01-26-2018, 02:03 AM
(01-25-2018, 02:58 PM)Dave_imp Wrote: Hi Doc. First, you are correct, I mistakenly identified the Black/Yellow wire as Red/Yellow, sorry.
It appears that based on my voltage test results, my TPS is functioning normally – do you agree with this statement? I used the bike to run some errands the evening after I performed the TPS tests and it ran well - idling at 1,050 RPM at each stop. I rode about 12 miles, made three stops where I turned the engine off, and stopped about a dozen times at stoplights. Maybe disconnecting and reconnecting the TPS sensor improved a faulty connection? It’s too early to tell.
I went back and reread your posts; post #58 is describing a TPS resistance test. Is this test just confirming the voltage test results at the Black/Yellow wire? Connecting the VOM probes to the TPS while the TPS is installed on the bike will be very challenging. Can this resistance test be performed with the TPS connected to the wire harness?
The resistance tests you describe in post #59 sound pretty straight forward; I think the most difficult part will be removing the gas tank. I’ll try to perform the post #59 tests this weekend.
Thanks again for all your support, Doc, Max, and Popgun.
Yes, as best as can be determined remotely.
(01-25-2018, 02:58 PM)Dave_imp Wrote: Hi Doc. First, you are correct, I mistakenly identified the Black/Yellow wire as Red/Yellow, sorry.
It appears that based on my voltage test results, my TPS is functioning normally – do you agree with this statement? I used the bike to run some errands the evening after I performed the TPS tests and it ran well - idling at 1,050 RPM at each stop. I rode about 12 miles, made three stops where I turned the engine off, and stopped about a dozen times at stoplights. Maybe disconnecting and reconnecting the TPS sensor improved a faulty connection? It’s too early to tell.
I went back and reread your posts; post #58 is describing a TPS resistance test. Is this test just confirming the voltage test results at the Black/Yellow wire? Connecting the VOM probes to the TPS while the TPS is installed on the bike will be very challenging. Can this resistance test be performed with the TPS connected to the wire harness?
The resistance tests you describe in post #59 sound pretty straight forward; I think the most difficult part will be removing the gas tank. I’ll try to perform the post #59 tests this weekend.
Thanks again for all your support, Doc, Max, and Popgun.
Black/yellow is 5 vdc power to the sensor.
Resistance is measured between the sensor pins to which black/red signal output and black/green ground wire would be connected...but resistance is measured with the unit isolated/unplugged. I would probe by feel.
What the FSM does not state:
a. Operate the throttle while testing and look for a change from 1.5 K ohm high range (throttle closed = 0.5 vdc, when connected and powered) to 0.5 K ohm low range low range (throttle wide open = 5.5 vdc, when connected and powered). Key is off, TPS is disconnected.
b. Do the same test with ground connected to battery negative, instead of black/green pin, to determine if black/green is low resistance to ground.
The resistance test is redundant to the output signal voltage measurement. A smooth change is important.
(01-25-2018, 02:58 PM)Dave_imp Wrote: Hi Doc. First, you are correct, I mistakenly identified the Black/Yellow wire as Red/Yellow, sorry.
It appears that based on my voltage test results, my TPS is functioning normally – do you agree with this statement? I used the bike to run some errands the evening after I performed the TPS tests and it ran well - idling at 1,050 RPM at each stop. I rode about 12 miles, made three stops where I turned the engine off, and stopped about a dozen times at stoplights. Maybe disconnecting and reconnecting the TPS sensor improved a faulty connection? It’s too early to tell.
I went back and reread your posts; post #58 is describing a TPS resistance test. Is this test just confirming the voltage test results at the Black/Yellow wire? Connecting the VOM probes to the TPS while the TPS is installed on the bike will be very challenging. Can this resistance test be performed with the TPS connected to the wire harness?
The resistance tests you describe in post #59 sound pretty straight forward; I think the most difficult part will be removing the gas tank. I’ll try to perform the post #59 tests this weekend.
Thanks again for all your support, Doc, Max, and Popgun.
Not certain that is necessary, since you have 5 vdc to sensor and outputs are normal. However, for an intermittent issue, checking the wiring would be the final step.
This is my 3rd EFI bike, but I hesitate removing the tank due to concern for reconnecting the fuel line properly...it could leak or pop off. However, removal will be necessary for fully checking the IACV. Removal is page 5-55 of FSM.
Max: Please verify, but I understood you to think that no further testing, beyond resistance tests, are necessary, which would let us move on to the IACV...which has only one DTC:
29-1
Loose or poor contact
IACV or circuit issue
Symptoms are engine stalls, hard to start, rough idle.