Fault Code | Possible cause | Action |
P1521 | Fault in CAN communication between ECM and ABS modulator | View & note 'freeze frame' data if available. Ensure ABS modulator connector is secure. Proceed to pinpoint test 1: |
Pinpoint Test
Test | Result | Action |
1. Check cable and terminal integrity: ECM pin B28 ECM pin B27 ABS modulator pin 1 ABS modulator pin 17 | OK | Disconnect ECM and proceed to test 2 |
Faulty | Rectify fault, proceed to test 4 | |
2. Check cable for short circuit: ECM pin B28 to ground ECM pin B27 to ground | OK | Disconnect ABS modulator and proceed to test 3 |
Faulty | Locate and rectify wiring fault, proceed to test 4 | |
3. Check cable continuity: ECM pin B28 to ABS modulator pin 1 ECM pin B27 to ABS modulator pin 17 | OK | Contact Triumph service |
Fault still present | Locate and rectify wiring fault, proceed to test 4 | |
4. Reconnect harness, clear fault code and run engine | OK | Action complete, quit test |
Fault still present | Contact Triumph service |