights are on even while driving down the road, then yes...I would be inspecting the wiring or maybe even a main relay (though not the most likely cause).

The only one I am really concerned with is the battery light, so put a voltmeter to the battery with the engine RPM raisedf above idle, and check the voltage. It should be NO LESS than 13DCV. If it is, then you can start looking into the wiring or chraging system for the cause of the problem.

If you still need anything, I'll be in and out 24/7, though it may show me to be online all the time...It is only because my internet connection stays on. Laughing

 

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 very much for saving my daughter and her family a lot of money on her Honda. You are definitely on my list for future help. Thanks, again. Fred USA
< Last | Next >
  • Thank you very much for saving my daughter and her family a lot of money on her Honda. You are definitely on my list for future help. Thanks, again. Fred USA
  • I just heard from my mechanic. You were right...a $45.00 job. THANK YOU!! Your response was received in less than 10 minutes!! Linda B. USA
  • Your answers were clear and the diagrams were perfect. Dealer wanted $87 for an hour of labor and even I did it in 15 minutes. Ed USA
  • HONDA PLATINUM was great. I really appreciate his help. I was ready to trade my new Honda until he told me to wait until I got 3,000 miles on it and my gas mileage would get much better. Summer USA
  • I took the Power Steering O-Ring service bulletin linked from JustAnswer to my Acura dealer, and not only did they no-charge the o-ring, they also replaced the power steering pump at no cost. Gary R Stevenson Ranch, CA
  • 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
 
 
 

Meet The Experts:

 
 
 
  • Kyle N.

    Honda Master Tech

    Satisfied Customers:

    3627
    Honda Dealer Tech, ASE Master Auto Tech
< Last | Next >
  • http://ww2.justanswer.com/uploads/hondatech/2010-05-03_025935_resized_work_pic.jpg Kyle N.'s Avatar

    Kyle N.

    Honda Master Tech

    Satisfied Customers:

    3627
    Honda Dealer Tech, ASE Master Auto Tech
  • http://ww2.justanswer.com/uploads/hondacb77/2008-10-27_165606_me3.jpg John G.'s Avatar

    John G.

    Honda Technician

    Satisfied Customers:

    2643
    Dealership tech since 1982. ASE and Honda Master Technician.
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    204
    16 years of experience
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    175
    ASE Certified Tech 34 years.
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    Bosch Master Tech

    Satisfied Customers:

    113
    Bosch Certified Master Technician
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Technician

    Satisfied Customers:

    1112
    ASE Master Technician advanced level specialist. Wisconsin certified emissions state inspector
  • http://ww2.justanswer.com/uploads/TH/thebesthonda/2011-1-15_04510_Photo022009005.64x64.jpg thebesthonda's Avatar

    thebesthonda

    ASE MasterTechnician

    Satisfied Customers:

    2299
    26 years experience