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Troubleshooting with diagnostic codes
3500B engines
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System over view Electronic system consist of :- -ECM -Wiring harness -Switches -Sensors -Electronic unit injector
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Electronic controls ECM:- supplies signal to electronic unit
injectors control engine operation consists of : - hardware and software govern engine speed
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Fuel injection ECM controls timing, duration of
injectors (105v) Timing Quantity of fuel Desired engine RPM
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Injection timing depends on :-
Engine RPM Load Other operational factors
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ECM sends signal at the desired time, limits engine power during cold mode operation, modifies
injection time and cuts out cylinders .This increase startability
and reduce warming time
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Self diagnostic ECM detects problem, generate a
code and an alarm. Diagnostic Events These have two states:- Active Logged
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Electronic service tools Designed to perform the
following functions:- Obtain data from the engine Display diagnostic codes Perform sensor calibrations Read and change programmable
parameters
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ET Display:- Sensor values Diagnostic codes Engine configuration
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ET Perform:- Diagnostic tests Sensor calibration Flash downloading Set programmable
parameters
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Troubleshooting with diagnostic codes
Diagnostic codes :- Alert that a problem exists Indicate the nature of the problem Consists of :-
MID CID FMI
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Engine programmed to perform the following actions:-
Engine warning Engine derate Engine shutdown
electronic service tool used to activate these features
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4.8V
4.2V
2.8V
0.2V
107 ْ c
63 ْْc
Sensor diagnostic generatedElectronic problem
Logged event ,warning, derate and shut down occur if applicable
Engine is too hot but there is not an electronic problem
Warm mode tempRange from 20-106 ْc
Sensor diag. generatedelect. problem
Cold mode temp-40 – 20 ْc
Normal engine
temp range