Kia 2004.5 Spectra Service Technical Training page 125

2004.5 Spectra Technology
PCM INPUTS/OUTPUTS
The PCM receives inputs from many sensors to detect
engine conditions. The PCM processes these inputs to
control systems and actuators such as fuel injection,
idle speed, ignition timing, fuel pump, A/C compressor
clutch relay, fan relay, CVVT, evaporative emission
controls, and A/T shifts.
The Siemens PCM is located on the driver's side, under
PCM LOCATION
the dash, and has two connectors. One connector for
engine management while the other is automatic
transaxle. They conduct input from sensors and other
electronic components. Based on this information
received and software programmed into its processor,
the controller outputs signals to the actuators. To
perform these functions, the PCM generates a 5V
reference signal that's used by several of the engine
sensors and controlled actuators as shown in the
diagram. Other actuators operate on system voltage.
The PCM controls the actuators by switching on the
groundside of the circuit.
ECM performs on-board diagnostics (OBD II) to
identify when the vehicle may be exceeding federal
test procedures (FTP) emission standards. When a
system or component exceeds emission threshold or a
component operates outside tolerance, a Diagnostic
Trouble Code (DTC) will be stored and the MIL may be
illuminated. The OBD II software controls all the
monitors and interactions, DTC and MIL operation,
freeze frame data, and Hi-Scan Tool (HSP) interface.
California emission certified 2004.5 Spectra vehicles
meet the SULEV emission standard due to significant
changes made to exhaust emission and adoption of
CVVT and a zero evaporative emission system instead
of a conventional evaporative system.
Driveability
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