CX210/CX240 ELECTRONIC FUEL SYSTEM
8 - 23
CX EXCAVATORS
FAULT CODE LISTING
Fault Associated Hardware Reason Effect
(only with active code)
F386 Engine sensor voltage
high.
High voltage at engine
position sensor 5VDC at
pin 10 of the engine
harness.
Default value used.
Engine will de-rate to no
boost fueling with loss of
engine protection.
F391 Fuel pump power shut off
relay.
Error detected at VP44
power relay enable circuit
at pin 43 of engine
harness.
Possible no effect on
engine or engine may not
run.
F415 Oil pressure sensor/ EPF Signal indicates pressure is
below the very low engine
protection limit.
Speed de-rate and
possible engine shut
down.
F418 Water in Fuel sensor. Signal indicates the water
in the fuel filter should be
drained.
Water in fuel can lead to
severe fuel system
damage.
F422 Coolant level sensor Voltage at both high and
low level signal pins 27 and
37 of the engine harness or
no voltage at both .
No engine protection for
coolant level.
F429 Water in Fuel sensor. Low voltage at WIF signal
pin 40 of the OEM harness.
No water in fuel
protection.
F431 Accelerator pedal
position sensor low.
Idle validation signals on
pins 25 and 26 of the OEM
harness indicates voltage
detected simultaneously on
both pins (open circuit)
No effect on engine
performance but loss of
idle verification.
F433 Boost pressure sensor
high.
Signal indicates pressure is
high when engine
conditions indicate signal
should be low.
Possible over fueling
during acceleration with
increased black smoke.
F434 Electronic Control Module Supply voltage to the ECM
fell below 6 VDC for a
fraction of a second or
ECM was not allowed to
power down correctly.
Possible no performance
effect or engine stopping
or hard starting.
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