Hi Hubb:
Welcome.
Re: Ohms testing a carb'd bikes TPS.
From what you state in your post, you're actually doing the test wrong.
Test procedure below:
Ohms testing any electrical component is to determine if it's outside of manufactures specs ie) Open circuit / high resistance.
All components under Ohms test must be unplugged.
Ignition pickup coil = (248 ~ 372ohms) unplugged, test across 2 pin connector behind right side panel near fuel pump.
TPS = (4~6Kohms) unplugged.
Ohms test is a static test, you gain nothing by rotating a tps during an Ohms test.
Set meter on 20K Ohms, touch leads together for a few seconds, what does display read?
Any resistance displayed is in the meter/leads & must be deducted from components tested value.
Connect multi-meter (Black/Negative) test lead to TPS Blue wire & meters (Red/Positive) test lead to TPS Yellow.
Display should read (4~6Kohms), if in spec, continue to DCV test TPS, if out of spec, replace TPS.
Voltage Test TPS:
Since TPS is a basic rotating 3 wire potentiometer it needs volt testing in motion to verify a fault.
Fully charge battery before any Volt testing.
Cold test first, then run motor up to temp, retest & compare values.
Connect TPS back up to bikes loom.
Set meter to DCV.
Touch meter leads together for a few seconds to zero meter.
Avoid touching meter lead ends, some meters pick up body voltage.
Connect meter (Black/Negative) lead to battery Negative.
back probe at 3 pin connector with TPS plugged into loom).
Turn ignition "ON".
Back probe TPS plug on Blue & Yellow wires, one of these should be a 5v reference, use the other wire that is the signal wire to test TPS.
Throttle closed, what does meter display = ? DCV, should be around 0.2v ~ 0.5v
Slowly open throttle up to full throttle, display voltage should increase to around 4.5v, any sudden drops or jumps, TPS is faulty, it's usually dirt ingress up the shaft that causes a TPS to play up.
I use a small Ultrasonic cleaner for jewellery, ideal for sensors & injectors, use stainless lockwire to suspend TPS with shaft end upwards, often get a good amount of crap out of em, sometimes this sorts em, sometimes not, suck it n see deal.
Hope the above helps?
Welcome.
Re: Ohms testing a carb'd bikes TPS.
From what you state in your post, you're actually doing the test wrong.
Test procedure below:
Ohms testing any electrical component is to determine if it's outside of manufactures specs ie) Open circuit / high resistance.
All components under Ohms test must be unplugged.
Ignition pickup coil = (248 ~ 372ohms) unplugged, test across 2 pin connector behind right side panel near fuel pump.
TPS = (4~6Kohms) unplugged.
Ohms test is a static test, you gain nothing by rotating a tps during an Ohms test.
Set meter on 20K Ohms, touch leads together for a few seconds, what does display read?
Any resistance displayed is in the meter/leads & must be deducted from components tested value.
Connect multi-meter (Black/Negative) test lead to TPS Blue wire & meters (Red/Positive) test lead to TPS Yellow.
Display should read (4~6Kohms), if in spec, continue to DCV test TPS, if out of spec, replace TPS.
Voltage Test TPS:
Since TPS is a basic rotating 3 wire potentiometer it needs volt testing in motion to verify a fault.
Fully charge battery before any Volt testing.
Cold test first, then run motor up to temp, retest & compare values.
Connect TPS back up to bikes loom.
Set meter to DCV.
Touch meter leads together for a few seconds to zero meter.
Avoid touching meter lead ends, some meters pick up body voltage.
Connect meter (Black/Negative) lead to battery Negative.
back probe at 3 pin connector with TPS plugged into loom).
Turn ignition "ON".
Back probe TPS plug on Blue & Yellow wires, one of these should be a 5v reference, use the other wire that is the signal wire to test TPS.
Throttle closed, what does meter display = ? DCV, should be around 0.2v ~ 0.5v
Slowly open throttle up to full throttle, display voltage should increase to around 4.5v, any sudden drops or jumps, TPS is faulty, it's usually dirt ingress up the shaft that causes a TPS to play up.
I use a small Ultrasonic cleaner for jewellery, ideal for sensors & injectors, use stainless lockwire to suspend TPS with shaft end upwards, often get a good amount of crap out of em, sometimes this sorts em, sometimes not, suck it n see deal.
Hope the above helps?