Overview:
The Fuller Advantage Transmission Electronic Control Unit (TECU) communicates with the engine ECU over the J1939 Data Link. During every shift, the TECU receives speed and torque information from the engine and requests changes in speed or torque from the engine to synchronize shifts. If the engine does not respond to speed or torque commands and no J1939 communication fault codes are present, the fault is set.

This fault can also be set if the TECU or engine ECU configuration settings are not correctly matched.

Detection:
TECU monitors the net torque output and calculates the synchronization speed required to shift efficiently. If the request is sent to increase or decrease engine torque or speed and the engine does not respond or does not respond fully, the fault is set. Incorrect engine or transmission configuration settings can also set this fault code.

Conditions to Set Fault Code Active:
FMI 13 – Out of Calibration: TECU receives the required engine message but is not configured for the correct transmission model

Fallback:
FMI 13
• Transmission may not be able to complete a shift

Conditions to Set Fault Code Inactive:
FMI 12 & 13: This fault is set inactive when the engine configurations are correctly matched to transmission configurations.

Possible Causes:
FMI 13
• TECU
– Incorrect Transmission Model configuration