HUB-RING GEAR 8G1479 - Caterpillar

Use the instrument cluster or use the Caterpillar Electronic Technician (Cat ET) in order to determine the diagnostic trouble codes for the Transmission ECU. After determining the diagnostic trouble codes, refer to the corresponding test procedure for more information. Perform the procedure that corresponds with the correct diagnostic trouble code. The following table is a list of possible diagnostic trouble codes for the ECU.Portions of this material are reprinted with permission from SAE J1939DA_201607© 2016 SAE International. SAE International is not responsible for any use or translation of this material, in whole or in part. Please contact SAE International to obtain a complete copy of SAE J1939DA_201607, the official definitive source of this standard.
Table 1
Diagnostic Trouble Codes For The CX31 Series Transmissions
For troubleshooting, see the procedure with the same "SPN" and "FMI".
"SPN"/"CID" Description
SPN 91 Accelerator Pedal
FMI 9 Abnormal update
FMI 19 Data error
SPN 126 Transmission Oil Filter Differential Pressure Sensor
FMI 3 Voltage above normal
FMI 16 Data valid but above normal operating range (moderate severity)
SPN 158 Battery Potential (Keyswitch)
FMI 2 Data that is erratic, intermittent, or incorrect
SPN 161 Transmission Input Shaft Speed
FMI 8 Abnormal frequency
SPN 168 Electrical System Voltage
FMI 3 Voltage above normal
FMI 4 Voltage below normal
SPN 177 Temperature Sensor (Transmission Oil)
FMI 3 Voltage above normal
FMI 4 Voltage below normal
FMI 16 Data valid but above normal operation range (moderate severity)
SPN 190 Speed Sensor (Engine)
FMI 8 Abnormal frequency
SPN 191 Transmission Output Speed Sensor
FMI 8 Abnormal frequency
FMI 14 Special Instruction
SPN 513 Engine Torque
FMI 9 Abnormal update
FMI 19 Data error
SPN 525 Transmission Gear Request
FMI 9 Abnormal update
SPN 639 J1939 Data Link
FMI 9 Abnormal update
FMI 14 Special Instruction
SPN 734 Transmission Clutch Solenoid 1
FMI 3 Voltage above normal
FMI 5 Current below normal or open circuit
FMI 6 Current above normal or closed circuit
SPN 735 Transmission Clutch Solenoid 2
FMI 3 Voltage above normal
FMI 5 Current below normal or open circuit
FMI 6 Current above normal or closed circuit