New Holland CX720 Repair Manual page 3614

E0144-03-Straw Walker RPM sensor Shorted To High Source
(K.42.E.95.50 - G.30.B.54)
E0144-03 - Straw Walker RPM sensor Shorted To High Source
Cause:
The straw walker RPM sensor (B-13) circuit is shorted to a higher than normal voltage source.
Possible failure modes:
1. Sensor supply wiring shorted to 12 volts.
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 for sensor when blocked by ferrous metal - 5.6 - 7.3 volts
The proper voltage for sensor when not blocked 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 out of range 9.0 - 10.0 volts, continue with Step 2.
B. If the voltage reading is within the proper limits, since the shorted wire may not be powered up at this time.
Continue the troubleshooting at step 3.
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 high. Disconnect the straw walker RPM sensor connector X185.
A. If the voltage drops to 7.3 - 9.0 volts, the short is in the sensor or sensor wiring. Replace the sensor.
B. If the voltage remains high on InfoView monitor, the short circuit is in the main frame harness between
connector X185 pin 2 and connector X016 pin J2-28 wire 414 yellow. Locate short and repair.
3. 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.
CROP PROCESSING - SEPARATING Straw walker
2 4/7/2006
K.42.E / 24