How to: reset ECU or check error codes - Infiniti FX Forum : FX35, F45 and FX50 Forums
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#1 (permalink) Old 09-25-2008, 01:12 PM
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How to: reset ECU or check error codes

Sorry if this is posted elsewhere. I took a quick look around and couldn't find anything... I've seen some people in the past few weeks asking (or suggesting to) how to reset the ECU or check error codes. This is on page EC-72 of the factory service manual for those of you with access. Much easier to do this than to go through the trouble of making an appointment and bringing it in to the dealer (and possibly paying them )

1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
2. Repeat the following procedure quickly 5 times within a 5 second period:
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
(this confused me the way they worded it... what it means is within 5 seconds push the gas pedal to the floor and fully release it 5 times... pretty simple but they make it sound complicated)
3. Wait 7 seconds, fully depress the acclerator pedal and keep it for approximately 10 seconds until the MIL starts blinking.

NOTE: Do not release the accelerator pedal for 10 seconds if MIL may start blinking on the halfway of this 10 seconds. This blinking is displaying SRT status and is continued for another 10 seconds. For the details, refer to EC-55 "Emmission-related diagnostic information" (basically, wait until the SES light starts blinking before letting go)

4. Fully release the accelerator pedal.

ECM has entered to Diagnostic Test Mode II (Self-Diagnostic results).

NOTE: Wait until the same DTC (or 1st trip DTC) appears to confirm all DTCs certainly. (what this means is wait until you get the same error code before stopping paying attention... you may have 2 or 3 error codes stored)

How to ERASE Diagnostic Test Mode II (Self-Diagnostic Results):

1. Set ECM in Diagnostic Test Mode II (Self-Diagnostic results). Refer to above.
2. Fully depress the accelerator pedal and keep it for more than 10 seconds.
3. Fully release the accelerator pedal and confirm the DTC 0000 is displayed.

What I usually do is check the error code first, shut the ignition to off and start from scratch, and THEN reset it. The only difference is with erasing it, you'll hold the gas pedal down longer than the approximately 10 seconds and it'll erase the codes. This will NOT however erase codes that are caused by real problems. If the code comes back, you should look into whatever the root cause is and not continue to try to "make it go away" by resetting the ECU. Also resetting the ECU on a regular basis is never a good idea. I personally try not to do it unless I have a problem where I've researched the problem and replaced or fixed the part. Either that or I was fooling with something and forgot to plug a sensor back in thus resulting in a code. Then I'll reset the ECU and be on my way.

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#2 (permalink) Old 09-25-2008, 01:19 PM
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Re: How to: reset ECU or check error codes

why is it a bad idea to reset on a regular basis? because of the benefits of the learning soley or is there another reason you say this?

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#3 (permalink) Old 09-25-2008, 01:36 PM
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Re: How to: reset ECU or check error codes

I'm by no means a computer genius but I know that the ECU has to "relearn" the car... any modifications and your driving style all over again. If it takes the car 3 days to do that and you're resetting the ECU every other day, it'll never learn anything and it'll likely go into a state of confusion. There's also the debated fact that the ECU can only be reset a finite amount of times. I know Rob was there up in Westchester when we went to the Subaru tuner's dyno and he refuted it but I wouldn't screw with the debate. It just seems logical to me that it's not something that you'll be able to reset an infinite amount of times and eventually the ECU's going to say enough is enough and just stop working on you.

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#4 (permalink) Old 09-25-2008, 05:55 PM
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Re: How to: reset ECU or check error codes

Very nice Kieran! Moving this to the How to forum!


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#5 (permalink) Old 09-25-2008, 07:12 PM
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Re: How to: reset ECU or check error codes

Easy way is to disconect the negative battery lead overnight.You will have to re-program your radio station presets.Not sure if your seat pre sets will have to be re done.

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#6 (permalink) Old 09-25-2008, 08:04 PM
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Re: How to: reset ECU or check error codes

Thanks John!

Not only will disconnecting the battery reset your radio (and probably seats) but it won't completely clear your ECU. One thing I forgot to mention is that you have to be pretty close to exact with the timing. I usually hold a watch up to my ear to time it. The one piece of timing that I think doesn't matter if it's exact is the 7 seconds to wait before depressing the gas pedal. I think I've waited 8-10 seconds before pushing the gas pedal down and it's still worked. The important thing is to be patient and keep trying if you have to. The first time it took me like 5 tries to get it. Now all my friends with new(er) cars ask me to do it since I can usually get it on the first try

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#7 (permalink) Old 09-25-2008, 08:23 PM
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Re: How to: reset ECU or check error codes

Quote:
Originally Posted by MTN FX
Easy way is to disconect the negative battery lead overnight.You will have to re-program your radio station presets. Not sure if your seat pre sets will have to be re done.
What I'll do if I need to disconnect the battery is I turn off the feature of moving the steering wheel and seat when I exit. Then after reconnecting the battery, I just set the memory button and turn those 2 features back on... TA-DA! Just hate having to reset my radio settings though... and the headunit BASS, TREBLE, etc...


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#8 (permalink) Old 09-25-2008, 08:35 PM
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Re: How to: reset ECU or check error codes

Fixes the problem of seat memory... still won't fix any codes stored in the ECU.

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#9 (permalink) Old 09-26-2008, 08:05 PM
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Re: How to: reset ECU or check error codes

Quote:
Originally Posted by kieranlavin
Thanks John!

Not only will disconnecting the battery reset your radio (and probably seats) but it won't completely clear your ECU. One thing I forgot to mention is that you have to be pretty close to exact with the timing. I usually hold a watch up to my ear to time it. The one piece of timing that I think doesn't matter if it's exact is the 7 seconds to wait before depressing the gas pedal. I think I've waited 8-10 seconds before pushing the gas pedal down and it's still worked. The important thing is to be patient and keep trying if you have to. The first time it took me like 5 tries to get it. Now all my friends with new(er) cars ask me to do it since I can usually get it on the first try
OK heres the long way

Please read all instructions and be familiar with them before any attempts.
A stop watch or an analog clock with a second?s needle will be useful.

ECU Resetting Procedures

Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset and the Check Engine Light (CEL) will continue to remain ON.
A stop watch or an analog clock with a second?s needle will be useful.

Operations Procedures

1. Confirm that accelerator pedal is fully released, turn ignition switch ?ON? and wait 3 seconds.
2. Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking.
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to ?OFF? position and now you can start the car. The CEL light should be gone.

If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.


Accelerator Pedal Release Position Learning

Operation Procedure
1. Make sure that the accelerator pedal is fully released.
2. Turn ignition switch ?ON? and wait at least 2 seconds.
3. Turn ignition switch ?OFF? wait at least 10 seconds.
4. Turn ignition switch ?ON? and wait at least 2 seconds.
5. Turn ignition switch ?OFF? wait at least 10 seconds.


Throttle Valve Closed Position Learning

Operation Procedures
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch is ?ON?.
3. Turn ignition switch is ?OFF? wait at least 10 seconds.
Make sure that the throttle valve moves during above 10 seconds by confirming the operating sound.


Idle Air Volume Learning (Throttle Position Learning)
It is better to count the time accurately with a clock.

Operation Procedures
1. Perform ?Accelerator Pedal Released Position Learning?.
2. Perform ?Throttle Valve Closed Position Learning?.
3. Start engine and warm it up to normal operating temperature.
4. Turn ignition switch ?OFF? and wait at least 10 seconds.
5. Conform that accelerator pedal is fully released, turn ignition switch ?ON? and wait 3 seconds.
6. Repeat the following (steps 7a, 7b) procedures quickly five times within 5 seconds.
7a. Fully depress the accelerator pedal (HARD)
7b. Fully release the accelerator pedal.
8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the Check Engine Light (CEL) stops blinking and turned ON.
9. Fully release the accelerator pedal within 3 seconds after the CEL is ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure the idle speed and ignition timing are within the specifications.

*You have to do the accelerator position learning sequence first!*

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#10 (permalink) Old 03-13-2009, 06:32 AM
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Re: How to: reset ECU or check error codes

sorry to bring an old thread back .. but want to put my 2 cent's worth in,
IMO and its only 10 years in the Business IT trade. and none in the car computer trade...

You can reset your ECU as many times as you want, its a basic computer that stores information and using that information controls the egine out put and responses. basically understanding the information sent to it from all of the cars sensors.

ECU's turn off when the car isnt running, and the car battery keeps the ecu's memory, running as such, storing the last (preset period of time or limited to storage size) amount of information to then do its job, mange the engine, display errors. Much like juniper or New Cisco Switches only storing 49 copies of the config. why store more that you are likely to need.

SO eventually getting bavck to the point.....no amount of resetting or cleaing the ECU will force the ECU to crash
but allowing the ECU to relearn a driving style, over a period of a week or so would help the ecu settle and save data that would be useful to diagnose a problem or get the car running more suitably

Thanks for reading just wanted to add my 2 cents/euro's/pounds

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