New Holland CX720 Repair Manual page 3881

E0261-04-Lower Sieve Decrease - Rear Switch Shorted to Low
Source (K.62.B.05.61 - G.30.B.53)
E0261-04 - Lower Sieve Decrease - Rear Switch Shorted to Low Source
Cause:
The lower sieve rear adjust switch (S-46) circuit is shorted to ground since power up.
Possible failure modes:
1. Switch wiring shorted to ground.
2. Switch failure (stuck closed).
3. Controller internal failure (internal regulator failure).
Solution:
1. Enter the InfoView™ monitor "Diagnose info" screen. Select the "CCM3" sort menu, and select "Lower Sieve
Decrease- rear" to observe the voltage.
The normal operating range for the lower sieve rear adjust circuit is 1.8 - 10.0 volts when the switch is not
depressed.
The normal operating range for the lower sieve rear adjust circuit is 0 - 1.8 volts when the switch is depressed.
A. If the voltage reading is <0.5 volts or less, continue with Step 2.
B. If the voltage reading is within the proper limits, the wire may not be shorted at this time. Continue trou-
bleshooting at Step 4.
2. Disconnect the lower sieve rear adjust switch straw walker (SW) harness connector X226 . Observe the In-
foView™ monitor "Lower Sieve Decrease- rear" voltage.
A. If the voltage returns to 1.8 - 10.0 volts , the short is in the switch. Replace lower sieve rear adjust switch
S-46. Continue troubleshooting at Step 4.
B. If the voltage remains at <0.5 volts , continue with Step 3.
3. Disconnect the straw walker (SW) harness from the expansion (EX) harness at connector X025 .
A. If the voltage returns to 1.8 - 10.0 volts , the short is in the straw walker (SW) harness between connector
X025 and connector X226 wire 541 yellow. Locate the short and repair. Continue troubleshooting at Step
4.
B. If the voltage remains at <0.5 volts , the short is in the expansion (EX) harness between connector X025
and connector X013 pin J2-39 wire 541 yellow. Locate the short and repair. If no short can be found,
replace CCM-3. Continue troubleshooting at Step 4.
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 / 169
2 4/7/2006