Nissan 370Z Forum - Throttle body relearn

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Throttle body relearn

Am i able to clean the throttle bodies one day then do the procedures the next morning due to the heat so my coolant is cold enough or do i have to do all within the same day or pretty close apart

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If I'm not mistaken, you are supposed to bring the engine up to normal operating temperature prior to performing the TB relearn. Make sure all accessories are off, too.

I believe Jar is correct.

I saw your post in this thread earlier today, but of you scroll up to Scott's directions for the relearn procedure, under "Idle Air Volume Learning (Throttle Position Learning)", number 3 says to bring it up to temperature.

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Custom ported and CNC throttle bodies, upper and lower manifolds

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From what i came across i think its the second part of the procedure that the coolant temp has to be below 77°f, after that then the car needs to be at normal operating temp to finish the procedure. I could for sure be wrong though. That being said i just wanted to know if i can clean the tb's today then leave it till the morning to do the procedure so i can achieve that below 77°f temp, being that its pretty hot these days

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Also for refrence i saw a vid by a guy under the name Motorvate Diy, seemed legit but thought id cross refrence

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For the TB Closed Position Learning procedure, it does note for the engine to be cooled before warming up. The Idle Air Learning procedure also has a specific temp range.

Quote:

Originally Posted by FSM

ACCELERATOR PEDAL RELEASED POSITION LEARNING
START
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.

Quote:

Originally Posted by FSM

THROTTLE VALVE CLOSED POSITION LEARNING
START
WITHOUT CONSULT-III
1. Start the engine.
NOTE: Engine coolant temperature is 25°C (77°F) or less before engine starts.
2. Warm up the engine.
NOTE: Raise engine coolant temperature until it reaches 65°C (149°F) or more.
3. Turn ignition switch OFF and wait at least 10 seconds.
Check that throttle valve moves during the above 10 seconds by confirming the operating sound.

Quote:

Originally Posted by FSM

IDLE AIR VOLUME LEARNING
PRECONDITIONING
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 - 105°C (158 - 221°F)
• PNP switch: ON (M/T models), Selector lever: P or N (A/T models)
• Electric load switch: OFF (Air conditioner, headlamp, rear window defogger)
Note: On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is
started the headlamp will not be illuminated.
• Steering wheel: Neutral (Straight-ahead position)
• Vehicle speed: Stopped
• Transmission: Warmed-up
- A/T models
• Without CONSULT-III: Drive vehicle for 10 minutes.
- M/T models
• Drive vehicle for 10 minutes.

PERFORM IDLE AIR VOLUME LEARNING Without CONSULT-III
NOTE:
• It is better to count the time accurately with a clock.
• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a malfunction.
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. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
6. Repeat the following procedure quickly five times within 5 seconds.
- Fully depress the accelerator pedal.
- Fully release the accelerator pedal.
7. Wait 7 seconds, fully depress the accelerator pedal for approx. 20 seconds until the MIL stops blinking and illuminates.
8. Fully release the accelerator pedal within 3 seconds after the MIL illuminates.
9. Start engine and let it idle.
10. Wait 20 seconds.

CHECK IDLE SPEED AND IGNITION TIMING
1. Start engine and warm it up to normal operating temperature.
2. Let it idle for 20 seconds.
3. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. Refer to EC-640, "Idle Speed" and EC-640, "Ignition Timing".

DETECT MALFUNCTIONING PART-I
Check the following
• Check that throttle valve is fully closed.
• Check PCV valve operation.
• Check that downstream of throttle valve is free from air leakage.

Quote:

Originally Posted by JARblue (Post 4000031)

For the TB Closed Position Learning procedure, it does note for the engine to be cooled before warming up. The Idle Air Learning procedure also has a specific temp range.

This is pretty close if not exact to that motorvate vid. If someone can check that out and lemme know if that rundown is legit it'd be easier to go off that and this and not just reading it

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:rolleyes: did you ask other people to do your homework for you in grade school?

What I posted is verbatim from the Factory Service Manual. You can verify the Motivate video if you want. Personally, I hate watching videos. People like hearing themselves talk, so there's always too much extra bs to sift through; that or the video is too short with little to no useful information. I will say that Motivate seems to have good videos. You're probably safe but the risk is on you.

Quote:

Originally Posted by JARblue (Post 4000044)

You've helped a lot and i really appreciate it but this is a first so i've much to learn, being a jack doesn't help anyone though.

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Quote:

Originally Posted by robbieZ208 (Post 4000053)

this is a first so i've much to learn.

Yes, you do. I'm not going to apologize for not spoon feeding you because you're too lazy to read :twocents:

Quote:

Originally Posted by robbieZ208 (Post 4000053)

being a jack doesn't help anyone though.

Says you. It helps me keep myself entertained ;)

Quote:

Originally Posted by robbieZ208 (Post 4000027)

Also for refrence i saw a vid by a guy under the name Motorvate Diy, seemed legit but thought id cross refrence

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yup he is on myg37.com and has interesting content on the electrical side of the cars and bluetooth gadgets, gauges, aftermarket tinkering

Quote:

Originally Posted by spoolin03 (Post 4016076)

yup he is on myg37.com and has interesting content on the electrical side of the cars and bluetooth gadgets, gauges, aftermarket tinkering

He's popular around here either. He knows his stuff.

Quote:

Originally Posted by JARblue (Post 4000031)

For the TB Closed Position Learning procedure, it does note for the engine to be cooled before warming up. The Idle Air Learning procedure also has a specific temp range.

Hello, thank you for posting these, after cleaning the TBs do you have to do all three of these? Pedal position, throttle valve position, and IAV learning?