New Holland CX720 Repair Manual page 3616

E0144-05-Straw Walker RPM sensor Line Disconnected
(K.42.E.95.50 - G.30.B.50)
E0144-05 - Straw Walker RPM sensor Line Disconnected
Cause:
The straw walker RPM sensor (B-13) circuit is open.
Possible failure modes:
1. Sensor supply or ground wiring is open.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter the InfoView monitor - "Diagnose info" screen.
Select "Threshing" sub menu.
Select "Straw Walker RPM sensor" and check voltage range.
The proper voltage sensor blocked by ferrous metal - 5.6 - 7.3 volts
The proper voltage sensor unblocked by ferrous metal - 0.5 - 5.6 volts
The proper voltage sensor disconnected 7.3 - 9.0 volts.
A. If the voltage reading is high 7.3 - 9.0 volts continue with Step 2.
B. If the voltage reading is within the proper limits. Continue the troubleshooting at step 4.
NOTE: Visually inspect the wiring harness and connectors. Verify that the connector was fully installed. Inspect
the terminals and wires at the connector for pushed back or corroded terminals or damaged wires. Flex the
harnesses involved to reveal intermittent breaks or shorts in the wiring concerned.
2. The voltage reading on the InfoView monitor is 7.3 - 9.0 volts. Disconnect the straw walker RPM sensor con-
nector X185. Use a jumper wire to short the harness end of connector X185 pin 2 to chassis ground.
A. If the InfoView monitor drops to 0 - 0.5 volts indicating a ground, the open circuit is not in the supply side
of the circuit. Continue with step 3.
B. If the InfoView monitor still displays 7.3 - 9.0 volts, the open circuit is in the main frame (MF) harness
between connector X185 pin 2 and connector X016 pin J2-28 wire 414 yellow. Locate the open and
repair.
3. The voltage reading on the InfoView monitor is 7.3 - 9.0 volts. Disconnect the straw walker RPM sensor con-
nector X185. Use a multimeter to check for continuity between connector X185 pin 1 and chassis ground.
A. If there is continuity to ground, the sensor has failed. Replace the sensor.
B. If there is no continuity, the open circuit is in the main frame (MF) harness between connector X185 pin 1
and connector X016 pin J2-14 wire 493 blue or 465 blue. Locate the open and repair.
4. Turn the key to ON position. Observing the LED on the harness end side of the sensor, place ferrous metal in
front of sensor then remove. The sensor is functioning if LED changes state.
A.
Series 1206-1281
Wiring harness - Electrical schematic frame 06 (A.30.A.88-C.20.E.06)
Series 1282-1347
Wiring harness - Electrical schematic frame 07 (A.30.A.88-C.20.E.07)
Series 1348 and above
Wiring harness - Electrical schematic frame 20 (A.30.A.88-C.20.E.20)
CROP PROCESSING - SEPARATING Straw walker
2 4/7/2006
K.42.E / 26