Blue Bird Coachworks 450 LXi, Owner'S Manual

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5-2 Engine Messenger System
450 LXi Owner Manual
~ 5-2-24 ~ Rev. “C”
5-2.10 Diagnostic Data” Screens
The display will automatically indicate certain diagnostic codes as the codes occur. The “DIAGNOSTIC DATA” screens provide
the advantage of indicating the reason that the Check Engine lamp has come on. The codes will be displayed with the PID-
FMI diagnostic code (Parameter Identifi er and Failure Mode Identifi er) and a brief text description. If more than one code
is active, pressing the Down arrow button will scroll through the remaining codes. An active diagnostic code that becomes
inactive will disappear from the screen. Press the Right arrow button in order to return to the title screen. The display will
indicate other codes or “No Active Codes”.
Table 13 - Automatically Displayed Diagnostic Codes
PID-FMI “Code Description”
100-11 “Very Low Oil Pressure”
110-11 “Very High Coolant Temperature”
111-11 “Very Low Coolant Level”
100-01 “Low Oil Pressure Warning”
110-00 “High Coolant Temperature Warning”
111-01 “Low Coolant Level Warning”
105-00 “High Inlet Manifold Temp Warning”
105-11 “Very High Inlet Manifold Temp”
The diagnostic codes in the above table (table 13) will be displayed whenever the codes are active. The display will continue
to show these codes until any button is pressed. The display will continue to show these codes until the diagnostic goes from
an active state to an inactive state. If no other codes are active, the Messenger display will return to the screen that was
displayed before the diagnostic event.
The diagnostic codes may alert the driver to conditions that may damage engine components. The diagnostic codes 100-11
“Very Low Oil Pressure”, 111-11 “Very Low Coolant Level”, and 110-11 “Very High Coolant Temperature” indicate that the
engine is experiencing a serious problem.
5-2.10.1 Procedure to Address the Occurrence of Codes
Whenever a diagnostic code occurs, try to note all operating conditions of the vehicle. It is especially critical to take note of
the operating conditions for intermittent codes. This information provides the technicians with the operating conditions at the
time of the intermittent code. This will enhance the technician’s ability to produce the code again. This will also enhance the
technician’s ability to diagnose the problem. The codes are recorded in the ECM and the codes may be recovered with the
electronic service tool.
NOTE: Depending on the engine confi guration, the engine may shut down when
a potentially serious engine problem diagnostic code becomes active. The driver will
be provided a warning before engine shutdown.