| Fault Code | Possible cause | Action |
| P0444 | Open circuit or short circuit to earth | View & note diagnostic tool "sensor" data. Ensure purge valve connector is secure. Disconnect ECM and proceed to pinpoint test 1 |
| P0445 | Short circuit to battery+ | Disconnect purge valve and proceed to pinpoint test 5 |
Pinpoint tests
| Test | Result | Action |
| 1 Check cable and terminal integrity: - ECM pin B31 | OK | Proceed to test 2 |
| Faulty | Rectify fault, proceed to test 7 | |
| 2 Check resistance value: - ECM pin A20 to ECM pin B31 | 24Ω to 28Ω | Disconnect purge valve and proceed to test 3 |
| Open circuit | Proceed to test 4 | |
| Short circuit | Disconnect purge valve and proceed to test 5 | |
| 3 Check cable for short circuit: - ECM pin B31 to earth | OK | Proceed to test 7 |
| Short circuit | Locate and rectify wiring fault, proceed to test 7 | |
| 4 Check cable continuity: - ECM pin B31 to valve pin 2 - ECM pin A20 to valve pin 1 | OK | Proceed to test 6 |
| Open circuit | Locate and rectify wiring fault, proceed to test 7 | |
| 5 Check cable for short circuit: - ECM pin A20 to ECM pin B31 | OK | Proceed to test 6 |
| Short circuit | Locate and rectify wiring fault, proceed to test 7 | |
| 6 Check purge valve resistance: - Valve pin 1 to valve pin 2 | 24Ω to 28Ω | Proceed to test 7 |
| Faulty | Renew purge valve, proceed to test 7 | |
| 7 Reconnect harness, clear fault code and run diagnostic tool function test to visually verify operation of purge valve | OK | Action complete - quit test |
| Fault | Contact Triumph service |
Circuit diagram
