Fault Code | Possible cause | Action |
C1621 | Incorrect Wheel speed sensor air gap Damaged or dirty pulser ring Loose or incorrectly installed wheel speed sensor Damaged/incorrect wheels | Ensure ABS ECM connector is secure. Proceed to pinpoint test 1: |
Pinpoint Tests
Test | Result | Action |
1. Measure the air gap of the front wheel speed sensor between the sensor and the pulser ring: Air gap between 0.1 mm to 1.5 mm | OK | Proceed to test 2 |
Faulty | Rectify the fault and proceed to test 5 | |
2. Check the pulser ring for damage or contamination by road grime or ferrous metal filings | OK | Proceed to test 3 |
Faulty | Clean or replace the ABS pulser ring, proceed to test 5 | |
3. Check the wheel speed sensors for correct installation, and the fixings for correct torque: | OK | Proceed to test 4 |
Faulty | Rectify the fault and proceed to test 5 | |
4. Check the motorcycle wheel for damage/incorrect size | OK | Proceed to test 4 |
Faulty | Rectify the fault and proceed to test 5 | |
5. Clear fault code and test ABS to verify fault cleared | OK | Action complete - quit test |
Fault still present | Contact Triumph service |