| Fault Code | Possible cause | Action |
| C1661; C1662 | Power supply circuit fault Battery charging circuit fault | Ensure ABS ECM connector is secure. Disconnect ABS ECM connector and proceed to pinpoint test 1: |
Pinpoint Tests
| Test | Result | Action |
| 1. Check cable and terminal integrity: ABS ECM connector pin 16 and Ground pin 24 | OK | Proceed to test 2 |
| Faulty | Rectify fault, proceed to test 5 | |
| 2. Check the cable for continuity: ABS ECM connector pin 24 and Ground | OK | Proceed to test 3 |
| Faulty | Rectify wiring harness fault, proceed to test 5 | |
| 3. Check battery voltage: With ignition 'ON', Check the voltage between: ABS ECM connector pin 16 and Ground pin 24 | Voltage greater than 10 V | Proceed to test 4 |
| Voltage less than 10 V | Locate and rectify fault, proceed to test 5 | |
| 4. Check battery voltage: Reconnect ABS ECM connector and start the engine, Check the voltage between: Battery positive (red) terminal and negative (black) terminal | Voltage between 10 V and 16 V | Proceed to test 4 |
| Voltage greater than 16 V | Check the battery charging circuit. Locate and rectify fault, 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 |
Circuit Diagram
