Paging the early-R1-isti

On first switching on the ignition, I sometimes see the temp gauge
read '85' well, from what I recall) for a couple of seconds before it
reverts to 'LO'.

Is this an error code, or what?

 

See the manuals at
http://www.mediafire.com/?sharekey=e1aaf243515e6570e3a302d4c35173bfcb43d23145c05c7c

Condition codes are shown on the tacho.

I suspect the temp gauge remembers the last recorded temperature and the ECU
only samples the temperature at certain intervals.

Try turning it off once LO has appeared. Does LO reappear immediately?

 

Unlike Honda whose build quality is excellent.

Alan

(i'll get my coat shall i?)

 

Well, I'd be surprised. It'd have to remember overnight - at the very
least - and I can't see a reason for putting variable real-time info,
like the current engine temperature, into NVR. I suppose the RAM
could be held up by the battery backup for the clock but I don't
recall the temperature getting that high usually, though it does rise
a bit at the end of a journey. I'll have to make a note of what it is
next time before I switch off.

 

the other possibility is that the 85 should be an 88 i.e. a diag test of
the LCD segments and you have a couple out. Of course, if this was the case
your LO would be wonky too...

 

I know where you're coming from. When I got the R1 I tried a blade of
the same vintage and while it was very capable it just didn't feel as
good. It's funny but I just knew the R1 was going to be right the
moment I sat on it.

 

There speaks a man who missed the 80s.
--
Champ

ZX10R | GPz750turbo | GSX-R 600 racer
My advice as your attorney is to buy a motorcycle
To email me, neal at my domain should work.

 

Oh I dunno. Honda produced some fine machines in the 80's. There was
the.. err.. I'm sure I'll think of one..

The VFR750? (came out in 1988)

Mind you if you take the avaerage over all their bikes the one or two
good ones get drowned in the piles of absolute cack.

Phil

 

Phil Launchbury wrote:

1986 actually.

 

Really? <Googles>

So it was. You learn something every day.

Phil

 

It's an 01, which I *think* was the first of the revised ones, but may
be wrong.

Really do love this bike. Love the engine, the suspension, the
stability, the civility through towns. It's great.

 

*chuckle*

Get a fucking _life_, you pathetic loser.

D.

 

This is toooooooooooo easy...

D.

 

Well, it seems that you were right: it remembers the last temperature
reading. I'm guessing that the entire microcontroller stays powered
but merely reduces or shuts off its cpu clock when in standby.

 

I doubt it stays powered. The CPU will have access to some form of NVM for
storing error codes, fuelling data etc. On older stuff this would be
battery backed up RAM[1]. On more recent stuff, such as an R1, a FLASH
memory device.

[1] such as the Xerox made AC Delco units I worked on in 1990

 

Nah. Seriously. What would be the point of going to the trouble (and
expense) of providing & programming NV memory for transient real-time
data? Programming it won't be a problem if it's I2C memory that's
embedded in the chip, but you'd have to be seriously short of memory
to resort to using that for what could be fitted into an 8-bit
variable.

Keeping a chip powered may actually be the easiest option - CMOS draws
negligible current if it's not clocked and it's surprisingly difficult
to build a system that's half battery powered - you get all sorts of
parasitic leakage paths including transistors that operate 'backwards'
when reverse-biased.

I've worked with small, embedded microcontrollers and ASICs. You'd
have to have a damn good reason for using NV memory for that sort of
thing.

 

I'm just going on what we were provided with in the world of Xerox, who
also sub-contracted to AC Delco[1]. Every main control board I worked on
had some sort of NVM. Battery backed up on the early stuff, moving to
flash memory by late 1990s.

[1] General Motors