jcb JS300 Service Manual page 388

Effect
The unit cannot cool the cab The
compressor disengages.
Effect
The fan speed stays at maximum in
AUTO mode. The manual mode
blower operates as normal.
Table 12. Error Code E19 - No Communications Between User Interface / Control Panel and ATC Control Module.
Effect
The unit cannot cool the cab / The
compressor disengages.The ATC /
Heater control does not operate.The
fan speed stays at maximum in Auto
mode / The fan speed operates as
normal in Manual mode.
Effect
The unit cannot cool the cab / The
compressor disengages.Fan speed
unable to adjust in both auto and
manual modes (fan speed defaults to
max or min.) Temperature will be on
maximum hot or maximum cold and
unable to change.
B-19
Table 10. Error Code 8 - Evaporator Temperature Sensor Error
Causes
There is no temperature signal from
the sensor to ATC control module.
There is a bad earth on the evaporator
temperature sensor.
There is a defective sensor.
Table 11. Error Code 9 - Outlet Temperature Sensor Error
Causes
There is no temperature signal from
the sensor to ATC control module.
There is a bad earth on The outlet
temperature sensor.
There is a defective sensor
Causes
Wiring Error
Connector Error
Defective user interface / Control panel
or ATC control unit
Table 13. PWM Failure (No Fault Code Displayed)
Causes
Wiring Error
Section B - Body and Framework
Heater/Air Conditioning SYSTEM
9813/5100-1
Fault Finding
Remedy
Check the continuity between pin1 on
the evaporator temperature sensor to
pin 23 on ATC control module.
Check for good earth as shown on
schematic.
Make sure the sensor connections are
correct. Replace the evaporator
temperature sensor.
Remedy
Check the continuity between pin1 on
the outlet temperature sensor to pin 22
on ATC control module.
Check for good earth as shown on
schematic.
Make sure the sensor connections are
correct. Replace the outlet
temperature sensor.
Remedy
Check power at pins on User Interface
and ATC control module.
Check Earth at pins on User Interface
and ATC control module.
Check the Continuity between the
wires that connect the User Interface
and the ATC control module.
Check the connector plugs between
User Interface and ATC control module
are in good condition.
Replace the defective unit
Remedy
Check power and earths on PWM as
shown on schematic.
Expected readings for inputs to WM
during normal operation.Pin 5 and Pin
6 Minimum 0.016 volts to maximum
11.18 volts
B-19