Idle control through the ECM
Idle control through the ECM
(OP)
I would like to control the idle RPM so that the battery voltage is maintained when the electrical load is increased. I would like to accomplish this through the ECM. The vehicle is a 2002 suburbans with a 6.0 vortec. Unfortunately it has a mechanical throttle control as apposed to a drive by wire. I am trying to avoid a mechanical solution.





RE: Idle control through the ECM
I don't know about your engine in particular, but ours is fed a pulse width modulated signal to control engine speed.
The problem you face is that if the vehicle is in drive it will lurch forward from a standstill when the idle speed gets increased. I strongly recommend that you put some sort of interlock in to enable this feature when the car is in Park only and Neutral only. There will be a switch that detects that already.
Cheers
Greg Locock
RE: Idle control through the ECM
RE: Idle control through the ECM
For normal passenger vehicles, I believe your ecm will trip a code if it sees excessive RPMs while in park, and think the P-N switch is bad and that you are really in gear.
RE: Idle control through the ECM
RE: Idle control through the ECM
Cheers
Greg Locock
RE: Idle control through the ECM
RE: Idle control through the ECM
Cheers
Greg Locock
RE: Idle control through the ECM
any time the ECM ups the idle (A/C for instance, or transmission engagement, or PSPS signal, etc... ) it uses the IAC. easy way might be to tap into the A/C or PSPS lines and use that- i have no idea how much extra current you'd get though.
RE: Idle control through the ECM
I have just tested an Inpower throttle control on a non-ETC 2002 suburban and it seems to work ok. So I have the Suburban idle up problem solved. I now have the same problem to solve on a Mercedes ML500. Your idea on using the AC or PSPS is a good one.
Thanks