New Holland CX720 Repair Manual page 1469

A. If affected module is initially online, and then goes offline after a short period of time, it is bussing off due
to excessive error messages. The excessive number of error messages could be due to bad electrical
connections to the network, or a problem with the CAN controller in the module. Continue with step 5.
B. If the module is offline immediately after the network is powered up, continue with step 3.
3. A quick way to verify if a module has a power and ground connection is to activate a function within that module
that does not require other CAN message information (function is controlled entirely by affected module). If the
function operates, then the module is powered up, and the alarm is due to a CAN fault. See available functions
by module below. If the module that is offline is not listed below, continue with step 4.
RHM: Depress Multi Function Handle (MFH) button to activate neutral lock solenoid. If solenoid activates, the
RHM module is powered up and functioning.
CCM1: Turn on Road Lights or Work Lights. If lights come on, CCM1 is powered up and functioning.
CCM2: Turn on Beacon Lights (EU, ROW) or depress brake pedal to activate brake lights. If lights come on,
CCM2 is powered up and functioning.
CCM3: Use remote Sieve Adjust switches to activate sieve actuators (if installed). If sieves operate, CCM3 is
powered up and functioning.
SSM: If it has power but no CAN, warning lights will flash in rotating sequence.
MDM: Icons will be grayed out, and Infoview monitor is non-responsive to keypad on RHM.
Note: There are no quick tests available for CCM3 on Yield monitor-only units.
A. If the module function operates, the module is powered up, and the fault is due to a CAN problem. Continue
with step 5.
B. If the module function does not operate, the module may not be powered up. Continue with step 4.
4. Testing indicates that module is not powering up. Refer to Control module - Service limits (A.50.A.91 -
D.20.A.20) for the specific power and ground sources for each module. Use a multimeter to test for continuity
to ground on the ground path, and for 12 V power on the supply wires.
A. If the module power and ground supplies are good, but the module is still offline, continue with step 6.
5. Testing has determined that the module is offline due to a CAN fault, either with the CAN controller inside the
module, or with the physical wiring to the network. Use a multimeter to check for continuity between the two
wires that connect the module to the network. Refer to Control module - Service limits (A.50.A.91 - D.20.A.20)
Note: Several modules are connected to the network through internal solder paths on the circuit boards, and
cannot be tested as described. These modules include the Infoview monitor (MDM), RHM, CCM1, CCM2, and
the Engine Control Unit (ECU). If one of these modules are offline, continue with step 6.
A. If there is continuity between the two network wires, and the resistance measured is 60 ohms, the external
wiring is okay, and the fault is internal to the module. Continue with step 6.
B. If there is continuity between the two network wires, but the resistance is very high (> 70 ohms), there is a
bad connection in the external wiring to the network. Check the harness and connectors for damage and
repair as necessary.
DISTRIBUTION SYSTEMS - ELECTRONIC SYSTEM
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