jcb JS300 Service Manual page 468

Removal and Replacement Guide
The MECU is a reliable and robust component. Before
removing and replacing the MECU carry out all the
relevant diagnostic and fault finding procedures. Most
faults are usually due to damaged wires, connectors or
connected devices such as sensors or solenoids.
Fig 4.
Removal
The MECU is bound on the CANbus system. Do not
remove or disconnect the MECU unless you have access
to the applicable JCB Servicemaster software tools.
1 Park the machine and make it safe. Obey the care
and safety procedures. Refer to Section 2,
Maintenance.
2 Use Servicemaster to view the machine Set-up.
Record the details from the Set-up screen. Refer to
Servicemaster SYSTEM.
3 Carry out the unlock binding procedure. Refer to the
ECU Set-up instructions.
4 Carry out the correct power down sequence.
Set-up ( T C-39)
C-43
1 2
3
4
C128250-C4
K ECU Set-up ( T C-39)
K ECU
9813/5100-1
Section C - Electrics
Machine Electronic Control Unit (MECU)
5 Disconnect the black harness connector 3 (J1) and
the grey harness connector 4 (J2) at the MECU. Do
not touch the connector pins. Put some tape over the
connectors to protect the pins.
6 Remove four screws 2 and their associated washers.
Replacement
Replace the MECU as follows:
1 Connect the harness connectors at the correct
sockets on the MECU.
2 Carry out the correct power up procedure.
Set-up ( T C-39)
3 Use Servicemaster to install the ECU software. Refer
to Servicemaster SYSTEM.
4 Use Servicemaster to enter the applicable machine
set-up options. Refer to Servicemaster SYSTEM.
5 Use Servicemaster to bind the machine ECU's.
K ECU Set-up ( T C-39)
6 Use Servicemaster to update the immobiliser lock
K ECU Set-up ( T C-39)
and unlock codes.
Note: Do not replace the MECU with a unit from another
machine. ECU's may look the same but have different
software installations.
Electronic Controllers
K ECU
C-43