New Holland CX720 Repair Manual page 3966

40. Disconnect connector X219. Use a multimeter to check for continuity between connector X219 pin 3 and chassis
ground.
A. If continuity is found, the open circuit is in the expansion (EX) harness between connector X025 pin 17
and connector X219 pin 3 wire 792 white. Locate the open and repair.
B. If no continuity is found, continue with step 41.
41. Remove the upper/lower sieve relay K18 from the fuse panel. Use a multimeter to check for continuity between
Upper/lower sieve relay K18 terminal 4 and chassis ground.
A. If no continuity is found, the open circuit is in the cab main (CM) or main frame (MF) harness wire 792
white from the fuse panel through connector X005 pin 17 to connector X219 pin 3 . Locate the open and
repair.
B. If continuity is found, continue with step 42.
NOTE: Continuity check is being done back through circuit through the motor. The resistance will read signifi-
cantly higher than previous tests, but should not be higher than 10 ohms above the motor resistance measured
in step 33.
42. Reconnect connector X005. Use a multimeter to check for continuity between Upper/lower sieve relay K18
terminal 3 and chassis ground.
A. If continuity is found, the relay has failed open between terminals 3 and 4. Replace the relay.
B. If no continuity is found, continue with step 43.
43. Disconnect connector X005. Use a multimeter to check for continuity between connector X005 pin 15 and
chassis ground.
A. If continuity is found, the open circuit is in the cab main (CM) harness between the Upper/lower sieve relay
K18 terminal 3 on the fuse panel and connector X005 pin 15 wire 786 red. Locate the open and repair.
B. If no continuity is found, continue with step 44.
44. Disconnect connector X219. Use a multimeter to check for continuity between connector X219 pin 1 and chassis
ground.
A. If continuity is found, the open circuit is in the main frame (MF) harness between connector X219 pin 1
and connector X005 pin 15 wire 786 red. Locate the open and repair.
B. If no continuity is found, , the open circuit is in the expansion (EX) harness between connector X219 pin
1 and connector X013 pin J2-21 wire 786 red. Locate the open and repair.
45. Fault codes and operating condition indicate that the motor has shorted to ground. Disconnect upper sieve
motor connector X227. Measure between terminals D or E on the motor connector and a known good ground.
There should be no continuity to ground.
A. There is continuity to ground, indicating a short to ground in the motor. Replace the upper sieve motor.
B. There is no continuity to ground. Erase the fault codes and continue operation.
46. Fault codes and operating condition indicates that there is an open circuit on shared wiring between the upper
sieve motor and lower sieve motor circuits. Replace the Upper/lower sieve relay K18 on the fuse panel with a
known good relay, and retest the upper and lower sieve circuit function.
A. If both circuits now function properly, the relay was faulty, and was not providing continuity between the
work terminal 3 and terminals 4 & 5. Replace the relay.
B. If both circuits still do not work, continue with step 47.
47. Ensure that the batteries are connected using the battery key, and that fuse F23 is good. Remove the Upper/
lower sieve relay K18 on the fuse panel. Use a multimeter to check for continuity between Upper/lower sieve
relay K18 terminal 3 and chassis ground.
A. If no continuity is found, continue with step 48.
CROP PROCESSING - CLEANING Primary cleaning
K.62.B / 254
2 4/7/2006