TM 10-3930-675-24-1
TRANSMISSION SPEED SENSORS TROUBLESHOOTING - CONTINUED
0027 00
Table 2. Error Code 650 - Engine Speed Sensor Failure,
Short Circuit to Chassis Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 650 - Engine Speed Sensor Failure, 1. Check connector and pins.
If resistance is not as specified or
Short Circuit to Chassis.
Disconnect connector X173
continuity to ground is present,
located in the middle panel
move the cab to the transport
behind the operator's seat.
position (TM 10-39030-675-10)
Check resistance at the loose
and remove the transmission
part of connector X173
front access cover (WP 0142 00).
between pins 4 and 5 and check
pin for continuity to ground
resistance should be 950 to
1,150 Ohms with no continuity
to ground.
2. Check resistance. Disconnect
If resistance is not as specified,
and inspect the 761 engine
continuity to ground is present, or
speed sensor located on the left
the 761 engine speed sensor is
side of the transmission. Check
damaged, replace the 761 engine
resistance of the 761 engine
speed sensor (WP 0094 00).
speed 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 761 connector and
If continuity is not present in
pins for damaged and proper
either wire, continuity to ground
connection. Check continuity
is present, or connector 761 is
to ground of wires 1734 and
damaged, notify Sustainment
1735 (WP 0048 00-14).
Maintenance to replace engine
and transmission wiring harness.
4. Check connector and pins. a. Repair or replace damaged
Disconnect ECU (793). Check
connector (WP 0113 00).
the connector and ECU pins 3 b. Replace damaged ECU (793)
and 19 for damage. Check
(WP 0080 00).
continuity and continuity to c. Replace open or grounded
ground of wires A1734 and
wire.
A1735A (WP 0048 00-14).
0027 00-3
