Eaton Fuller Advantage (2017) Fault Code: 13 PID: SPN: 751 FMI: 8 J1939 Shift Control Device: Abnormal Frequency

Overview:
The Fuller Advantage transmission may be equipped with a J1939 Shift Control Device. This version of the Shift Control Device uses the J1939 Data Link to broadcast the driver’s shift request to the Transmission Electronic Control Unit (TECU). The system includes redundant neutral request and neutral confirmation signals hard-wired between the Shift Control Device and TECU. These redundant signals allow the transmission to achieve neutral if the J1939 Data Link fails.

Fault Code 13 indicates that either the TECU lost J1939 Data Link communications with the Shift Control Device or that the neutral request status received over J1939 and the neutral request status received through the hard-wired signal do not match.

Detection:
The ignition key is on and the TECU has not detected any low battery system faults.

Conditions to Set Fault Code Active
FMI 8 – Abnormal Frequency: TECU compares the J1939 Data Link message from the Shift Control Device to the hard-wired neutral signal request. When 10 consecutive messages do not match, the fault code sets Active.

Fallback:
FMI 8
• “F” flashes in gear display.
• Service light flashes (if equipped).
• Engine may not crank.
• Transmission may not engage a gear from neutral

Conditions to Set Fault Code Inactive:
All FMIs: TECU receives a valid message over the J1939 Data Link.

Possible Causes:
1) Vehicle Harness
2) Bent, spread or loose terminals
3) Wiring shorted to ground, shorted to power or open
4) Shift Control Device
5) Internal failure