New Holland CX720 Repair Manual page 3503

E0665-07-CSW Thresher Speed Decr. Mechanical Out of Range
(K.40.B.05.81 - G.30.C.24)
E0665-07 - CSW Thresher Speed Decr. Mechanical Out of Range
Cause:
The Right Hand Module (RHM) has detected that the Console Switch (CSW) Drum Speed Decrease circuit voltage
is >3.500 volts since power up.
Possible failure modes:
1. The CSW Drum Speed Decrease circuit is shorted to >3.500 volts .
2. RHM internal failure.
3. The Drum Speed switch S-17(DE) is stuck or shorted to >3.500 volts .
Solution:
1. Verify the fault is present. Enter the Infoview monitor - "Diagnose info" screen, "Console" sub menu. Select
"CSW Thresher Speed Decr." and observe the voltage.
The normal operating range for the CSW Thresher Speed Decrease circuit is 0.5 - 12.0 volts .
Note that the Infoview monitor is limited to 0.0 - 5.0 volts .
A. If the voltage reading is >3.500 volts , continue with Step 2.
B. If the voltage reading is within the proper limits, the fault may be intermittent. Continue troubleshooting at
Step 5.
2. Verify the RHM is good. Turn off the ignition switch. Disconnect the Right Console Harness connector X030
. Using the proper tool, remove pin 4 wire 348 yellow from X030 . With the wire removed from the connector,
reconnect X030 . Turn the ignition back on and recheck the CSW Drum Speed Decr. voltage.
A. If the voltage now reads <3.500 volts , the RHM is good. Continue troubleshooting at Step 3.
B. If the voltage is still >3.500 volts , then the fault is in the RHM. Reinstall the wire removed for troubleshoot-
ing. Reload the system software to see if the fault code clears. If the fault is still present after reloading
the software, replace the RHM. Continue troubleshooting at Step 5.
3. Verify the Drum Speed switch S-17(DE) is good. Using a voltmeter, measure the voltage at Drum Speed switch
S-17 connector X046 pin 16. While observing the voltage reading, operate the Drum Speed Decrease Switch
S-17(DE).
A. If the voltage reading varies from <3.500 - 12.0 volts, then the switch is working properly. Continue trou-
bleshooting at Step 4.
B. If the voltage never reads <3.500 volts , turn off the ignition switch. Disconnect the Drum Speed switch
S-17 connector X046 . Using the proper tool, remove pin 1 wire 348 yellow from X046 . With the wire
removed from the connector, reconnect X046 . Turn the ignition back on and recheck the voltage reading.
If the voltage reading still does not drop to <3.500 volts , reinstall the wire removed for troubleshooting.
Replace Front Switch Panel A-13. Continue troubleshooting at Step 5.
4. Verify circuit 348 yellow is good. Inspect for a short to another wire between RHM connector X030 pin 4 and
Drum Speed switch S-17 connector X046 pin 1.
A. If the circuit checks good, continue troubleshooting at Step 5.
B. Locate the short. Repair the shorted wiring. Continue troubleshooting at Step 5.
5. Visually inspect the harness and connectors for damage, bent or dislocated pins, broken or pinched wires.
A. Repair any damage found during visual inspection.
B. If no damage is found, erase the fault code and continue operation.
Series 1348 and above
CROP PROCESSING - THRESHING Conventional threshing
2 4/7/2006
K.40.B / 65