Fault Code | Possible cause | Action |
P1690 | Fault in CAN communication between ECM and other CAN nodes (Immobiliser unit, instruments and ABS module) | View & note 'freeze frame' data if available. Ensure ignition switch is in 'OFF' position. Proceed to pinpoint test 1. |
Pinpoint Test
Test | Result | Action |
1. Check cable and terminal integrity: ECM pin B28 ECM pin B27 Immobiliser pin 1 Immobiliser pin 6 Instrument pin 4 Instrument pin 5 ABS unit pin 1 Diagnostic connector pin 6 Diagnostic connector pin 14 | OK | Disconnect the 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 | Proceed to test 3 |
Faulty | Locate and rectify wiring fault, proceed to test 4 | |
3. Check cable resistance: ECM pin B28 to ECM pin B27 | More than 50 Ω | Contact Triumph service |
Faulty (short circuit or less than 50 Ω) | 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 |