OBDIIC&C Gauge

[Calpod]

I've been erasing the old data before writing the new one, just to be safe....

[Eli]

V0.02 of the code used the standard OBDII type protocol.

V0.03 uses a special high speed mode that is a different communications protocol. So it appears there are differences in the ECMs.

I just overwrite, no need to erase before re-flashing.

[Right Lane Cruiser]

That explains it. Thank you, Eli.

[nasphere]

I've concluded after looking at the data from peter's ECM, and looking at the data from my ECM, there's more than one type.

It's either early/late model ECMs, or it's a country difference between US/UK cars.

I've been working hard on decoding the US protocol, so hopefully soon Peter can do an auto ECM mode switch.

[pascal28]

Originally Posted by retepsnikrep

We are having 100 boxes made with cutouts etc they should be available around christmas. price around £10 in UK. $10 in US

What's the progress on getting the boxes made? Thanks

[Eli]

Took a little longer than expected, but they're on their way to Peter now.

[retepsnikrep]

Someone in the US give this ago please and post a pic of the lcd.

Try rpm $00 for an obd parameter as well.

[eq1]

Originally Posted by Eli

I don't think the radiator fan is available on OBDII. Once Peter implements the Electronic Load Detector parameter, you would be able to tell it's on just by inference though.

Need more investigation into Auto-Stop. It seems to be a collaberation between the CCM and ECM that determine if AS is going to happen. I'm not sure if this is available on OBDII or not.

Edit: Oooh! A good one is the A/C compressor. That's available. Though IMO it's pretty easy to tell when that's on... lol

There is an "Idle Stop Control" parameter in the PGM-FI parameters, so that could be displayed.

List of "On/Off" parameters:

ECM:

O2#2 Heater
DC/DC Control
Backup Light Switch
Clutch Pedal Position Switch
NP Switch(?)
Brake Switch
A/C Switch
A/C Clutch
Starter Switch
Starter Control
VTEC Pressure Switch
VTEC Solenoid Valve
IMA Standby
Idle Stop Control
EVAP Bypass Solenoid
EVAP CVS Valve
Main Relay
Fan Control
Immobilizer

Hmm. I need to investigate what the "Fan Control" is, maybe that is the radiator fan? Neat, maybe I'm wrong.

IMA:

Assist Limit CMD
Regen Limit CMD
BM Fan Slow
BM Fan Fast
MPI Fan On/Off
MPI Fan Slow/Fast
HV Contactor
HV Contactor RTRN
Bypass Contactor
Bypass Contactor RTRN
IGHLD Relay(?)
IGHLD Relay RTRN
IMA Warning
MDM Fail
DC/DC Inhibitor
ABS Action

Would either of these, "VTEC Pressure Switch" and/or "VTEC Solenoid Valve" indicate which VTEC mode the car is in, or perhaps stated more correctly, simply whether VTEC is engaged or not? That might be a useful indicator for the LCD 'sidebar', in addition to the battery fan icon or what not. Or maybe it's related to lean burn and would be redundant? Here's a blurb on the VTEC-e system from wikipedia:

"VTEC-E is a variation of SOHC VTEC which was used to increase efficiency at low RPM. At low RPM, one of the two intake valves is only allowed to open a very small amount, increasing the fuel/air atomization in the cylinder and thus allowing a leaner mixture to be used. As the engine's speed increases, both valves are needed to supply sufficient mixture. A sliding pin, which is pressured by oil, as in the regular VTEC, is used to connect both valves together and allows the full opening of the second valve. The engine runs at normal performance using the second cam position that would typically be tuned for high-RPM performance in other two-stage VTEC designs."

[Eli]

Originally Posted by eq1

Would either of these, "VTEC Pressure Switch" and/or "VTEC Solenoid Valve" indicate which VTEC mode the car is in, or perhaps stated more correctly, simply whether VTEC is engaged or not? That might be a useful indicator for the LCD 'sidebar', in addition to the battery fan icon or what not. Or maybe it's related to lean burn and would be redundant? Here's a blurb on the VTEC-e system from wikipedia:

It has nothing to do with lean burn, but sure it could be used to indicate whether VTEC is engaged or not. It would be interesting, but it's much more obvious whether VTEC is engaged or not than whether you're in lean burn or not, so it's kinda a no brainer.

[aisbell]

Originally Posted by Eli

It has nothing to do with lean burn, but sure it could be used to indicate whether VTEC is engaged or not. It would be interesting, but it's much more obvious whether VTEC is engaged or not than whether you're in lean burn or not, so it's kinda a no brainer.

I know how going in and out of lean burn feels, but I don't know how to determine whether VTEC is engaged or not in the 2,500 - 3,000 RPM range when apparently it might or might not be engaged. Please educate me!