Yea..if y our not going to drive it right away - after re-connecting the negative terminal - then wait until the morning. Ideally - you should at LEAST start the car, let it idle for a bit, tap the throttle to verify idle and make sure the engine is at normal operating temps before shutting down. If you can take it around the block..even better.

Rick

 

thanks

 

hopefully i get a reply in the morning. would it also clear everything that is stored in my navi?

-jeff

 

ive tried doing this for atleast a year and no luck.. then sxexcx did it in 5 minutes

 

wont affect NAV - but say goodbye to your radio presets...

 

I just did the ECU reset last night using the pedal method. Got it on the first try, but did it a second time just to make sure. I was wondering why my car felt a bit sluggish at the drag strip, so I thought this might help (i never reset the ECU, even after installing the mods in my sig)

My impressions - WOW! The car instantly felt peppier, with noticeably quicker throttle response and faster acceleration. I was very surprised... hopefully, I'll get a small improvement in my gas consumption, too. I'll be going to the track this Friday, so I'll see if the car actually IS faster...

 

Did and worked. My car feels more light and responsive. Thanks!!!

 

I am taking my car to the track on Friday as well. I also installed a couple of performance parts, but never did an ECU reset. I can not wait till tomorrow evening.

 

which "pedal" method? they're both pedal method. did you guys did the brake one or the gas?

 

The pedal method where you have to put the key in the on position, then (3secs after) press the gas pedal 5 times in less than 5 secs. Then, wait 7 secs and press the gas for 10 secs-you will see the service engine soon light blink- then release the pedal and press it again for 10 secs (I am not sure about this last part, but you can find the info at the beginning of this thread0.

 

I performed an ECU reset by doing the Key on ON, Pedal ON-OFF method and felt my car much more lighter and responsive after that. Unfortunately, I got to the race track late yesterday and could only race once. I will go next Friday and see if the "feeling" actually turns into better timing.
I ran against a new TLS, with cai, headers, exhaust and beat him. I started on 2nd gear, so I do not know if I could have done a better time. I was not able to push the RPM more than 2k before launch. However, my time was 9.511. That was the best time I did last week.

 

1/4 mile?

 

Ok i found the instructions on how to do it right here

<u>Basic ECU Reset</u>

Operations Procedures:

1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” (NOT start) 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 seconds.
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. Remember, timing is EXTREMELY critical to resetting the ECU. You may even need someone's help to do this correctly.


Note: The following reset procedures are directly from the 2004 G35 Sedan Service Manual.

<u>Accelerator Pedal Released Position Learning</u>

Description:
Accelerator Pedal Released Position Learning is an operation to learn the fully released position of the accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time harness connector of accelerator pedal position sensor or ECM is disconnected.

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


<u>Throttle Valve Closed Position Learning</u>

Description:
Throttle Valve Closed Position Learning is an operation to learn the fully closed position of the throttle valve by monitoring the throttle position sensor output signal. It must be performed each time harness connector of electric throttle control actuator or ECM is disconnected.

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


<u>Idle Air Volume Learning</u>

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 each time electric throttle control actuator or ECM is replaced, or if idle speed or ignition timing is out of specification.

Preparation:
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 12.9V (At idle)
- Engine coolant temperature: 70 - 100 Degrees C (158 – 212 Degrees F)
- PNP switch: ON (Park/Neutral Position Safety Switch - AT only, MT fully depress clutch)
- Electric load switch: OFF (Air conditioner, rear window defogger, headlamps. Note: on vehicles equipped with daytime light systems, if the parking brake is applied before the engine is started, the headlamps will not be illuminated.)
- Steering wheel: Neutral (Straight-ahead position)
- Vehicle speed: Stopped
- Transmission: Warmed-up (For A/T models, drive vehicle for 10 minutes.)

Operation Procedure:
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. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
7. Repeat the following procedure quickly five times within 5 seconds:
7a. Fully depress the accelerator pedal.
7b. Fully release the accelerator pedal.
8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops blinking and turned ON.
9. Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications:

Idle speed A/T: 650rpm, + or - 50 rpm (in P or N position)
Idle speed M/T: 650rpm, + or - 50 rpm (in N position)
Ignition timing A/T: 15 Degrees BTDC, + or – 5 Degrees BTDC (in P or N position)
Ignition timing M/T: 15 Degrees BTDC, + or – 5 Degrees BTDC (in N position)

13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried out successfully. If idle speed and ignition timing are within the specification and Idle Air Volume Learning cannot be performed successfully, find the cause of the incident by referring to the following Diagnostic Procedure:

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. When the above three items check out OK, engine component parts and their installation condition are questionable.
5. If any of the following conditions occur after the engine has started, eliminate the cause of the incident and perform Idle Air Volume Learning all over again:

- Engine stalls.
- Erroneous idle.







My question is do you have to perform the throttle learning prcedures and the idle air volume procedues, and the accelerator pedal prcedures or can you just do is these steps and thats it???...


<u>Basic ECU Reset</u>

Operations Procedures:

1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” (NOT start) 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 seconds.
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. Remember, timing is EXTREMELY critical to resetting the ECU. You may even need someone's help to do this correctly.

 

You can just do nothing and the ECU will adjust to what it feels should be the optimum values. Resetting the ECU may increase the time that the ECU takes to adjust. It's a 50/50 gamble and there is no way to know if resetting the ECU will help or hinder.

 

no one has done it, you're the first to find it