| Fault code No. | 40 | |
| Symptom | Open or short circuit of secondary injector lead | |
| Fail-safe action | Engine startup: Possible (depending on the number of failed cylinders) | |
| Riding: Possible (depending on the number of failed cylinders) | ||
| Diagnostic monitoring code No. | D:40 D:41 D:42 D:43 | |
| D:40 | Actuator operation | Actuates the secondary injector #1 five times at one-second intervals. Illuminates the engine trouble warning light. |
| Checking method | Check the operating sound of the secondary injector #1 five times. | |
| D:41 | Actuator operation | Actuates the secondary injector #2 five times at one-second intervals. Illuminates the engine trouble warning light. |
| Checking method | Check the operating sound of the secondary injector #2 five times. | |
| D:42 | Actuator operation | Actuates the secondary injector #3 five times at one-second intervals. Illuminates the engine trouble warning light. |
| Checking method | Check the operating sound of the secondary injector #3 five times. | |
| D:43 | Actuator operation | Actuates the secondary injector #4 five times at one-second intervals. Illuminates the engine trouble warning light. |
| Checking method | Check the operating sound of the secondary injector #4 five times. | |
| Item/components and probable cause | Check or maintenance job | Sensor inspection procedure | |
| 1 | Locate the malfunction | Check in the diagnostic mode (Code No. 40, 41, 42, 43). Refer to "Checking the fuel injectors". | |
| 2 | Connection of secondary injector 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. | Check the injector's operating noise by the diagnostic mode (Code No.40-43). Injector's operating noise → Reset with the diagnostic code 63. Recovered. No injector's operating noise → Check the next step. |
| 3 | Secondary injector malfunction | Refer to "Checking the fuel injectors". Fuel injection inspection method. | Check the injector's operating noise by the diagnostic mode (Code No.40-43). Injector's operating noise → Reset with the diagnostic code 63. Recovered. No injector's operating noise → Check the next step. |
| 4 | 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. | Check the injector's operating noise by the diagnostic mode (Code No.40-43). Injector's operating noise → Reset with the diagnostic code 63. Recovered. No injector's operating noise → Check the next step. |
| 5 | Connection of sub-wire harness. 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. | Check the injector's operating noise by the diagnostic mode (Code No.40-43). Injector's operating noise → Reset with the diagnostic code 63. Recovered. No injector's operating noise → Check the next step. |
| 6 | Continuity of wire harness | Open or short circuit → Replace the wire harness. Secondary injector #1 Red/Blue-Red/Blue White/Blue-White/Blue Secondary injector #2 Red/Blue-Red/Blue Sky blue/White-Sky blue/White Secondary injector #3 Red/Blue-Red/Blue Brown/Yellow-Brown/Yellow Secondary injector #4 Red/Blue-Red/Blue Brown/Black-Brown/Black | Check the injector's operating noise by the diagnostic mode (Code No.40-43). Injector's operating noise → Reset with the diagnostic code 63. Recovered. No injector's operating noise → Check the next step. |
| 7 | ECU malfunction | Replace the ECU. |