TM 10-3930-675-24-1
TRANSMISSION TEMPERATURE TROUBLESHOOTING
THIS WORK PACKAGE COVERS
Error Code 637 - Transmission Sump Temperature Sen-
Error Code 640 - Converter Output Temperature Sensor
sor Failure, Open Circuit or Short Circuit to Battery
Failure, Short Circuit to Chassis
Error Code 638 - Transmission Sump Temperature Sen-
Error Code 783 - Sump Temperature Critical Threshold
sor Failure, Short Circuit to Chassis
[212F (100C)] Failure
Error Code 639 - Converter Output Temperature Sensor
Error Code 795 - Converter Output Temperature Critical
Failure, Open Circuit or Short Circuit to Battery
Threshold [248F (120C)] Failure
INITIAL SETUP
Equipment Condition
References
Cab moved to transport position (TM 10-3930-675-
TM 10-3930-675-10
10)
ECU Transmission (A34650.0200) (WP 0048 00-
12)
NOTE
Refer to WP 0004 00 for additional troubleshooting guidance, information, and illustrations that
locate critical components.
Refer also to illustration at end of work package for component location.
Table 1. Error Code 637 - Transmission Sump Temperature Sensor Failure,
Open Circuit or Short Circuit to Battery Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 637 - Transmission Sump 1.
Check resistance. Disconnect
If resistance is not as specified,
Temperature Sensor Failure, Open Circuit or
connector X172 located in the
move the cab to the transport
Short Circuit to Battery.
middle panel behind the
position (TM 10-3930-675-10)
operator's
seat.
Check
and remove the transmission
front access cover (WP 0142 00).
connector X172 between pins
resistance should be 800 to
1,500 Ohms.
2. Inspect connector. Disconnect
If resistance is not as specified, or
and inspect connector 827
the 827 connector is damaged,
located on the top of the
replace the transmission (WP
transmission. Check resistance
0224 00).
at the mounted part of
connector 827 between pins 8
resistance should be 800 to
1,500 Ohms.