Question about 1999 Nissan Altima

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Iac will idle control value make car keep a noise

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  • Nissan Master
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I do not think so,could get stuck.

Posted on May 09, 2013


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Why my 2004 trailblazer keeps dieing when i stop


IAC - idle air control motor , Vacuum leaks . Dirty throttle body . Videos on youtube for cleaning throttle body , IAC , and finding vacuum leaks .
Quick Tip Throttle Cleaning EricTheCarGuy

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Mar 27, 2017 | Cars & Trucks

1 Answer

Ford Code P1505 for 1994 Ford Thunderbird Lx


Adaptive Idle Air Control Strategy

The Adaptive Idle Air Control (IAC) strategy is designed to adjust the IAC calibration to correct for wear and aging of components. When engine conditions meet the adaptive strategy learning requirement, the strategy monitors the engine and determines the values required for ideal idle calibration. The adaptive strategy stores these values in a table for reference. This table is used by the PCM as a correction factor when controlling idle speed. The adaptive idle table is stored in Keep Alive Memory (KAM) and retains the learned values even after the engine is shut off. A Diagnostic Trouble Code (DTC) is output to indicate that the adaptive IAC strategy has reached its learning limits.

Diagnostic Trouble Code (DTC) P1505 indicates the IAC system has reached the adaptive clip.

Possible causes:

-- Air leaks.

-- Plugged air filter element.

-- Throttle body/linkage binding.

-- Contaminated or damaged IAC valve assembly.

-- Damaged throttle body.

Sep 22, 2012 | Ford Thunderbird Cars & Trucks

1 Answer

I have a 1999 ford contour 2.5 v6 high idle excessive noise from iac and goes away on accel


I have teh same vehicle/engine and had the same problem. I replaced the IAC and have not heard the noise since.

Jan 29, 2012 | Ford Contour Cars & Trucks

1 Answer

Engine idles around 2000 rpm when in park. Dont knpow how to lowere idle speed


Sounds like your Idle Air Control (IAC) value is bad. The IAC is located on your throttle body. It has two screws that attach it and it is easy to replace (if needed). Try taking the electrical connector off of the IAC to see if this corrects the situation. If your car's idle drops to 700-800, then replace the IAC. If the idle is still high, then I would look at the throttle position sensor. Also remember that if a sensor is bad you may get a check engine light coming on. I hope this helps.

Mar 29, 2011 | 1999 Oldsmobile Intrigue

1 Answer

When i turn on the ac the idle goes low and the the car vibrates. When i turn off the ac the car stop vibrating.



Operation

The Idle Air Control (IAC) valve controls the amount of air that bypasses the throttle valve, which controls the engine idle speed. The IAC valve consists of windings, an armature, a return spring, and a rotary slide. The engine control module (ECM) pulses the voltage to the winding, the opposing forces on the armature by the return spring cause it to maintain a fixed position, adjusting the amount of bypass air to maintain the correct idle speed.


Removal & Installation

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the idle air control valve harness electrical connector.
  3. Using a suitable tool, remove idle air control valve.
  4. Installation is in reverse order of removal.


Testing

Checking Idle Air Control Valve (IAC) Triggering

  1. Check IAC valve is electrically OK.
  2. Slide up boot on the IAC valve connector.



0900c152801c00a1.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. IAC Connector

  1. Use scan tool 'Output Diagnostic Test Mode' function 03 to trigger the IAC valve - N71.
  2. Connect VAG 1527B voltage tester, or equivalent, between terminal 1 and engine ground (GND). Voltage tester must flash.
  3. Connect VAG 1527B voltage tester, or equivalent, between terminal 2 and battery positive voltage (B+). Voltage tester must light up.
  4. If specified results are not obtained:
    1. Connect VAG 1598/19 test box, or equivalent, to ECM harness connector.
    2. Check the wiring between harness and connector terminal 1 (in engine compartment) to test box socket D11 . Then check the wiring between harness connector terminal 2 and test box socket D9 using wiring diagram. Repair as necessary.
    3. If the wiring is okay, but triggering still does not occur, replace the ECM.
    4. If the triggering signal and the wiring are okay and the valve does not react, replace the IAC valve.


Checking Mechanical Function
  1. Remove the idle air control (IAC) valve.
  2. Visually check the surface of the rotary slide (arrow) for signs of wear.



0900c152801c00a2.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Showing the IAC Valve

WARNING Do NOT check for ease of movement by prying on the rotary slide with a screwdriver or other tools that could cause scratching or other damage.

  1. Reconnect the IAC valve, while still removed, to the harness connector.
  2. Use scan tool 'Output Diagnostic Test Mode' function 03 to trigger IAC valve - N71.
  3. Check whether rotary slide moves freely from stop to stop.
  4. If there are signs of scoring, or if the rotary slide does not move freely in both directions, replace the IAC valve.
  5. If the IAC valve does not respond (not triggered) during the Output Diagnostic Test Mode, check triggering.

Resistance Test
  1. Remove the idle air control valve harness connector.
  2. Use a suitable Digital Multimeter (DMM) to measure the resistance between the 2 terminals of the idle air control valve.
  3. The correct measurement should be 7-11 ohms. If not, replace the idle air control valve.


NOTE At room temperature, the resistance value will be lower. The resistance value will be higher if the Idle Air Control (IAC) valve is measured at under-hood operating temperatures.
  1. Reconnect the idle air control valve harness connector.
  2. The idle air control valve should hum and vibrate slightly when the ignition is turned 'ON'. If not, the ECM or harness may be defective.

Testing with VAG1551:
  1. Remove the idle air control valve harness connector.
  2. Connect the VAG 15278 LED tester to terminals 1 and 2 of the harness connector using the jumpers from VW 1594 adaptor kit.
  3. Turn ignition ON, perform steps from output DTM (Diagnostic Test Mode) to activate the IAC valve (N71) LED tester must blink.
  4. If tester does not blink, check wiring using VAG 1598 pin out box, electrical checks, step 26. Repair as necessary.
  5. If wiring is okay, replace the ECM.
  6. If LED tester blinks but the IAC valve does not operate, replace the IAC valve.

Feb 15, 2011 | 2000 Volkswagen Jetta TDI

1 Answer

Fast idle


Fast idle could be the result of a few things; however, I would start with your Idle Air Control (IAC) Value. This is is mounted on your car's throttle body and it controls your vevicles idle speed under various conditions. It is easy to access. Try cleaning your IAC. Even a little bit of carbon build up could impact your car's idle.

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Jan 15, 2011 | 1995 GMC Sonoma

1 Answer

Engine cuts out and restarts at 5 second intervals


Hmm without a scan too it's hard to say what the problem is exactly. We know it's not the MAF. Could also be the IAC or leaky intake manifold gaskets (common on these escapes and tributes). With a scan tool you should be able to read what value the computer is using for barometric pressure. Normal BARO Hz reading is 155-159 Hz at sea level and drops about 3 Hz for every 1000 feet gained in altitude. The Powertrain Control Module (PCM) calculates the barometric pressure from the Mass Air Flow (MAF) sensor input under certain WOT modes of operation. If the MAF is cleaned or replaced, perform an adaptive relearn on the PCM by disconnecting the battery negative or pulling the PCM's Keep Alive Memory (KAM) fuse of the under hood fuse box, for 10-15 minutes. After reconnection, start the engine and monitor the fuel trim readings and BARO readings, during and after a test drive, to verify normal values and that the problem is repaired. If it doesn't keep running while applying gas it doesn't sound like the Idle Air Control. you could try cleaning it just to check to see if it improves. try this though:
check the Idle Air Control Valve (IAC) % on a scan tool to see if the PCM is commanding the IAC open. The higher the percentage, the faster the idle should be.
Check Key On Engine Off (KOEO) and KOER Differential Pressure Feedback EGR (DPFE) sensor voltage, to verify that the Exhaust Gas Recirculation (EGR) valve is not stuck open. If the DPFE voltage increases when the engine is started, the EGR valve is stuck open.
Test the Idle Air Control (IAC) solenoid function when cold. Try tapping on the IAC with a screwdriver handle to see if it is stuck.
Hope this helps!


Jan 07, 2010 | 2001 Ford Escape

1 Answer

94 thunderbird code 1505


Diagnostic Trouble Code (DTC) P1505 indicates the IAC system has reached the adaptive clip.
Possible causes:
  • Air leaks.
  • Plugged air filter element.
  • Throttle body/linkage binding.
  • Contaminated or damaged IAC valve assembly.
  • Damaged throttle body
The Adaptive Idle Air Control (IAC) strategy is designed to adjust the IAC calibration to correct for wear and aging of components. When engine conditions meet the adaptive strategy learning requirement, the strategy monitors the engine and determines the values required for ideal idle calibration. The adaptive strategy stores these values in a table for reference. This table is used by the PCM as a correction factor when controlling idle speed. The adaptive idle table is stored in Keep Alive Memory (KAM) and retains the learned values even after the engine is shut off. A Diagnostic Trouble Code (DTC) is output to indicate that the adaptive IAC strategy has reached its learning limits.
Whenever an IAC component is replaced or cleaned or a service affecting idle is performed, it is recommended that KAM be cleared. This is necessary so the idle strategy does not use the previously learned adaptive values.
To clear KAM, refer to PCM Reset in Section 2. It is important to note that erasing DTCs with a scan tool does not reset the adaptive idle table.
Once KAM has been reset, the engine must idle for fifteen minutes (actual time varies between strategies) to learn new adaptive values. Idle quality will improve as the strategy adapts. Adaptation occurs in four separate modes. The modes are transmission select in neutral with air conditioning on; transmission select in neutral with air conditioning off; transmission select in drive with air conditioning on; and transmission select in drive with air conditioning off.

Jul 01, 2009 | 1998 Ford Explorer

3 Answers

2005 honda accord stalls every time i stop


Hi there Your idle speed is controlled by a idle control value. You must firstly identify whether your PGM-FI ECU has a blinking code and what that code is. It might identify that the idle control value is playing-up. You will find the idle control value connected to the inlet manifold by way of vacuum hoses. It might be that the vacuum hose has dropped off or is broken - if that's the case, simply reconnect or replace the vacuum hose and your problem should be rectified. Best regards, Scottech.

Feb 26, 2009 | 2005 Honda Accord

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