New Holland CX720 Repair Manual page 3882

E0262-03-Upper Sieve Decrease - Rear Switch Shorted To High
Source (K.62.B.05.56 - G.30.B.54)
E0262-03 - Upper Sieve Decrease - Rear Switch Shorted To High Source
Cause:
The upper sieve rear adjust switch (S-35) 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 the "CCM3" sort menu, and select "Upper Sieve Decr
- rear" to check the voltage range.
The normal operating range for the upper sieve rear adjust circuit is 1.8 - 10.0 volts when the switch is not
depressed.
The normal operating range for the upper sieve rear adjust circuit is 0 - 1.8 volts when the switch is depressed.
A. If the voltage reading is 10.0 volts or greater, continue with Step 2.
B. If the voltage reading is within the proper limits, the shorted wire may not be powered up at this time.
Continue the troubleshooting at Step 4.
2. Disconnect the upper sieve rear adjust switch connector X225 .
A. If the voltage drops below 10.0 volts , the short is in the sensor, or sensor wiring. Replace the sensor.
B. If the voltage is above 10.0 volts , continue with Step 3.
3. Disconnect the straw hood front (SW) harness from the expansion (EX) harness at connector X025 .
A. If the voltage drops back within range, the short is in the straw hood front (SW) harness between connector
X025 and connector X225 wire 539 yellow. Locate the short and repair.
B. If the voltage remains above 10.0 volts , the short is in the main frame (MF) harness between connector
X025 and connector X013 pin J2-34 wire 539 yellow. Locate the short and repair.
4. Visually inspect the harness and connectors for damage, bent or dislocated pins, corroded terminals or broken
wires.
A. Repair any damage found during visual inspection.
B. If no damage is found, erase the fault code and continue operation.
Series 1206-1347
Wiring harness - Electrical schematic frame 16 (A.30.A.88-C.20.E.16)
Series 1348 and above
Wiring harness - Electrical schematic frame 21 (A.30.A.88-C.20.E.21)
CROP PROCESSING - CLEANING Primary cleaning
K.62.B / 170
2 4/7/2006