| Fault code No. | 12 |
| Symptom | Normal signals are not received from the crankshaft position sensor. |
| Fail-safe action | Engine startup: Impossible |
| Riding: Impossible | |
| Diagnostic monitoring code No. | |
| Meter display | |
| Checking method |
| Item/components and probable cause | Check or maintenance job | Sensor inspection procedure | |
| 1 | Connection of crankshaft position sensor coupler. Check the connection of the coupler is secure. Remove the coupler, and check each pin (for bending, wear, or locking). | Poor connection → Connect it securely, or repair/replace the wire harness. | Crank the engine, and check the fault code indication. No fault code indicated. → Recovered. Fault code indicated. → Check the next step. |
| 2 | Connection of main harness ECU coupler. Check the connection of the coupler is secure. Remove the coupler, and check each pin (for bending, wear, or locking). | Poor connection → Connect it securely, or repair/replace the wire harness. | Crank the engine, and check the fault code indication. No fault code indicated. → Recovered. Fault code indicated. → Check the next step. |
| 3 | Continuity of wire harness | Open or short circuit → Replace the wire harness. Gray-Gray Black/Blue-Black/Blue | Crank the engine, and check the fault code indication. No fault code indicated. → Recovered. Fault code indicated. → Check the next step. |
| 4 | Sensor installation status: Check the mounting section for loose or pinched mounting. | Incorrect installation → Reinstall or repair the sensor. | Crank the engine, and check the fault code indication. No fault code indicated. → Recovered. Fault code indicated. → Check the next step. |
| 5 | Crankshaft position sensor malfunction | Sensor inspection procedure. Refer to "Checking the crankshaft position sensor". | Crank the engine, and check the fault code indication. No fault code indicated. → Recovered. Fault code indicated. → Check the next step. |
| 6 | ECU malfunction | Replace the ECU. |
If fault codes 13 and 14 are indicated simultaneously, take the actions specified for fault code 13 first.