Eaton Fuller Hybrid Transmission Gear Engagement Test Overview
Hybrid Control Module (HCM) normally commands the different gears shifts which are completed through the Transmission Electronic Control Unit (TECU). The HCM also controls the Electric Clutch Actuator (ECA), which changes the position of the clutch.
Note: This symptom-based test should only be performed if you were sent here from a diagnostic procedure and you have no Active fault codes.
Eaton Fuller Hybrid Transmission Gear Engagement Test Detection
The following symptoms may have been experienced:
- Transmission does not engage a gear from neutral and warning tone sounds (solid “N” in gear display).
- Transmission does not engage a gear from neutral (flashing gear in gear display). This symptom is addressed in the Front Box symptom test.
- Transmission does not move from a stop (solid gear number in gear display).