Error At Position 7, Shorted To High Source - New Holland CX720 Repair Manual

0445.3-ERROR AT POSITION 7, SHORTED TO HIGH SOURCE

(SERVICE TOOL FAULT CODE 51) (B.20.A.92 - G.30.B.54)
CX840
0445.3 - ERROR AT POSITION 7, SHORTED TO HIGH SOURCE (SERVICE TOOL FAULT CODE 51)
Context:
Engine enabled - no restriction on fuel or speed
Cause:
Message cannot be transmitted due to high CAN BUS loading
Possible failure modes:
1. Conflict between vehicle ECU and engine ECU software
2. Fault in CAN BUS wiring between vehicle ECU and engine 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 keystart is OFF. Disconnect the CCM2 connector, X016, Engine ECU connector X193 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 keystart is OFF. Disconnect the CCM2 connector, X016, Engine ECU connector X193 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 X193 and HHC module connector X2811.
With the keystart 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.
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 / 181