Re: [ST] Idle problem after refuelling and short journey

["Keith Winter" <kwinter@xxxxxxxxxxxxx>]

Brian,

Pasted below is a note the list received directly from Triumph in 
January of 2000 regarding this issue.  Regardless what makes sense to 
you, this is how the ECM operates at shutdown.

- -Keith
'00 RS

On 13 Nov 2001, at 20:33, Brian Michaud wrote:

> Neil,
>     Whoever told you this gibberish apparently the never traced the
> electrical path via the schematic in the service manual. The signal that
> travels from the ignition switch to the ECM goes through the kill switch
> and the connector for the alarm before reaching the ECM. Furthermore the
> ECM doesn't remember what you last had for sensor inputs. Why would it
> care except for trouble codes. Does it matter that the last time the
> engine was running its coolant was a certain value? Only if it generated
> an error. If the kill switch could generate an error it would have been
> caught when the original engineer conducted a FMEA (Failure Mode Effect
> Analysis).
> 
> Brian 99 ST


> From:           	Ross Clifford <ross.clifford@xxxxxxxxxxxxx>
> To:             	"'ST@xxxxxxxxxxxxxx'" <ST@xxxxxxxxxxxxxx>
> Subject:        	Power down
> Date sent:      	Tue, 25 Jan 2000 08:30:31 -0000
> Send reply to:  	ST@xxxxxxxxxxxxxx
> 
> Dear All,
> 
> I have been reading with interest your recent tread on the power down
> procedure in relation to using the ignition switch or the kill switch.
> 
> The correct procedure is to use the ignition switch, the reason for this
> is that there is a relay set in the ECM circuit when you turn off the
> ignition the relay powers the ECM for a few seconds and takes readings
> for the sensors around the engine such as throttle position, the air
> bypass setting, crank position etc. This information or reference point
> is used by the ECM when you next start your engine. Hence the reason the
> manual tells you not to touch the throttle when starting as the ECM does
> it all for you because it has all the sensor readings from when the
> engine last idled prior to it being turned off by the ignition. Using
> the kill switch cuts all power to the ECM and thus takes no readings,
> the kill switch is really for emergencies only. Some of you may notice
> that when you use the kill switch the next time you start the engine it
> needs to crank over a few times before it will fire, This is because the
> ECM has no reference points and is taking them while it's cranking. Also
> some people say that the bike runs erratic for no reason, unless there
> is a fault this is almost certainly down to using the kill switch and
> the simple cure is to turn the engine off (With the ignition switch) for
> a seconds then turn it on and hit the starter and let the ECM do the
> rest for you.
> 
> Hope that clarifies the question, best regards
> 
> Ross


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