G420E/G424E
Tier
LP Engine
Advanced Diagnostics
45
Displaying Fault Codes (DFC)
From SECM Memory
To enter code display mode you must turn OFF the
ignition key. Now turn ON the key but do not start the
engine. As soon as you turn the key to the ON
position you must cycle the Acceleration Pedal by
depressing it to the floor and then fully releasing the
pedal (pedal maneuver). You must fully cycle the
Acceleration Pedal three (3) times within five (5)
seconds to enable the display codes feature of the
SECM. Simply turn the key OFF to exit display mode.
The code list will continue to repeat until the key is
turned OFF. An automatic code display feature is
activated if a Acceleration Pedal fault condition exists.
This feature enables the service technician to view
the fault codes by turning the key to the ON position,
if a Acceleration Pedal malfunction is preventing the
retrieval of the stored fault codes from the SECM.
Clearing Fault (DFC) Codes
To clear the stored fault codes from SECM memory
you must complete the reset fault pedal maneuver.
CAUTION
Once the fault list is cleared it cannot be
restored.
First turn OFF the ignition key. Now turn ON the key
but do not start the engine. As soon as you turn the
key to the ON position you must cycle the
Acceleration Pedal by depressing it to the floor and
then fully releasing the pedal (pedal maneuver). You
must fully cycle the Acceleration Pedal ten (10) times
within five (5) seconds to clear the fault code list of
the SECM. Simply turn the key OFF to exit the reset
mode. The code list is now clear and the SECM will
begin storing new fault codes as they occur.
Fault Action Descriptions
Each fault detected by the SECM is stored in memory
(FIFO) and
has a specific action or result that takes
place. Listed below are the descriptions of each fault
action.
Engine Shutdown:
The most severe action is an
Engine Shutdown. The MIL will light and the engine
will immediately shutdown, stopping spark with the
fuel lock-off closing.
Delayed Engine Shutdown:
Some faults such as
low oil pressure will cause the MIL to illuminate for 30
seconds and then shutdown the engine.
Disable Throttle:
The throttle moves to its default
position. The engine will run at idle but will not
accelerate.
Limp Home Mode:
A “limp home” mode reduces
the lift truck power, and is provided to enable the
operator to drive the lift truck in an unsafe situation
but not use the truck for normal operation.
MIL ONLY:
The MIL will light by an active low signal
provided by the SECM, indicating a fault condition but
no further action will take place.
ON ON
ON
OFF OFF
= CODE 12
Malfunction Indicator Light (MIL)
