Re: TPS sensor
set the TPS to the specified voltage. the 93 models were about .56 volts plus or minus about .02 volts.the 97 models usually set about the same with the throttle shutter fully closed then reset the idlespeed screw to about .62V and your idle speed will be close. the TPS controls the ign timing and the fuel injectin cycle for acceleration and deacceleration. you must use a digital meter.<br /> your WOT voltage seems about right. the 5 volts is a reference voltage generated by the ECU. the TPS pick off, the one your measuring, is a feed back from the pick off wiper on the resistor. I dont have my service manuals he in Caracas and today I just got back from Rio Chico and at 5am I leave for lake Guri to attempt some pavon and payara.<br /> the correct procedure is in the service manual and will require the idle screw to be backed off,count the turns, and the voltage set. there may be a tech bulliten on that model I cant remember.<br /> normal cause of fouling plugs is dirty or defective O2 senor. needs periodic maint, bad low pressure pumps or a bad resistor cap on the spark plug, normal cause of high speed power loss is low fuel presure on the 35PSI rail due to a clogged VST filter bad low pressure pumps or a fuel restriction between the low presure pumps and the liquid in the gas tank.<br /> sounds like someone needs to do a bit of studying how and why EFI and the feed back sensors work, parts are very expensive for yamahas.<br /> a quick test to verify the tps is with a timing light, if the timing advances to about 21 degrees or so, or whatever the manual says, at WOT. a bad CPS will create power loss issues but will lock the timing. there is a chart and its posted here someplace if the search function works about what trouble codes do what with the idle and WOT timing and fuel control. if the O2 sensor is dirty or the draw tube clogged they tend to run rich at idle and burn #1 piston above 4000 RPM. to attepmt to test this system you will need a diagnostic lamp, a high pressure fuel gauge, the O2 sensor test harness and the tune up spec guide.its an incredibly simple system that will test itself if you let it.<br />so far I have not seen anything posted on your TPS values that I would consider a problem. remember that throttle shutters fully closed means removing the link rod or loosening all the screws and making sure the shutter is in the fully closed position.
