SV650 Sk3 TB STP Sensor Resistance Reading Query

[madcockney]

Has anyone taken the actual readings? Both Haynes and the official service manual state that the resistance should be 0.58 K ohm with the TB STV closed and 4.38 K ohm with the STV fully open. I was getting approx 0.96 and 4.32 K ohm. I could not get it to go much below the 0.96 and when I adjusted to an STV open setting of 4.38 K Ohm the shut reading went to 1 K Ohm.

What I don't know is whether this part was amended at a later date and has a higher and lower setting, though I cannot find anything indicating this on-line or on the up to date Parts Fiche. There is a sticker on the STP Sensor showing 023320 which I assume is a stock item or internal number of some sort as the part number is 13580-16G00 and is shared with:

SV650/SV650S 2003-2006
DL6500 2003-2004
SV1000 2003 - 2007

Any help will be greatly appreciated

If I need to purchase a new replacement then this is expensive, so will need to hunt around.

[Sid Squid]

Just to clarify the situation, rather than looking for specific readings, what is the fault with the bike that leads you to ask?

[madcockney]

Hi Sid Squid,

There is a long story behind this, but I'll precis as much as possible. After undertaking some work on the bike, including a full service that included replacing the coolant, oil, and hydraulic fluids completely,and a bit of a lay up due to weather, etc., the starter would not run. Turned out to be the starter motor so I stripped and got it working, but on the bike it was intermittent in trying to run so I stripped down the starter switch assembly completely and discovered some gooey gunge in part of it. This I got working and the starter ran and motor started, but very lumpy. ( I had replaced the small amount of fuel in the tank earlier in this period after the lay up.)

I checked that I had not dislodged anything when I removed one of the injectors to make it easier to fit the TB sync extension pipes and that the vacuum pipes were OK. Checked that I had reseated the spark plugs and caps properly, as well as the injector though I have not replaced the injector to TB sealing ring with a new one. So tried to sync to see if that was the issue but could not get them to sync so after research found out that this could be the TB STVs not being synchronised. Using a digital vernier I found that they were out and so synchronised them. Anyway part of this procedure is too check the STVA and the STP sensor and both Suzuki and Haynes says that the STP resistance is critical, but I know that on my bike the resistance of the STVA servo is 19.6 ohms whereas the manuals state a maximum of 14 ohms and this could be indicative to a change by Suzuki of the resistance of both the STVA and the STP sensor. Hence the question.

I know, according to the wiring diagram, that the STP sensor reports to the ECU which controls the STVA so there may be some latitude there, but it would appear that the ECU receiving signal is based on voltage variation which could be critical. That's the stage I am at and yet to check the bike whether the TB STV sync has actually sorted the issue. I had checked, prior to the TB STV sync, putting the ECU into dealer mode and was only getting C-00 so there were no issues but my understanding is that this only reports back a no signal situation and not a malfunctioning signal.

Prior to this I was suspicious that the bike was a bit "off" but never had a starting issue, or running in a really lumpy way. I cannot ever recall on a cold start, even during winter time, the revs reaching 1800-2000, more like 1500-1600, but I could be wrong and down to age and a bad memory. When I got the bike a few years back it had been fitted, and still is, with a "Fuel" road legal stainless can.

The bike is located away from home in a rented garage with no power, and a low ceiling so I have only limited facilities and daylight. I use a 72 AH 12 volt car battery with a LED strip light to work on the bike, and have two bike batteries which I rotate, taking one home to top up so that I always have a fully charged battery on the bike or immediately available.