Section 06 ENGINE MANAGEMENT (RFI)
Subsection 01 (OVERVIEW)
ECM and VCM Interaction with the Electrical System
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ENGINE MANAGEMENT
ELECTRONIC FUEL INJECTION
The ECM receives the signals from 5 sensors
which indicate engine operating conditions at
millisecond intervals.
– Throttle Position Sensor (TPS)
– Crankshaft Position Sensor (CPS)
– Air Temperature Sensor (ATS)
– Water Temperature Sensor (WTS)
– Air Pressure Sensor (APS).
These signals are used by the ECM to determine
the injection duration required for optimum air-fuel
ratio.
To activate an injector, the ECM completes the
injector circuit to ground.
IGNITION TIMING
The ECM is programmed with data for optimum
ignition timing under all operating conditions. Us-
ing data provided by the sensors, the ECM con-
trols the ignition timing for optimum engine oper-
ation.
A double ignition coil provides high voltage to each
spark plug individually.
The ECM completes the ignition coil primary wind-
ing to ground to produce a spark.
RAVE VALVE ACTIVATION
The ECM is programmed with data to control the
RAVE valves operation.
To open the RAVE valves, The ECM completes the
RAVE solenoid coil circuit to ground.
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