ICE RPM ?

not with any of the car's instrumentation. Some have installed tach's and some, with Classics have installed scanners.

 

Supposedly one of the pins in the DLCIII is a tach, but that stated from a Japanese poster. Not sure if that is true in US, as the wiring diagram does not indicate this.

 

<div class='quotetop'>QUOTE(Musikflier\";p=\"74778)</div>

There is TACHO signal available at pin5 of D connector on engine ECU and pin9 of DLC3 connector on Japanese models.

I made my own tacho-meter shown as my avatar.
http://priusdiy.fc2web.com/TACHO.html

Regards,
Ken@Japan

 

Ken, Do you have a 03 or less or a 04 or greater.

 

<div class='quotetop'>QUOTE(hdrygas\";p=\"75051)</div>

I have 2004 Prius.
It works on both 2001-03(NHW-11) and 2004-5(NHW-20).

Regards,
Ken@Japan

 

But I don't read japanese.

 

<div class='quotetop'>QUOTE(energy1\";p=\"75091)</div>

Maybe, it is not for you.
Maybe, babelfish will help you.

The instrument displays in English.
The schematic and program code at my site is for international(no Japanese) DIY freaks.
You can make such cool instrument in less than US$50.

Good Luck!
Ken@Japan

 

Thank you for the information and the photos, Ken!

 

What I ment was, I would love to build one, but i can not read the schematic.

Ron

 

I dont see much use. WIth the CVT function, the ICE speed will vary not only with speed, but with load. And of course it will shut off when EV running can be executed. My question is this: other than curiosity and accident-causing distraction, what actions will you take that are different depending on what the tach tells you? I just don't see the point. It's about as useful as a reading of ignition advance while driving.

 

Evan I use it almost all the time to hold my rpm when accelerating to road speed. I try and hold it to a steady 3000 rpm by backing off on the throttle as the car accelerates. The other info that I use is charging/discharging amps and temp info from battery cell temp to MG temps also the O2 sensor voltage and how and when it relates to S4. I don't have my head buried in the display but glance when time and safty considerations are met. MG temps while hill climbing as I have learned that there isn't a lot of amp draw if the rpm's are at 3000-3500 and the car is not gaining speed(MG1 output goes directly to MG2). That is on a really steep hill on the way home from work. 10% grade and about 45-50 miles an hour.

 

Well, knowing these things might explain why after I filled up on Wed night, I got fantastic mileage yesterday: 63 MPG total for 60 miles travelled, yet today it is still in the 60's but not as high, though traffic was much better today.

How do I get a circuit description (schematic, programming, etc) in English? Not so sure I like the idea of having to tap into all the sensor inputs/outputs.

 

<div class='quotetop'>QUOTE(efusco\";p=\"75375)</div>

So, the TACHO signal is pin5 of D connector same as Japanese models.

Yes, it is.

The other signals we got are...

Pin3 of A connecter: INJ
Pin 19 of A connecter: THW(coolant temp)
Pin 20 of A connecter: THA(intake-air temp)
Pin 9 of D connecter: +12V
Pin 7 of A connecter: GND

Regards,
Ken@Japan

 

<div class='quotetop'>QUOTE(DanMan32\";p=\"75684)</div>

Sorry, there is no such circuit description.
The schematics is all written in English.
It uses Atmel AT90S4433 microprocessor and the programming HEX files are at my site.
Please find your friend who has the programming tools for Atmel processors.

Regards,
Ken@Japan

 

<div class='quotetop'>QUOTE(ken1784\";p=\"75720)</div>

Ken:

That is one I would really like to have!

 

And your website for us English speaking folks would be? The file would be?

 

Dan, and at al.

Prepared the English page for you...
http://priusdiy.fc2web.com/en/TACHO.html

Enjoy,
Ken@Japan