VCM Controls

[Dirty Howie]

If I connect to the car and use VCM to turn off closed loop and fuel trim learn as well as reset the fuel trims while the car is running can I then disconnect the compupter and just use my MPVI to do the log????

Or must I keep the computer hooked up.

Also as soon as the car is turned off I assume these need to be reapplied with car running and VCM Control

Thanks


DH

[Bill@HPTuners]

the computer must be hooked up to use bidirectional controls or RTT.

[Dirty Howie]

the computer must be hooked up to use bidirectional controls or RTT.

The RTT makes sense!!!

But if the car is started and I use VCM to reset feul trims. Leave the car running and my MPVI connected at the OBII but disconnect the computer....aren't the FT's reset????????


DH

[Bill@HPTuners]

yes...theres a difference between a 1 time reset & turning off closed loop in b-di.

Once you hit the fuel trim reset button the trims just reset to 0%...they start to immediatly move though.

The rest of the controls are all scanner driven meaning the scanner( not standalone datalogging) must be in use & connected.

[Dirty Howie]

yes...theres a difference between a 1 time reset & turning off closed loop in b-di.

Once you hit the fuel trim reset button the trims just reset to 0%...they start to immediatly move though.

The rest of the controls are all scanner driven meaning the scanner( not standalone datalogging) must be in use & connected.

OK....Thanks!!!

I decided to start over doing my VE tuning. Warmed up, nice and easy, not PE and making sure the feul trims are reset before each log (thus the VCM questions) this time.

Plus I am driving with a cracked rotor from the track on saturday so no WOT till replacement this weekend...gotta move my jack and tools from burnt house to rental house though


DH