May also need to calibrate Jag and see if you get the expected results. to calibrate you will need full forward and full reverse speeds.
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To calibrate the servo-style PWM input for a specific range, connect a PWM source, then:
1. Hold down the USER switch with a straightened paper clip for 5 seconds.
2. The LED flashes Red and Green to indicate Calibration mode.
3. Instruct the controller to send a full-forward signal for one or more seconds.
4. Instruct the controller to send a full-reverse signal for one or more seconds.
5. The LED flashes Green and Yellow quickly to indicate a successful calibration.
The Jaguar samples these signals and centers the speed range and neutral position between these limits. A
calibration failure signals if an out-of-range signal is detected. This condition is indicated by flashing the LED
Red and Yellow
http://content.vexrobotics.com/docs/...artedGuide.pdf