OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Fault Finding
Fault Finding Without Using the JCB Servicemaster Diagnostic Tool
C-160 C-160
9803/9880-3
Fault Finding Without Using the JCB Servicemaster Diagnostic Tool
TC-015
Introduction
The AMS system is designed so that all of the components
that are connected to the system are able to communicate
with each other. This means not only are the machine
hours displayed on the Electronic Monitor (EMS) but also
they are recorded in the Electronic Control Unit 1 (ECU-1).
Changing Machine Components
Under such circumstances where fault diagnosis is not
possible by using the JCB Servicemaster diagnostic tool
then the following actions must be taken in circumstances
where a change of the Electronic Control Unit 1 (ECU-1)
and/or the Electronic Monitor System (EMS) is
unavoidable.
1 If either a new ECU-1 or new EMS. is fitted to either a
new or old machine, the machines working hours will
pass automatically to the new units and upgrade them
when the machines ignition is switched on.
Note: This includes stock machines with over 1 hour
recorded by the AMS system.
2 Only under extreme circumstances should either the
ECU-1 or the EMS be transferred to a machine with
lower working hours than the donor machine. The
effect of this would be to automatically transfer the
higher hours information to the recipient machine.
Note: This process is not reversible.
3 When either an ECU-1. or EMS is changed on a
machine, the machine system must be set up again
using the Set Up Service Tool. Without this action
some options previously active would not function
and the throttle system would not be calibrated.
4 To remove the EMS unit, carefully pull the unit away
from the facia panel. The unit is held in place by a
retaining seal only and is a tight fit, do not attempt to
lever the unit out as this could cause damage to the
the E.MS and the facia panel. Re-assembly is a
reversal of this procedure.
5 To access the ECU-1,remove the seven panel screws
from the panel behind the seat and remove panel.
6 To remove the ECU-1, remove the three Allen screws
which fasten the computers to a frame. To remove the
machine harnesses from the computers, undo the
Allen screw integral to each connector. Re-assembly
is a reversal of this procedure.
Note: On the ECU-1 the identification letters for the
individual harness connectors and the fixed harness
connections on the computer itself, are the cast letters
(A,B,C) on the body of the computer.This is vital when
identifying connectors and pins during fault diagnosis.
7 The Facia Switch Panel (FSP) is not affected by any
changes of other components.
The system comprises of the following main electronic
components:
401741-C1
Fig 68.
69-A Electronic Control Unit -1 (ECU-1)
68-B Electronic Monitoring System (EMS)
68-C Fascia switch panel (FSP).
401740-C
1
C
B