jcb JS 200 Series, Service Manual

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Diagnostics for CAPS II Controllers
The diagnostic capabilities of the present CAPS II system
have been improved to include facilities for storing
information on intermittent faults occurring in the electrical
system and machine performance data .
The original diagnostic capabilities included facilities to
check the following:
CH : MN Machine Model Code
CH : RPM Engine R.P.M
CH : PWM Milliamps Supplied To Hydraulic Pump
CH : PLS Throttle System Pulse Count
CH : OS Hydraulic Oil Temperature
CH : WS Water Temperature
CH : FS Resistance Of Fuel Level Sensor
CH : TV Throttle System Voltage
CH : TR Transistor Output Check †
CH : PS Pressure Switch Output Check
† The controller can check the outputs to the main relays /
solenoids and test for short circuit.
This system was limited by the fact that all checks are
instantaneous and no facility existed for storing information
on intermittent faults. If the ignition was switched off the
controller would reset itself and the fault if intermittent would
no longer be present, this can make fault diagnosis very
difficult.
Improvements to Diagnostic System
The stage II system retains all of the previous functions of
the original system with the addition of two DATA LOGGING
channels with the denominations channel 3 and channel 4.
Channel 3: Monitors and stores information on the
electrical system.
Channel 4: Monitors and stores information on machine
performance.
This system is accessed using the same setup buttons used
on the previous system to reprogram the controller and as
before, the items to be checked appear in the monitors
displays.
Section C Electrics
9803/6400
Section C
10 - 1
Issue 1
CAPs II Diagnostic system
MODE
P
A296560
MODE WINDOW
CLOCK SCREEN
MONITOR WINDOW