Eaton Fuller Advantage (2017) Fault Code: 33 PID: SPN: 168 FMI: 4 Low Battery Voltage Supply: Voltage Below Normal or Shorted Low
Overview:
Fault Code 33 sets Active if battery voltage to the TECU falls below 7 volts for more than 1 second.
Detection:
The Transmission Electronic Control Unit (TECU) monitors the battery voltage supplied to the TECU after completing power up. Fault Code 33 sets Active if battery voltage to the TECU falls below 7 volts for more than 1 second. Fault Code 33 represents a more severe drop in battery voltage than Fault Code 34, Weak Battery Voltage Supply, which sets Active below 9 volts.
Conditions to Set Fault Code Active:
FMI 4 – Voltage Below Normal or Shorted Low: TECU monitors battery voltage of the vehicle. If the voltage falls below 7 volts for more than 1 second, the fault sets Active.
Fallback:
FMI 4
• “F” flashes in gear display.
• Service light flashes (if equipped).
• Engine may not crank.
• Transmission may not engage a gear from neutral.
• Transmission may not attempt to shift.
• Until the fault becomes Inactive, driver may have to shut off engine with transmission in gear.
Conditions to Set Fault Code Inactive:
FMI 4: Battery voltage stays at 7 volts or greater for more than 1 second.
Possible Causes:
FMI 4
1) Vehicle Power Supply
– Wiring shorted to ground, shorted to power or open
– Terminals bent, spread, corroded or loose
– In-line fuse corrosion, loose connection or blown fuse
2) Vehicle Batteries
– Internal failure
3) Vehicle Charging System
– Charging system failed
4) TECU
– Internal failure
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