TM 10-3930-675-24-1
TRANSMISSION SPEED SENSORS TROUBLESHOOTING - CONTINUED
0027 00
Table 7. Error Code 655 - Internal Speed Sensor Failure, Open
Circuit or Short Circuit to Battery Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 655 - Internal Speed Sensor Failure,
4. Check connector and pins. a. Repair or replace damaged
Open Circuit or Short Circuit to Battery -
Disconnect ECU (793). Check
connector (WP 0113 00).
Continued.
the connector and ECU pins 3 b. Replace damaged ECU (793)
and 42 for damage. Check
(WP 0080 00).
continuity of wires A1738, c. Replace open or shorted wire.
A1735A,
A1735B,
and
A1735C (WP 0048 00-14).
Table 8. Error Code 656 - Internal Speed Sensor Failure, Short
Circuit to Chassis Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 656 - Internal Speed Sensor Failure, 1. Disconnect connector X173
If resistance is not as specified or
Short Circuit to Chassis.
located in the middle panel
continuity to ground is present,
behind the operator's seat.
move the cab to the transport
Check resistance at the loose
position (TM 10-3930-675-10)
part of connector X173
and remove the transmission
between pins 8 and 9 and check
front access cover (WP 0142 00).
pin for continuity to ground
should be 950 to 1,150 Ohms
with no continuity to ground.
2. Check sensor and pins.
If resistance is not as specified,
Disconnect and inspect the 752
continuity to ground is present, or
internal gear speed sensor
the 752 internal gear speed sensor
located on the left side of the
is damaged, replace the 752
transmission. Check resistance
internal gear speed sensor (WP
of the 752 internal gear speed
0096 00).
sensor between the two pins
and check pin for continuity to
ground (WP 0048 00-14).
Resistance should be 950 to
1,150 Ohms with no continuity
to ground.
3. Inspect the 752 connector and
If continuity is not present in
pins for damage and proper
either wire, continuity to ground
connection. Check continuity
is present, or connector 752 is
and for continuity to ground of
damaged, notify Sustainment
wires 1738 and 1739 (WP
Maintenance to replace engine
0048 00-14).
and transmission wiring harness.
0027 00-8
