Quote:
Originally Posted by stummala
well...i finally browsed onto this thread for the first time (and visited the site for the first time in 6 months!)..
Anyhow, here's some pointers with your ME-controlled M120 with 5-speed 722.6 transmission integration:
1. No, you cannot use the existing wheel speed sensors in your car (the front ABS ones), the ESP system uses different pulses at different rates and frequency. The ESP will be in limp mode, you'll have no throttle.
2. No, you cannot just install rear wheel speed sensors and expect the ESP system to work without all the yaw sensors, steering angle sensor (which goes in the steering column and integrates with a second generation airbag clock springs), the ESP electrohydraulic pump must be used and you need to use a master cylinder/brake booster assembly from an ESP car because it has a pressure release switch that is monitored by the ESP brain. If any of these items are not working, ESP is off, trans doesn't shift, car is in limp mode.
3. Yes, you MUST have STAR Diagnosis with DAS to go into the Development mode and version code the ME to delete features that it may no longer have (various additional sensors, etc.) otherwise count on permanent check engine lamps and possible limp mode condition. The development mode is only on Engineering versions of the DAS. We have one if you need any screen references, I can attempt to find them.
4. Yes, you must use the EIS system with ignition key otherwise, the ME will not receive a start authorization signal and will not fire the engine. It won't even crank.
5. In addition, the rear differential ratio MUST match the one from the donor vehicle or the transmission control unit will detect a mismatch ratio error and shut down the transmission completely and place the engine into limp mode.
There are several other items but these initial ones came to mind within seconds. I would probably forgoe the ESP system, simulate/generate wheel speeds, and go with an aftermarket system to manage the electronics (aka Steve Lemberg).
Satish
|
Thanks Satish
You just confirmed my worst fears. Actually ESP would be a nice thing to have and I do have all the sensors pump, brake cylinders and booster yaw sensors, steering angle sensors etc. My only problem is I would like to do this after the fact. But it seams the only way to do this is to go all or nothing. Complete MB ECU, Trans Control and ESP system. And if it doesn't work I would at least need the MB Star diagnostic system to do any trouble shooting. ESP would be a very cool feature to have. I believe Motec may have solutions for after market ESP however there stuff is way over my budget.
Plan right now is to just get it running any way possible and even that looks daunting. I will give it a shot with the MB ECU's and Trans controller and as you say fabricated signals or re-adapted wheel speed sensors. If that doesn't work I will go right to a Megasquirt unit. That still will leave me with the transmission to deal with. The new GPIO board from Megasquirt may take care of that if I can figure out the signals or the quick fall back may be the older 4 speed non electronic transmission.
Thanks for the replay
John Roncallo