New Holland Workmaster 50, Service Manual

Page: 893 / 1067

Electrical systems - FAULT CODES
DTC 2B4-02-CAN communication failure between vehicle controller
and ECU - BC2ECU2 message
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 is capable of connecting to and communicating on two separate Controller
Area Networks (CAN). Proper configuration and monitoring of the two twisted pair configured networks is also a func-
tion of the ECU A-9000. CAN Node A Bus is the main vehicle interface bus. The ECU A-9000 provides a CAN
termination resistor for the CAN Node A Bus, internal to the ECU A-9000. If the ECU A-9000 senses that CAN Node
A Bus is not functioning properly, this fault will occur.
Cause:
ECU A-9000 has sensed a timeout of required vehicle controller data provided on CAN Node A.
Possible failure modes:
1. Faulty supply voltage or ground, missing.
2. Faulty CAN circuit wiring, open circuit, short to ground, or short circuit.
3. Faulty ECU A-9000, termination resistor or software.
Solution:
1. Verify fault is present and in active state.
Use the Electronic Service Tool (EST) to check the status of this fault.
A. If the fault is present and active, continue with Step 2 .
B. If the fault is no longer present or is in an inactive state, the fault may be intermittent and not currently active.
Continue with Step 5 .
2. Check for other vehicle CAN faults.
Use the EST to determine if vehicle CAN faults exist.
A. If other vehicle CAN faults do exist, resolve those vehicle CAN faults first, then check to see that this fault is
also resolved.
B. If other vehicle CAN faults do not exist, continue with Step 3 .
3. Check the ECU A-9000 supply voltage.
Disconnect the vehicle (VE) harness from the ECU A-9000 at connector X-9102 .
To energize the Main relay K-9102, place a jumper wire between the vehicle harness (VE) side of connector X-9102
pin K28 and chassis ground.
Use a multimeter to check for voltage on the vehicle (VE) harness side:
From To Value
X-9102 pin K01 X-9102 pin K02 There should be approximately
12.0 V .
X-9102 pin K03 X-9102 pin K04 There should be approximately
12.0 V .
X-9102 pin K05 X-9102 pin K06 There should be approximately
12.0 V .
A. If the voltage is present on all of the checks, leave connector X-9102 disconnected and continue with Step 4 .
47866583_ 02/12/2015
55.12 [55.DTC] / 172