TM 10-3930-675-24-1
TRANSMISSION TEMPERATURE TROUBLESHOOTING - CONTINUED
0026 00
Table 2. Error Code 638 - Transmission Sump Temperature
Sensor Failure, Short Circuit to Chassis Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 638 - Transmission Sump 3. Inspect the 827 connector and
If continuity is not present in
Temperature Sensor Failure, Short Circuit to
pins for damage and proper
either wire, continuity to ground
Chassis - Continued.
connection. Check continuity
is present, or connector 827 is
and for continuity to ground of
damaged, notify Sustainment
Maintenance to replace engine
and transmission wiring harness.
4. Check
for
Disconnect ECU (793). Check
connector (WP 0113 00).
the connector and ECU pins 39 b. Replace damaged ECU (793)
and 46 for damage. Check
(WP 0080 00).
continuity and for continuity to c. Replace open or grounded
ground of wires 1728 and
wire.
Table 3. Error Code 639 - Converter Output Temperature Sensor Failure,
Open Circuit, or Short Circuit to Battery Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 639 - Converter Output Temperature 1.
Check resistance. Disconnect
If resistance is not as specified,
Sensor Failure, Open Circuit or Short Circuit to
connector X172 located in the
move the cab to the transport
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 10k to
200k Ohms.
If resistance is not as specified, or
and
inspect
the
766
the 766 temperature sensor is
temperature sensor located on
damaged, replace the 766
the transmission bell housing.
temperature sensor (WP 0096
Check resistance of the 766
00).
temperature sensor between
The resistance should be 10k to
200k Ohms.
3. Inspect the 766 connector and
If continuity is not present in
pins for damage and proper
either wire or connector 766 is
connection. Check continuity
damaged, notify Sustainment
of wires 17212 and 17213 (WP
Maintenance to replace engine
and transmission wiring harness.
0026 00-3