Motor Heat Sensore Fault

[cartboy]

I have a 2015 RXV that goes into limp mode without any warning.

I get a motor heat sensor fault and an HPD Sequence fault.

Batteries all test fine.

Help!

Thanks

[HiTechRedNeck]

Never had failure with 2015--

Most temp sensor failure i have see was wire harness failure.
You can ohm out temp sensor .... Troubleshooting guide in stickies.

[cartboy]

Do you think the HPD Sequence fault is from what I had to do to get it back to the cart barn? I did a lot of turning the key off and back on and Tow mode and Run mode.

When the cart was in limp mode, it acted strangely. When I put it in Tow, it did not free-wheel, so could not be pushed or towed. In Tow it actually seemed to be still slightly powered . . . not as much as in limp mode, but still trying to go.

I've been using Tow mode on RXVs regularly since 2009 to get carts back and forth from a distant cart barn, so I am accustomed to how they act in Tow.

I was guessing wiring, maybe a bad connection.

I found the handheld diagnostic guide online, except it was TXT, not RXV. The solution was to replace the motor or controller.

[HiTechRedNeck]

TXT guide useless for RXV..

No free wheel could be failed motor brake.
Operating cart with failed brake could result in overheat.

Start by checking / replacing motor brake.

I Have NEVER seen bad RXV motor... Bearings - yes .... motor - no

[cgtech]

the problem is that the sensor is inside the motor windings and is not replaceable seperately. i think the ohm values are 400ohm hot, 1300ohm cold. when sensor fails, it usually shorts to 0 ohm, controller thinks motor is hotter than the sun & goes into limp mode.. if you wanted to be sneaky, you could just jam a 700ohm resistor into the temp sensor plug to fool the controller into thinking the motor temp is bueno.

[cartboy]

I believe our tech replaced the controller. The cart is back in service and has not failed.

[klinder@windstream.net]

Originally Posted by cgtech

the problem is that the sensor is inside the motor windings and is not replaceable seperately. i think the ohm values are 400ohm hot, 1300ohm cold. when sensor fails, it usually shorts to 0 ohm, controller thinks motor is hotter than the sun & goes into limp mode.. if you wanted to be sneaky, you could just jam a 700ohm resistor into the temp sensor plug to fool the controller into thinking the motor temp is bueno.

On the 2014 RXV you have the 4 wire harness, orange, black, white and Blue/White stripe. What wires do you connect the 700ohm resistor to?

[klinder@windstream.net]

Originally Posted by klinder@windstream.net

On the 2014 RXV you have the 4 wire harness, orange, black, white and Blue/White stripe. What wires do you connect the 700ohm resistor to?

The cart is throwing code, Motor sensor fault.. Replaced the probe, had motor cleaned and new encoder installed, new controller installed, and toned all 4 wires from plug at motor to controller. Which were good. but still just get jerk and same code. Thought I would try the resistor to see if it was the sensor in the motor.

[treyclash13]

Customer sprayed cart with a pressure washer.... cart has been sitting for 2 days after replacing brake solenoid and controller. plug in a handheld and motor is reading 145c. move the cart shoots to 155 and shuts off. motor is cool to the touch......

[treyclash13]

Update: Replaced motor temps still going above 200c without even running the cart. The 2 wire going to the motor is for the Temp sensor. It is NOT in the 4 wire connector. Connector was very brittle. Connected the wires together outside the connector and it fixes it. Going to do a permanent fix on those wires tomorrow and hopefully that's it.