TM 10-3930-675-20-1
0027 00-3
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,
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
connection block X173 for
proper connections.
Connect loose or disconnected
connectors.
3. Move
operators
cab
to
transport position and remove
transmission access covers
(WP 0135 00).
4. Check transmission electrical
harness connector 761 at
engine speed sensor for proper
connection.
Connect loose or disconnected
connectors.
5. Disconnect connector 761,
connector X173, and trans-
mission ECU connector.
6. Check continuity to chassis at
between connector 761 pin 1,
connector
X173
pin
4,
connector 761 pin 2, and
connector X173 pin 5.
a. If continuity is present, repair
or replace connectors (WP
0111 00).
b. If wiring harness must be
replaced, notify SRA.
7. Disconnect
engine
speed
sensor connector 761.
8. Perform an internal resistance
check of engine speed sensor.
Resistance should be 1050 +/-
100 ohms.
If resistance is not as specified,
replace engine speed sensor (WP
0095 00).
9. Perform
continuity
check
between engine speed sensor
pin 1 and pin 2 and chassis.
If continuity is present, replace
engine speed sensor (WP 0095
00).