tps evaluating for ii issues

[SportsterDoc]

Bottom line is that readings are normal.

FYI re color names: First color is sold/second color is stripe

From the Honda FSM I am referencing, colors are black/yellow = power, black/red = signal and black/green = ground at the TPS connector. I am not aware if there is a difference for model years.

Comments on your tests:

Power on, sensor connected:
1. Red/Yellow should be black/yellow (power) : Throttle fully closed = 4.8 VDC. Throttle fully open = no change (normal 4.75 to 5.25)

2. Red/Black should be black/red (output signal): Throttle fully closed = .5 VDC. Throttle fully open = 4.4 VDC. (normal 0.5 to 4.5, with smooth transition)

3. Green/Black should be black/green (ground): 0 vdc (not a FSM test.

Power on, sensor disconnected
1. Red/Yellow should be black/yellow = 4.8 VDC. (normal 4.75 to 5.25)

2. Red/Black should be black/red = 0.0 VDC (normal)

3. Green/Black= 0.0 VDC (normal)

Next steps, before discounting TPS as an issue:

B & C (key off) are getting more involved and not as easy to access.

A. Measure resistance of ground wire black/green (pin 1 [left] facing connector with locking tab up) in connector, to battery negative post.

B. Measure resistance of power wire black/yellow (pin 3), which leaves the 10 pin connector as yellow/red to ECM A9

C. Measure resistance of signal black/red Pin 2-center), which leaves the 10 pin connector as red/yellow to ECM B17

If resistances are about 0.1 ohm, then a TPS issue would be dismissed.

You may not be excited about doing B & C and I am not pushing you, but the number of electrical issues I have found (direct and remote) due to broken/partially broken wires and loose connections over the years has been rather high.

If you choose to pass, I am inclined to start checking out the IACV, next.