How to troubleshoot a pedal sensor?

[Hwy89]

I decided to try pedal assist on a new bike I just put together. It has a q100 rear motor, a S12SH sine wave controller and a LCD 5 display. Everything works just fine with the throttle but I can't get it to work with the pedal assist sensor that I just bought. The sensor mounted easily on the non drive (left) side of the bike. I made sure that the arrows on both the sensor and the magnet ring point in the direction of pedal rotation and the gap between the two is less than 1/16 of an inch.
I spent half the day today programming and re programming the L C D 5 with no results so I put my volt meter on the connection to the controller. Negative to positive reads 4.26 volts and negative to signal 1.4 volts but this is a steady state. The voltages do not change when the pedals are rotated forward backward or stopped. I have no idea what I should be seeing but I assume there should be a changing voltage coming from the sensor.
Unfortunately I don't have another sensor to compare with so I'm hoping to get some advice from the forum.

 

[amberwolf]

Most likely the magnet ring is not close enough to the sensor, or is on the wrong side of the sensor.

Take a separate magnet if you have one, and manually swipe it past the sensor in each direction while measuring the sensor.

Make sure the sensor is plugged into the controller at the time, as it probably requires a pullup resistor inside the controller to create the signal (usually these sensors just ground a 5v that's already on the line.

It could also be the signal wire broken between the connector and the controller.

 

[E-HP]

The connector may not have the same wiring order.

EDIT: I have a KT controller and PAS. When I upgraded to the dual hall KT PAS, I tried everything to get it to work. My mistake ended up being the assumption that a KT controller and KT PAS would have a compatible wiring order. https://endless-sphere.com/forums/viewtopic.php?f=2&t=99792&p=1461224#p1461224

 

[danielrlee]

After checking that the wires are connected in the correct order, verify that custom parameter 'C1' is set correctly, depending on the model of PAS sensor you have.

 

[Hwy89]

I bought a generic pas sensor from Amazon.com. It came without instructions. The connector is correct but the wire colors are all different than the controller plug. Will I do any damage if I randomly switch wires to determine the right combination?

 

[E-HP]

I bought a generic pas sensor from Amazon.com. It came without instructions. The connector is correct but the wire colors are all different than the controller plug. Will I do any damage if I randomly switch wires to determine the right combination?

I don't think it will hurt anything. It probably has already been connected in random order anyway.

 

[Hwy89]

Thank you E-HP, you were spot on.
A few wire swaps and many C1 programming changes and it works.

 

[E-HP]

Excellent! I'm glad it worked out. I recall it felt like magic when it finally worked for me. :thumb: