A) Speed sensor should sit parallel with the flywheel and gap between speed sensor and flywheel should be within 1/16". Adjust speed sensor if necessary.
B) Inspect speed sensor connector to relay board. Check for pushed pins or loose wires. Repair or replace speed sensor assembly if necessary.
C) Inspect upper harness or display cable connector to relay board. Check for pushed pins or loose wires, giving specific attention to pin 5 (brown) and pin 9 (green). Repair or replace display cable if necessary.
D) Inspect speed control wiring:
- Checking purple wire from V+ on pwm board to P3 on the relay board
- Checking orange wire from P1 on pwm board to P1 on the relay board
- Checking brown wire from P2 on pwm board to P2 on the relay board
- Confirm P3 on pmw board has no connection
Correct speed control wiring if necessary.