CAT 3406E (Prefix 1MM or 2WS) Fault Code: 28 PID: SPN: 91 FMI: 13 Throttle Sensor out of calibration
The ECM detects the following conditions:
•The duty cycle for the accelerator pedal position sensor is less than 5 percent or the duty cycle is greater than 95 percent for more than two seconds.
•The ECM has been powered for at least three seconds.
Probable Causes:
1) ECM Connection/Harness
2) Accelerator Position Sensor
3) Accelerator Position Sensor Harness
4) ECM Failure
![Volvo Penta EPC 6 Offline VMware [12.2021] VMware](https://i0.wp.com/www.ecuforcetruck.com/wp-content/uploads/2022/11/VOLVO-PENTA-2021-A.jpg?resize=300%2C300&ssl=1)
