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john t, ASE Certified Technician
Category: Nissan
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Experience:  27 years experience foreign and domestic
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i got the code p505 on the scanner saying idle control system.

Customer Question

i got the code p505 on the scanner saying idle control system. i changed the idle control valve but the car continues to idle up and down like it was doing before i changed the valve. the problem didn't stop and it continues to do the same thing
Submitted: 4 years ago.
Category: Nissan
Expert:  john t replied 4 years ago.
you posted the question twice , please read my other post to you for the answer
john t, ASE Certified Technician
Category: Nissan
Satisfied Customers: 85
Experience: 27 years experience foreign and domestic
john t and other Nissan Specialists are ready to help you
Customer: replied 4 years ago.
i dont see your answer
Expert:  john t replied 4 years ago.
Question List - PM - Feedback - Reports - My Questions - Tools JustAnswer Nissan

 

 

i have a 2001 nissan maxima. i changed the idle control valve

Sent to Nissan Experts 11/26/2009 at 10:11 AM -- Report --Mis-CategorizedRefund RequestedSpam"Best Of" JAClose QuestionOpen QuestionToo DifficultDuplicate QuestionUnderpricedNonsensePersonal InfoUnderaged CustomerOther

i have a 2001 nissan maxima. i changed the idle control valve and the car still idles up and down and when you drive it the car loses power and seems like it doesnt want to go i keep get the p505 code on the scanner. can you help me figure this problem out

 

Optional Information:
Year: 2001
Make: Nissan

Already Tried:
i have changed the idle control valve but the problem still occurs to be happening

(Online) -- 1 Accept / 2 Questions (2 Open) Bookmark and Share You are watching. Click here to un-watch. Time Left: 1 day and 22 hours Status: Awaiting Customer Action Value: $9 Source: Web Answer EditSubmit this Q&A as an Expert Test Question 11/26/2009 at 10:35 AM (23 minutes and 33 seconds later)

try this , i assume you dont have access to the factory scan tool so follow the directions

for without scan tool. if this does not work , i suspect original problem was iac and iac

burned ecm.

 

DESCRIPTION
"Idle Air Volume Learning" is an operation to learn the idle air volume that keeps each engine within the specific range. It must be performed under any of the following conditions:

PRE-CONDITIONING
Before performing "Idle Air Volume Learning", make sure that all of the following conditions are satisfied.

Learning will be cancelled if any of the following conditions are missed for even a moment.

  • Battery voltage: More than 12.9 V (At idle)
  • Engine coolant temperature: 70 - 99 °C (158 - 210 °F)
  • PNP switch: ON
  • Electric load switch: OFF (Air conditioner, headlamp, rear window defogger)

On vehicles equipped with daytime Eight Systems, set lighting switch to the 1st position to light only small lamps.

  • Cooling fan motor: Not operating
  • Steering wheel: Neutral (Straight-ahead position)
  • Vehicle speed: Stopped
  • Transmission: Warmed-up For A/T models with CONSULT-II, drive vehicle until "FLUID TEMP SE" in "DATA MONITOR" mode of "A/T" system indicates less than 0.9 V .

For A/T models without CONSULT-II and M/T models, drive vehicle for 10 minutes .

OPERATION PROCEDURE

WITH CONSULT-II

  1. Turn ignition switch "ON " and wait at least 1 second .
  2. Turn ignition switch "OFF " and wait at least 10 seconds .
  3. Start engine and warm it up to normal operating temperature.
  4. Check that all items listed under the topic "PRE-CONDITIONING" (previously mentioned) are in good order.
  5. Turn ignition switch "OFF " and wait at least 10 seconds .
  6. Start the engine and let it idle for at least 30 seconds .

View Full Image

View Full Image

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  1. Select "IDLE AIR VOL LEARN" in "WORK SUPPORT" mode.
  2. Touch "START " and wait 20 seconds .
  3. Make sure that "CMPLT" is displayed on CONSULT-II screen. If "INCMP" is displayed, "Idle Air Volume Learning" will not be carried out successfully. In this case, find the cause of the problem by referring to the NOTE below.

View Full Image

  1. Rev up the engine two or three times. Make sure that idle speed and ignition timing are within specifications.

WITHOUT CONSULT-II

  1. Turn ignition switch "ON " and wait at least 1 second .
  2. Turn ignition switch "OFF " and wait at least 10 seconds .
  3. Start engine and warm it up to normal operating temperature.
  4. Check that all items listed under the topic "PRE-CONDITIONING" (previously mentioned) are in good order.
  5. Turn ignition switch "OFF " and wait at least 10 seconds .
  6. Start the engine and let it idle for at least 30 seconds .

View Full Image

  1. Disconnect throttle position sensor harness connector (brown), then reconnect it within 5 seconds .
  2. Wait 20 seconds .
  3. Make sure that idle speed is within specifications. If not, the result will be incomplete. In this case, find the cause of the problem by referring to the NOTE below.

View Full Image

  1. Rev up the engine two or three times. Make sure that idle speed and ignition timing are within specifications. NOTE: If idle air volume learning cannot be performed successfully, proceed as follows:
  1. Check that throttle valve is fully closed.
  2. Check PCV valve operation.
  3. Check that downstream of throttle valve is free from air leakage.
  4. Adjust closed throttle position switch and reset memory. (Refer to Basic Inspection.)
  5. When the above three items check out OK, engine component parts and their installation condition are questionable. Check and eliminate the cause of the problem. It is useful to perform "TROUBLE DIAGNOSIS - SPECIFICATION VALUE".
  6. If any of the following conditions occur after the engine has started, eliminate the cause of the problem and perform "Idle air volume learning" all over again:
    • Engine stalls.
    • Erroneous idle.
    • Blown fuses related to the IACV-AAC valve system.

 




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Expert:  Jay replied 4 years ago.
Just Helping a Fellow expert.

There is a Service Bulletin on this P0505 code. The IAC valve can burn out the Ecm! So it will require you to replace both. I would unplug the Ecm and take a whiff. If you smell something burnt, then you need a Ecm. If you don't, then try the idle relearn. The Ecm is location is in the back center of the car. So if you were sitting in the passenger seat, it would be at your left foot. There is a small panel that comes off and the Ecm connector is right there.

I hate to say it, but once you have the P0505 code, most common since there is even a bulletin on this, is to replace both components.

Have a Happy Thanks Giving and thank you for using JustAnswer.com

Thanks Jay!

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