25 Rev-5 Dec 2, 2019
DIAGNOSTICS
How to manage and retrieve fault codes
A MIL (malfunction indicator lamp) is provided to notify the engine operator
of potential problems with the emissions control system. With the key ON
and engine OFF the MIL will illuminate to indicate it is functioning properly. If
the key switch is ON and the engine is OFF and the MIL is not illuminated
there is a problem with the MIL circuit. Diagnose and repair this problem
before proceeding.
If the key is ON and an active fault exists, the MIL will automatically flash.
The flashing sequence indicates the DTC that occurred. DTC’s are 3 digit
codes. Count the flashes to determine which DTC is set.
If the engine is stopped the MIL flashes a '12' code before and after an active
fault that might exist. If the engine is running it will flash just the fault code.
Refer to the following table to determine which fault(s) is set.
Faults can also be viewed through the CAN Gauge, if so equipped. Faults
are located near the end of the
Live Data
group. Faults can be viewed and
cleared with the CAN Gauge, simply follow the steps when prompted.
Faults can also be viewed through the use of a PC tool with the appropriate
software and communications cable. The PC is most often used by the
service technician when more detailed diagnostic information is required.
The action taken when a fault occurs can be different for each fault. The
engine manufacturer (MOR) assigns these actions based on the specific
application of the engine. Fault actions include illumination of the MIL, power
limiting, engine shutdown, delayed engine shutdown, cut throttle, and disable
closed-loop fuel control.
A DTC normally requires a service technician to diagnose and repair the
problem. If the MIL is illuminated it is recommended that the engine be
stopped and repaired immediately to avoid potential damage to the engine or
non-compliance.
If the fault condition disappears on its own, the MIL will stay illuminated for
three (3) consecutive engine starts subsequent to the fault condition no
longer existing, after which the MIL will turn off by itself. Refer to Service
Manual or call your authorized service center for additional diagnostic and
service information.
Summary of Contents for NA428
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