Fault code for Eaton Hybrid Drive Systems models (MY08) EH-8E306A-U, EH-8E306A-UPG, EH-8E306A-UP, EH-8E306A-CD, EH-8E306A-T, EH-6E606B-CD, (MY09) EH-8E406A-U/P, EH-8E406A-UP, EH-8E406A-UPG, EH-8E406A-CD, EH-8E406A-CDG, EH-8E406A-CDR, EH-8E406A-T, EH-6E706B-CD, EH-6E706B-P and EH-6E706B-UPG. The High-Voltage Motor/Generator Assembly is connected to the Inverter Assembly through an AC High-Voltage Cable that contains 3 separate cables. During operation, the Inverter monitors the amperage in the AC cables through a current sensor, which is mounted inside the Inverter. The inductive sensor produces an output based on amperage present in the cables.
Fault Code 1 Motor/Generator Current Sensor Detection
The Inverter ignition voltage is greater than 7 volts and less than 16 volts.
Conditions to Set Fault Code Active
Conditions to Set Fault:
- FMI 6 is set when Inverter detects current input from the Motor/Generator greater than 100 amps for 150 MS.
- FMI 0 is set when the Inverter detects current input from the Motor/Generator greater than 200 amps for 0.3 MS.
- FMI 15 is set when the sensor offset is out of range at initial check.
Fallback When Fault Code 1 is set the following conditions occur:
• Amber “Check Hybrid” light illuminates.
• Fault is stored in Hybrid Control Module (HCM) memory.
• Electric Motor/Generator Assist and Regeneration are disabled; however, the high-voltage relays remain powered.
• HCM continues to control the hybrid vehicle in a diesel-only mode.
• Transmission defaults start gear to 1st.
Conditions to Set Fault Code Inactive
Only Inactive faults can be cleared from the Transmission Electronic Control Unit (TECU) or HCM history using ServiceRanger. The TECU automatically clears the faults from history after 200 hours and the HCM automatically clears the faults from history after the fault has stayed Inactive for 200 hours.
This fault code can be caused by any of the following:
- FMI 0, 6
- AC cable
- FMI 15