Operation and maintenance manual

Electronic Controlled Fuel System QSB4.5 and QSB6.7
Page 1-10 Section 1 - Operating Instructions
Diagnostic Fault Codes
The control system can show and record operation
anomalies that present themselves as fault codes. These
codes will make troubleshooting easier. The fault codes
are recorded in the ECM. They can be read using the fault
lamps in the dash or with INSITE™ electronic service tool.
NOTE: Not all engine or control system anomalies are
shown as fault codes.
There are three types of system codes:
• Engine electronic control system fault codes
• Engine protection system fault codes
• Engine maintenance indicator codes.
All fault codes recorded will either be active (fault code is
currently active on the engine) or inactive (fault code was
active at some time, but is not active at the moment).
Most of the electronic fault codes will light a lamp when
they are active. There are three possible lamps that can
be lit when a fault is active:
• The WARNING or CHECK ENGINE lamp is yellow
and indicates the need to repair the fault at the first
available opportunity.
• The STOP or STOP ENGINE lamp is red and
indicates the need to stop the engine as soon as it can
be safely done. The engine should remain shut down
until the fault can be repaired.
• The MAINTENANCE or FLUID lamp will illuminate
when an engine maintenance function needs to be
performed.
NOTE: The names and colors of these lamps can vary by
equipment manufacturer.