User Manual

RENR9968-02 9
Systems Operation Section
The ECM also monitors all sensor inputs and the
ECM provides the correct outputs in addition to
acting as a po w er supply. Also, the ECM ensures the
desired engine operatio n.
TheECMisprogrammedwithaselectedfactory
engine rating. The ECM memory contains a
personality module identification code. This
code is used to avoid u nauthorized tampering or
switching of personality modules and other pertinent
manufacturing information.
The wiring harness provides communications to the
following are as:
•
ECM
•
Various sensors
•
Data link connector
•
Engine connectors
TheECMisprogrammedtoperformthefollowing
functions:
•
Diagnostic tests on all inputs
•
Diagnostic tests on all outputs
•
Identify a faulty circuit.
Once a fault is detected, the fault can be displayed
on a diagnostic lamp. The diagnostic code can be
read by using Cat ET. A multimeter can be used to
check most problems. Also, a multim eter can be used
to troubleshoot most problems. The ECM will record
most diagnostic codes that are generated during
engine operation. These logged codes or intermittent
codes can be read by Cat E T.