Fault Code | Possible cause | Action |
P1685 | EMS main relay circuit fault | Note that the starter motor cannot be powered if a main relay fault exists. Ensure the EMS main relay connector is secure. Proceed to pinpoint test 1: |
Pinpoint Tests
Test | Result | Action |
1. Ensure ignition has been switched off for greater than one minute. Identify EMS Main Relay on the harness. Check that relay operates when the ignition is switched ON. | OK | Proceed to test 2 |
Faulty | Disconnect ECM and proceed to test 4 | |
2. Check fuse box Fuse 6 integrity | OK | Disconnect ECM and proceed to test 4 |
Faulty | Disconnect ECM and proceed to test 3 | |
3. Check cable for short circuit: ECM pin A06 to ground EMS Main relay pin 3 to ground | OK | Replace Fuse 6 and proceed to test 4 |
Short circuit | Locate and rectify wiring fault, replace Fuse 6 and proceed to test 7 | |
4. Check cable and terminal integrity: ECM pin A06 ECM pin B15 EMS Main Relay pin 1 EMS Main Relay pin 2 EMS Main Relay pin 3 EMS Main Relay pin 5 | OK | Disconnect Main Relay and proceed to test 5 |
Faulty | Rectify fault, proceed to test 7 | |
5. Check cable for short circuit: ECM pin B15 to ground | OK | Proceed to test 6 |
Short circuit | Locate and rectify wiring fault, proceed to test 7 | |
6. Check cable continuity: ECM pin A06 to EMS Relay pin 5 ECM pin B 15 to Relay pin 1 EMS Main Relay pin 2 to ground EMS Main Relay pin 3 to Fuse box Fuse 6 | OK | Replace EMS Main Relay and proceed to test 7 |
Open circuit | Locate and rectify wiring fault, proceed to test 7 | |
7. Reconnect harness, clear fault code. Switch ignition off for longer than one minute. Switch ignition on and check that the EMS main relay operates. Start engine as final check | OK | Action complete - quit test |
Fault still present | Contact Triumph service |