M35 - High Idle And Bad Fuel Economy

[MrStabby]

Idle is 950. Is it supposed to be 650? Sometimes when the engine is cold it will rev up and down a bit before it settles upon starting. It seems to be a specific sequence like the ECU is trying something.

My OBD2 scanner cant read the M35, and from a quick google it seems like thats common. Does the ECU have an LED flashing status output feature? I'd like to see what the ECU thinks before trying random stuff like simply changing the o2 sensor and/or MAF.

[Commsman]

Try this first: http://www.m35stagea.info/forum/viewtopic.php?f=6&t=206&p=4015&hilit=idle+relearn#p1899

[MrStabby]

Thanks for that.

It looks like that stuff came from http://www.nicoclub.com/archives/g35-how-to-reset-ecu-throttle-pedal-release-idle-air-volume-learning.html but the m35stagea.info link doesn't include the Accelerator Pedal Release Position Learning Procedure and Throttle Valve Closed Position Learning Procedure, which are steps 1 and 2. From the link they're;

Accelerator Pedal Release Position Learning 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 Procedures
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch to “ON”.
3. Turn ignition switch to “OFF” wait at least 10 seconds.
Make sure that the throttle valve moves during above 10 seconds by confirming the operating sound.

The Accelerator pedal position procedure is a superset of the Throttle Valve Closed procedure, so I reckon there's no need to run the Throttle Valve Closed procedure separately, since you've actually just done it as part of the Accelerate pedal position procedure.