G643(E) Service Manual
Chapter 8. Advanced Diagnostics
250
Chapter 8. ADVANCED DIAGNOSTICS
MI-07 systems are equipped with built-in fault
diagnostics. Detected system faults can be
displayed by the Malfunction Indicator Lamp (MIL)
as Diagnostic Fault Codes (DFC) or flash codes,
and viewed in detail with the use of the Service Tool
software. When the ignition key is turned on, the MIL
will illuminate and remain on until the engine is
started. Once the engine is started, the MIL lamp will
go out unless one or more fault conditions are
present. If a detected fault condition exists, the fault
or faults will be stored in the memory of the small
engine control module (SECM). Once an active fault
occurs the MIL will illuminate and remain ON. This
signals the operator that a fault has been detected
by the SECM.
Reading Diagnostic Fault Codes
G643E Engines
All fault codes are three-digit codes. When the fault
codes are retrieved (displayed) the MIL will flash for
each digit with a short pause (0.5 seconds) between
digits and a long pause (1.2 seconds) between fault
codes. A code 12 is displayed at the end of the code
list.
EXAMPLE:
A code 461 (ETCSticking) has been
detected and the engine has shut down and the MIL
has remained ON. When the codes are displayed
the MIL will flash four times (4), pause, then flash six
times (6), pause, then flash one time (1) This
identifies a four sixty one (461), which is the
ETCSticking fault. If any additional faults were
stored, the SECM would again have a long pause,
then display the next fault by flashing each digit.
Since no other faults were stored there will be a long
pause then one flash (1), pause, then two flashes
(2). This identifies a twelve, signifying the end of the
fault list. This list will then repeat.
G643 Engines
All fault codes are two digit codes. When the fault
codes are retrieved (displayed) the MIL will flash for
each digit with a short pause (.5 seconds) between
digits and a long pause (1.2 seconds) between fault
codes. A code 12 is displayed at the beginning of
the code list.
EXAMPLE:
A code 26 has been detected
(ETCSticking) and the engine has shutdown and the
MIL has remained
ON.
When the codes are
displayed the MIL will flash one time (1), pause, then
flash two times (2). This identifies a twelve (12),
which is the beginning of the fault list. It will then
pause for 1.2 seconds (long pause) and flash two
times (2), pause, then flash six times (6). This
identifies a twenty-six (26), which is the ETCSticking
fault. If any additional faults were stored the SECM
would again have a long pause, then display the
next fault by flashing each digit. Since no other
faults were stored there will be a long pause then
one flash (1), pause, then two flashes (2). This
identifies a twelve meaning the fault list will begin
again.
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 foot pedal by depressing
it to the floor and then fully releasing the pedal
(pedal maneuver). You must fully cycle the foot
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.
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 foot pedal
by depressing it to the floor and then fully releasing
the pedal (pedal maneuver). You must fully cycle the
foot 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.
Software released after level
MI07SEQ062V05_***.mfu allows fault codes to be
cleared while displaying the fault codes. You must
fully cycle the foot pedal ten (10) times within five (5)
seconds to clear the fault code list of the SECM.
The fault code list will continue to display until the
end of the list is reached.
