New Holland CX720 Repair Manual page 1473

B. If an OL (Overload-Open circuit) reading is observed, continue with step 11.
10. Locate and disconnect the splice in cab main harness, CAN HI wire 127YE and wire 143YE, and CAN LO
wire 128GN and 144GN. This splice is between the Diagnostic and Maintenance ( DAM) connector X065 and
MDM/SSM connector 064.
Again check the resistance between pins A and E on connector X064.
A. A 0 ohm reading indicates the short is between connector X064 MDM/SSM and connector X065 DAM
connector. Locate the short and repair as necessary.
B. An OL (Over load-open circuit) reading indicates the short is between the disconnected splice and con-
nector X001. Locate the short and repair as necessary.
11. Check for continuity between connector X064 pin E and DAM connector X065 pin D.
A. If no continuity is found, locate and repair open in cab main harness wire 144GN between connector X064
pin E and connector X065 pin D.
B. If continuity is found, continue with step 12.
12. Check for continuity between DAM connector X065 pin D and connector X001 pin 7.
A. If no continuity is found, locate and repair open in cab main harness wire 128GN between splice and
connector X001 pin 7.
B. If continuity is found, continue with step 13.
13. Check for continuity between connector X064 pin A and DAM connector X065 pin C.
A. If no continuity is found, locate and repair open in cab main harness wire 143YE between connector X064
pin A and connector X065 pin C.
B. If continuity is found, locate and repair open in cab main harness wire 127YE between splice and connector
X001 pin 6.
14. TROUBLESHOOTING LEG 2 (Refer to Wiring harness - Electrical schematic frame 25 (A.30.A.88-
C.20.E.25))
A. A 0 ohm reading indicates a short circuit between CAN HI and CAN LO.
B. An OL (Open Line) indicates a broken wire.
15. Disconnect connector X015, 1, from the side of CCM2. Use a multimeter to check resistance between pin 8 and
pin 9 on connector X001 at the right hand console.
A. If the reading is still 0 ohms, the short is not in the CCM2, CCM3, or main frame (MF) harness on back to
engine and HHC controllers. Continue with step 17.
B. If the reading is still OL (Over load-open circuit), continue with step 16..
16. Install a jumper wire between pins J1-13 and J1-14 on harness end of connector X015. Check resistance be-
tween pin 8 and pin 9 on connector X001 again.
A. If the reading is still OL (Over load-open circuit) the broken wire is not in the CCM2, CCM3, or main frame
(MF) harness on back to engine and HHC controllers. Continue with step 17.
B. If the reading drops to 1 - 2 ohms, the broken wire is somewhere in the disconnected circuit, CCM2,
CCM3, or main frame (MF) harness back to engine and HHC controllers. Continue with step 19.
17. Disconnect connector X018 from side of CCM1. Use a multimeter to check resistance between pin 8 and pin 9
on connector X001.
DISTRIBUTION SYSTEMS - ELECTRONIC SYSTEM
A.50.A / 79
2 4/7/2006