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Z&I · 09-11-2015, 12:40 PM

Found these two examples/references to Idle Relearn on some other Nissan Sites ... probably applies to the Z as well.

The first example is a shortened techique and I think the guy got lucky.
The second is a bit more involved - that's why I took mine down to the dealer to have it done.
This all happened some time after the Stillen Kit was initially installed and the 'Tuner' tried to fix it but never got it right.

From other Nissan Forums:Hope this helps

Idle relearn after unplugging throttle body

I cleaned a throttle body on 2005 Altima 2.5 and when I started the car it was idling very fast. Between 1000rpm and 1500rpm. It was actually jumping from 1000 to 1500 constantly when in park. I tried the procedure listed in service procedure several times but it did not work. I read in the forum to change the procedure just a little bit. Here is the procedure that worked for me.
warm up engine to normal operating temp.
turn off all equipment such as defrosters, a/c radio etc
1. turn key switch off for 10 seconds
2. insure accelerator pedal is fully released turn ignition switch on for 3 sec.
3. with ignition still on depress accelerator fully 5 times within 5 seconds
4. wait 7 seconds then fully depress accelerator for approx 20 sec or until the
MIL or service engine soon light stops blinking and turns on.
5. release the accelerator within seconds after service engine soon light comes
on.
6. start engine within the mentioned 3 seconds.. I did it as soon as service
engine soon light came of solid. and the idle dropped to about 700 rpms
in park. Drove around block all well so far. stopped and started engine
and relearned was maintained.

NOTE: Service Engine Soon light must be off and all faults cleared before this
procedure works. Gene Mayberry

MORE DETAILED
Well, Nissan has now totally taken away the ability to adjust idle speed. Aside from making sure that ignition timing is correctly (which really is not adjustable except for a very small amount), the idle speed is programmed into the ECU, is not adjustable, and can only be reset by performing the idle-air relearn procedure. Of course, the idle-air relearn simply allows the ECU to re-discover if the target idle rpm is incorrect, allows it to readjust.

It CAN be done without the Consult, but is MUCH easier for the dealer by using the Consult.

Without the consult:

Perform accelerator released position relearn by NOT depressing the accelerator pedal at all:

1) Turn ignition on for at least 2 seconds.
2) Turn ignition off for at least 10 seconds.
3) Turn ignition on for at least 2 seconds
4) Turn ignition off for at least 10 seconds.

Perform throttle closed position relearn by:

1) Turn ignition on for at least 2 seconds.
2) Turn ignition off for at least 2 seconds.

THEN you can perform the idle-air relearn procedure:

1.PRECONDITIONING
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°C (158 - 212°F)
• PNP switch: ON (in PARK or NEUTRAL)
• Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
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

• Without CONSULT-III: Drive vehicle for 10 minutes.
- M/T models
• Drive vehicle for 10 minutes.

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.
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 and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON.
8. Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
9. Start engine and let it idle.
10. Wait 20 seconds.

Idle speed CVT: 600 ± 50 rpm (in P or N position)
M/T: 600 ± 50 rpm (in Neutral position)
Ignition timing CVT: 12 ± 5° BTDC (in P or N position)
M/T: 12 ± 5° BTDC (in Neutral position)

Entering the ECU into the idle-air relearn follows the same procedure as pulling fault codes from the ECU, except once the CEL starts flashing, just keep the pedal to the floor. Once it stops flashing and turns solid, let off the pedal and start the engine.

Hope this helps,
Trav

09-11-2015, 12:40 PM	#425 (permalink)
Z&I Enthusiast Member Join Date: Feb 2013 Location: New Jersey Posts: 410 Drives: '09 370z 6MT FI Rep Power: 12	Idle relearn Found these two examples/references to Idle Relearn on some other Nissan Sites ... probably applies to the Z as well. The first example is a shortened techique and I think the guy got lucky. The second is a bit more involved - that's why I took mine down to the dealer to have it done. This all happened some time after the Stillen Kit was initially installed and the 'Tuner' tried to fix it but never got it right. From other Nissan Forums:Hope this helps Idle relearn after unplugging throttle body I cleaned a throttle body on 2005 Altima 2.5 and when I started the car it was idling very fast. Between 1000rpm and 1500rpm. It was actually jumping from 1000 to 1500 constantly when in park. I tried the procedure listed in service procedure several times but it did not work. I read in the forum to change the procedure just a little bit. Here is the procedure that worked for me. warm up engine to normal operating temp. turn off all equipment such as defrosters, a/c radio etc 1. turn key switch off for 10 seconds 2. insure accelerator pedal is fully released turn ignition switch on for 3 sec. 3. with ignition still on depress accelerator fully 5 times within 5 seconds 4. wait 7 seconds then fully depress accelerator for approx 20 sec or until the MIL or service engine soon light stops blinking and turns on. 5. release the accelerator within seconds after service engine soon light comes on. 6. start engine within the mentioned 3 seconds.. I did it as soon as service engine soon light came of solid. and the idle dropped to about 700 rpms in park. Drove around block all well so far. stopped and started engine and relearned was maintained. NOTE: Service Engine Soon light must be off and all faults cleared before this procedure works. Gene Mayberry MORE DETAILED Well, Nissan has now totally taken away the ability to adjust idle speed. Aside from making sure that ignition timing is correctly (which really is not adjustable except for a very small amount), the idle speed is programmed into the ECU, is not adjustable, and can only be reset by performing the idle-air relearn procedure. Of course, the idle-air relearn simply allows the ECU to re-discover if the target idle rpm is incorrect, allows it to readjust. It CAN be done without the Consult, but is MUCH easier for the dealer by using the Consult. Without the consult: Perform accelerator released position relearn by NOT depressing the accelerator pedal at all: 1) Turn ignition on for at least 2 seconds. 2) Turn ignition off for at least 10 seconds. 3) Turn ignition on for at least 2 seconds 4) Turn ignition off for at least 10 seconds. Perform throttle closed position relearn by: 1) Turn ignition on for at least 2 seconds. 2) Turn ignition off for at least 2 seconds. THEN you can perform the idle-air relearn procedure: 1.PRECONDITIONING 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°C (158 - 212°F) • PNP switch: ON (in PARK or NEUTRAL) • Electric load switch: OFF (Air conditioner, headlamp, rear window defogger) 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 • Without CONSULT-III: Drive vehicle for 10 minutes. - M/T models • Drive vehicle for 10 minutes. 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. 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 and keep it for approx. 20 seconds until the MIL stops blinking and turned ON. 8. Fully release the accelerator pedal within 3 seconds after the MIL turned ON. 9. Start engine and let it idle. 10. Wait 20 seconds. Idle speed CVT: 600 ± 50 rpm (in P or N position) M/T: 600 ± 50 rpm (in Neutral position) Ignition timing CVT: 12 ± 5° BTDC (in P or N position) M/T: 12 ± 5° BTDC (in Neutral position) Entering the ECU into the idle-air relearn follows the same procedure as pulling fault codes from the ECU, except once the CEL starts flashing, just keep the pedal to the floor. Once it stops flashing and turns solid, let off the pedal and start the engine. Hope this helps, Trav __________________ . BB