TH31-C9I, TH31-C9P, TH31-C9T, TH35-C11I, TH35-C13I, TH35-C13T, TH35-C15I and TH35-C15T Petroleum Power Train Packages and TH31-E61 and TH35-E81 Petroleum Transmissions Power Train Electronic Control System Caterpillar

Use the instrument cluster or use the Caterpillar Electronic Technician 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 to the diagnostic trouble code (CID and FMI). The following table is a list of possible diagnostic trouble codes for the ECU.

TH31 and TH35 Transmission

Table 1

Diagnostic Trouble Codes For The TH31 and TH35 Transmission (1)
For troubleshooting, see the procedure with the same CID and FMI.
CID / FMI	Description
CID 0041 8 Volt DC Supply:
FMI 03	Voltage above normal or shorted high..
FMI 04	Voltage below normal or shorted low.
CID 0144 Backup Alarm Relay:
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal or open circuit.
FMI 06	Current above normal or grounded circuit.
CID 0168 Electrical System Voltage:
FMI 01	Data valid but below normal operational range.
CID 0177 Transmission Oil Temperature Sensor:
FMI 03	Voltage above normal or shorted high.
FMI 04	Voltage below normal or shorted low.
CID 0190 Speed Sensor (Engine):
FMI 02	Data erratic, intermittent, or incorrect.
FMI 08	Abnormal frequency, pulse width, or period.
CID 0247 J1939 Data Link:
FMI 09	Abnormal update.
CID 0248 Cat Data Link:
FMI 09	Abnormal update.
CID 0444 Starter Motor Relay:
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal or open circuit.
FMI 06	Current above normal or grounded circuit.
CID 0585 Transmission Output Speed Sensor 1:
FMI 02	Data erratic, intermittent, or incorrect.
FMI 08	Abnormal frequency, pulse width, or period.
CID 0672 Torque Converter Output Speed Sensor:
FMI 02	Data erratic, intermittent, or incorrect.
FMI 08	Abnormal frequency, pulse width, or period.
CID 0673 Transmission Output Speed Sensor 2:
FMI 02	Data erratic, intermittent, or incorrect.
FMI 08	Abnormal frequency, pulse width, or period.
CID 0702 Transmission Gear Lever Selector Sensor (Switch):
FMI 05	Current below normal.
FMI 06	Current above normal.
FMI 08	Abnormal frequency, pulse width, or period.
CID 0709 Transmission Lockup Clutch Solenoid:
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal.
FMI 06	Current above normal.
FMI 11	Failure mode not identifiable.
CID 0826 Torque Converter Oil Temperature Sensor:
FMI 03	Voltage above normal or shorted high.
FMI 04	Voltage below normal or shorted low.
CID 1326 ECM Location Code:
FMI 02	Data erratic, intermittent, or incorrect.
CID 1401 Transmission Solenoid 1:
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal or shorted low.
FMI 06	Current above normal or open circuit.
FMI 11	Failure mode not identifiable.
CID 1402 Transmission Solenoid 2:
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal or shorted low.
FMI 06	Current above normal or open circuit.
FMI 11	Failure mode not identifiable.
CID 1403 Transmission Solenoid 3:
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal or shorted low.
FMI 06	Current above normal or open circuit.
FMI 11	Failure mode not identifiable.
CID 1404 Transmission Solenoid 4:
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal or shorted low.
FMI 06	Current above normal or open circuit.
FMI 11	Failure mode not identifiable.
CID 1405 Transmission Solenoid 5:
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal or shorted low.
FMI 06	Current above normal or open circuit.
FMI 11	Failure mode not identifiable.
CID 1406 Transmission Solenoid 6 (For TH35 Only):
FMI 03	Voltage above normal or shorted high.
FMI 05	Current below normal or shorted low.
FMI 06	Current above normal or open circuit.
FMI 11	Failure mode not identifiable.
CID 1823 Shift Rail #1 Position Sensor
FMI 03	Voltage above normal
FMI 04	Voltage below normal
CID 1824 Shift Rail #2 Position Sensor
FMI 03	Voltage above normal
FMI 04	Voltage below normal
CID 1825 Shift Rail #3 Position Sensor
FMI 03	Voltage above normal
FMI 04	Voltage below normal
CID 2859 Transmission Dropbox Disconnect #1 Engage
FMI 03	Voltage above normal
FMI 05	Current below normal or open circuit
FMI 06	Current above normal or grounded circuit
CID 2860 Transmission Dropbox Disconnect #2 Engage
FMI 03	Voltage above normal
FMI 05	Current below normal or open circuit
FMI 06	Current above normal or grounded circuit
CID 2861 Transmission Dropbox Disconnect #3 Engage
FMI 03	Voltage above normal
FMI 05	Current below normal or open circuit
FMI 06	Current above normal or grounded circuit
CID 2862 Transmission Dropbox Disconnect #1 Disengage
FMI 03	Voltage above normal
FMI 05	Current below normal or open circuit
FMI 06	Current above normal or grounded circuit
CID 2863 Transmission Dropbox Disconnect #2 Disengage
FMI 03	Voltage above normal
FMI 05	Current below normal or open circuit
FMI 06	Current above normal or grounded circuit
CID 2864 Transmission Dropbox Disconnect #3 Disengage
FMI 03	Voltage above normal
FMI 05	Current below normal or open circuit
FMI 06	Current above normal or grounded circuit

( 1 )

For the Transmission ECU, the MID is 027. This table pertains to diagnostic trouble codes with a MID of 027.