02 altima. problems since replacing throttle valve

[bri25an]

hi.

i replaced the throttle valve a few months ago and ever since then it has been running like crap. it just doesnt sound the same. and every now and then the service engine soon light comes on and the trouble shooting code im getting now is that its idling high. do i need to take it to the car dealership and have them reprogram the ecm or something. please can somebody help me out.

[FixUrNissan]

When ever the Throtle body gets replace, there is a procedure that must be done. It is called an Idle relearn. Unfortunately the only person who can do it it the dealer with there special scan tool. GL...

[vmarnat]

I have problem also - my idle keeps jumping from 1000 to 2000 when AC compressor is off. I have 2005 altima

[FixUrNissan]

I would love to help, but I no longer answer questions on this sight. I now work for JustAnswer.com. If you need help, you can go there and I will be happy to help you. Thanks

FixUrNissan

[ashtonad]

This problem was driving me crazy, too, and I finally got it fixed. For free. At home.
Here's the procedure I found at another forum with some extra info (in red). It didn't work the first time through, so I started over at Step 1. Then it worked. The MIL – or Service Engine Soon (SES) - didn't stop blinking and go out for me - it stayed on steady. So when it stops blinking - whether it stays off or on - just stops blinking, then make sure that within the next 3 seconds you fully release the accelerator and start your engine. Do NOT turn the ignition off and then back on - just crank the rest of the way. Let it run with the accelerator pedal released and after a little bit the idle will go down. You'll still have to clear the code. But I cleared it 10 days ago on my car and it's still not back on and idling low. I had to deal with this for the past 3 years so I understand how aggravating it can be. Also, use a stopwatch or timer (my kitchen timer doesn't show seconds, but the flashing dots between hour and minute flash at exactly one second. That's what I used) or digital watch to check time. When he says, "at least" give an extra second or two. When "exactly," do it at exactly that amount of time. It works! Here's the solution I found:

1. ENGINE COLD
2. Perform "Accelerator Pedal Released Position Learning" .
3. Make sure that accelerator pedal is fully released.
4. Turn ignition switch “ON” and wait at least 2 seconds.
5. Turn ignition switch “OFF” wait at least 10 seconds.
6. Turn ignition switch “ON” and wait at least 2 seconds.
7. Turn ignition switch “OFF” wait at least 10 seconds.
8. WAIT over 10 seconds before this next step.
9. Perform "Throttle Valve Closed Position Learning" .
10. Make sure that accelerator pedal is fully released.
11. Turn ignition switch “ON”. WAITEXACTLY ONE SECOND SHARP. Turn ignition switch “OFF”
12. THEN wait at least 10 seconds.
13. Make sure that throttle valve moves during above 10 seconds by confirming the operating sound. - Very hard to hear anything at all. Just believe this is happening by faith.

Now, here's the big change

1. Start engine and warm it up to normal operating temperature.

AND RIDE YOUR CAR FOR AT LEAST 15 MINUTES, this will make for correct operating temperatures to happen within the engine for the following steps. Warming your car in the garage in the morning apparently does not cut it.


Check that all items listed under the topic “PREPARATION” (previously mentioned) are in good order.

1. Turn ignition switch “OFF” and wait at least 10 seconds.
2. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
3. Repeat the following procedure quickly five times within 5 seconds.
4. Fully depress the accelerator pedal. Fully release the accelerator pedal.
5. Wait 7 seconds
6. Fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops blinking and turns off or stays on.
7. Fully release the accelerator pedal within 3 seconds after the MIL goes off. Start engine and let it idle. THE ENGINE MUST BE STARTED WITHIN THE 3 SECONDS AFTER IT STOPS BLINKING, THATS HOW THIS LIGHT GOES OFF. THE SERVICE MANUAL DOES NOT STATE THIS, BUT IF YOU LOOK AT THE DIAGRAM WHERE THE ENGINE LINE ON-OFF IS, IT CLEARLY SHOWS YOU SHOULD TURN IT ON WITHIN THESE THREE SECONDS.

This is where your engine will start to learn the correct idle settings

1. Wait 20 seconds.
2. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.