1 Another Hall sensor question... Mon Aug 10, 2015 5:02 pm
Dai
Life time member
I've been working on a K100LT and have run into a now non-firing situation. At some time in the past a PO has seriously bodged the shielded cable that goes from the ignition module to the hall sensor assembly (bodged as in cut the outer sheathing off, removed the shielding and then wrapped the shielding spiral-wise back along the length of the cable...). This looked like a simple-enough repair as in cut the original bodged cable out from the ignition module to the black plug, then using the correct crimp pins at the IM end and the black plug end, fit a new section of OEM shielded cable. So far, so simple.
Well, maybe. The bike won't start. Continuity from socket to plug is correct. There is also continuity and power down to the HE sensors. Fuel is being pumped (ask my jeans how I know...). The spark plugs are dry, suggesting that there is no signal from the ignition module to the FICU.
Using an analogue multimeter I checked the brown (signal) to red (positive) and cranked the engine. The meter flicked about 1.25v as expected. The same test on the orange (other signal) left the meter indicating infinity - no movement at all. That suggests that just one Hall sensor has gone awol. Reasonable assumption but... if just one HE has gone awol, why am I not getting fuel through to the engine and sparks on two out of the four plugs?
Question asked by Puzzled of Tunbridge Wells.
Well, maybe. The bike won't start. Continuity from socket to plug is correct. There is also continuity and power down to the HE sensors. Fuel is being pumped (ask my jeans how I know...). The spark plugs are dry, suggesting that there is no signal from the ignition module to the FICU.
Using an analogue multimeter I checked the brown (signal) to red (positive) and cranked the engine. The meter flicked about 1.25v as expected. The same test on the orange (other signal) left the meter indicating infinity - no movement at all. That suggests that just one Hall sensor has gone awol. Reasonable assumption but... if just one HE has gone awol, why am I not getting fuel through to the engine and sparks on two out of the four plugs?
Question asked by Puzzled of Tunbridge Wells.
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1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
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