| 0-4% |
Valid OFF duty cycle. |
The fuel pump control module sends a 60% duty cycle signal on the FPM circuit. The fuel pump is OFF. |
| 4-18% |
Invalid OFF duty cycle. |
The fuel pump control module sends a 20% duty cycle signal on the FPM circuit. The fuel pump is OFF. |
| 18-80% |
Normal operation. |
The fuel pump control module operates the fuel pump at the speed requested. FP duty cycle times 1.43 minus 14.29 equals pump speed % of full ON. For example, FP duty cycle equals 42%. 42 times 1.43 minus 14.29 equals 46 (rounded). Pump is run at 46% of full ON. The fuel pump control module sends a 60% duty cycle signal on the FPM circuit. |
| 80-86% |
Normal operation. |
The fuel pump control module operates the fuel pump at full ON. The fuel pump control module sends a 60% duty cycle signal on the FPM circuit. |
| 86-95% |
Invalid OFF duty cycle. |
The fuel pump control module sends a 20% duty cycle signal on the FPM circuit. The fuel pump is OFF. |
| 95-100% |
Valid OFF duty cycle. |
The fuel pump control module sends a 60% duty cycle signal on the FPM circuit. The fuel pump is OFF. |