Eaton Fuller Hybrid Transmission ePTO Test Overview
The ePTO feature allows the diesel engine to remain off for extended periods of time during PTO usage. The DC/DC Converter is energized only in ePTO mode so it can charge the 12-volt battery system. The Hybrid Control Module (HCM) operates the Motor/Generator to power the transmission mounted PTO. If the high-voltage batteries get low, the HCM starts the engine with the Motor/Generator or the standard 12-volt system.
Select ePTO mode by pressing the Mode button on the Push Button Shift Control. Some applications use a Chassis or Body Controller to control the PTO and send information to the HCM. Other applications use the HCM to control and confirm engagement of the PTO. The Body Controlled option is referred to as the J1939 option and the HCM controlled is referred to as the Analog option.
Note: To determine which module is controlling the PTO, connect ServiceRanger and select the “Roadranger Configurations” screen. Under the Hybrid Control Module option is a listing for PTO Feedback, which is either Analog Controlled (HCM), or J1939 Controlled (Body Controller).
Note: This symptom-based test should only be performed as directed by a diagnostic procedure and you have no Active fault codes.
Eaton Fuller Hybrid Transmission ePTO Test Detection
The following symptoms may have been experienced:
- ePTO light does not illuminate when mode is selected.
- ePTO light flashes and the push button tone sounds.
- ePTO light is lit, but the hydraulic lift does not operate when the controls are used.
- ePTO light is lit, but the PTO pump fails to turn off after PTO usage.
- ePTO light is lit, but the diesel engine runs frequently or all the time.