Can Bus Off State, Data Incorrect - New Holland CX720 Repair Manual

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0484.2-CAN BUS OFF STATE, DATA INCORRECT (SERVICE TOOL
FAULT CODE 178) (B.20.A.92 - G.30.C.10)
CX840
0484.2 - CAN BUS OFF STATE, DATA INCORRECT (SERVICE TOOL FAULT CODE 178)
Context:
Engine enabled - fuel restricted and speed restricted to 1500 rev/min.
Cause:
Faulty connection between engine ECU and Vehicle ECU
Possible failure modes:
1.
Wiring fault between engine ECU and Vehicle ECU
2.
Incorrect vehicle ECU
Solution:
1.
Check the compatibility between the vehicle ECU and engine ECU software
A.
NOTE : If new software has been downloaded into either the vehicle ECU or engine ECU check that the
level is suitable for use with that machine configuration.
2.
Check the CAN BUS wiring between the vehicle ECU and engine ECU
NOTE : The CAN wiring for the Header Height Control ECU is also spliced into the same wires used between
the vehicle ECU and engine ECU. Therefore other fault codes may be exhibited related to the HHC module. If
no other errors are exhibited the fault may be an Open Circuit prior to the splices.
A.
Ensure the key start is OFF. Disconnect the CCM2 connector, X016, Engine ECU connector X192 and
HHC module connector X281. Check for continuity between engine ECU connector X193, pin 11 and
CCM2 connector, X016, pin J2-23 and between engine ECU connector X193, pin 12 and CCM2 connector,
X016, pin J2-32. An open circuit in either wire indicates a fault and requires tracing and repairing.
B.
Ensure the key start is OFF. Disconnect the CCM2 connector, X016, Engine ECU connector X192 and
HHC module connector X281. Check for a short to ground at engine ECU connector X193, pin 11 and
engine ECU connector X193, pin 12. A short circuit to ground in either wire indicates a fault and requires
tracing and repairing.
C.
Disconnect the CCM2 connector, X016, Engine ECU connector X192 and HHC module connector X281.
With the key start ON, check for a short to +12 V at engine ECU connector X193, pin 11 and engine ECU
connector X193, pin 12. A short to +12 V in either wire indicates a fault and requires tracing and repairing.
3.
Check CCM2 controller
A.
Check the hardware of the CCM2 controller. Remove and inspect the connectors, check the installation
of the controller to the vehicle frame, check the ground connections for the controller and check the power
feeds from fuse F-36 and fuse F-37. Repair / replace any damaged items.
B.
Check the software installed in the controller on the InfoView screen. If the InfoView is indicating software
installed and has no CCM2 ECU errors, download the correct level software again into the controller.
Operate the engine, if the error re-occurs substitute the CCM2 controller.
NOTE: If CCM2 ECU errors are indicated rectify these errors first. Refer to the CCM2 fault code charts.
Series 1206-1347
Wiring harness - Electrical schematic frame 25 (A.30.A.88-C.20.E.25)
Series 1348 and above
Wiring harness - Electrical schematic frame 31 (A.30.A.88-C.20.E.31)
POWER PRODUCTION - FUEL AND INJECTION SYSTEM
2 4/7/2006
B.20.A / 270

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