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CHAPTER 5 MI-04 LP ADVANCED DIAGNOSTICS
Advanced Diagnostics
The MI-04 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 service tool software.
When the ignition key is turned ON the MIL will
perform a self-test, illuminate once and then go OFF.
If a detected fault condition exists, the fault or faults
will be stored in the memory of the small engine
control module (SECM). Once a fault occurs the MIL
will illuminate and remain ON. This signals the
operator that a fault has been detected by the SECM.
1
(1) Malfunction Indicator Lamp (MIL) for Engine control system
Tier
G420E/G424E
IB1O003L
LP Engine
Reading Diagnostic Fault
Codes
All MI-04 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.
44
Advanced Diagnostics
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