TM 10-3930-675-20-1
0027 00-8
TRANSMISSION SPEED SENSORS TROUBLESHOOTING - CONTINUED
0027 00
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,
Short Circuit to Chassis
1. Remove cab transmission and
steering ECU panel cover and
check
transmission
ECU
connector
for
proper
connection (WP 0079 00).
Connect loose or disconnected
connector.
2. Remove cab rear wall center
panel
cover
and
check
connector X173 for proper
connections.
Connect loose or disconnected
connectors.
3. Move operator’s cab to
transport position and remove
transmission access covers
(WP 0135 00).
4. Check transmission electrical
harness connector 752 for
proper connection at internal
speed sensor.
Connect loose or disconnected
connectors.
5. Disconnect connector 752,
connector
X173,
and
connector on transmission
ECU.
6. Check for continuity to
chassis at connector 752 pin
1, connector X173 pin 8,
connector 752 pin 2, and
connector X173 pin 9.
a. If continuity is present, repair
or replace connectors (WP
0111 00).
b. If wiring harness must be
replaced, notify SRA.
7. Perform internal resistance
check on internal speed
sensor. Resistance should be
1050 +/- 100 ohms.
If resistance is not as specified,
replace internal speed sensor
(WP 0095 00).
8. Perform continuity check
between internal speed sensor
pin 1 and pin 2 and chassis.
If continuity is present, replace
internal speed sensor (WP 0095
00).
