Caliber L4-2.0L (2008)
operation. The PCM also determines the appropriate transmission shift schedule and shift points, depending on the present operating conditions and
driver demand. The PCM regulates the cooling fan, air conditioning and speed control systems. The PCM changes generator charge rate by adjusting the
generator field. The PCM also performs diagnostics.
The PCM adjusts injector pulse width (air-fuel ratio) based on the following inputs.
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Battery voltage
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Coolant temperature
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Exhaust gas content (oxygen sensor)
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Engine speed (crankshaft position sensor)
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Intake air temperature
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Manifold absolute pressure
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Throttle position
The PCM adjusts ignition timing based on the following inputs.
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Coolant temperature
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Engine speed (crankshaft position sensor)
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Knock sensor
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Manifold absolute pressure
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Throttle position
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Transmission gear selection (park/neutral switch)
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Intake air temperature
The PCM also adjusts engine idle speed through the idle air control motor based on the following inputs.
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Air conditioning sense
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Battery voltage
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Brake switch
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Coolant temperature
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Engine speed (crankshaft position sensor)
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Engine run time
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Manifold absolute pressure
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Power steering pressure switch
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Throttle position
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Transmission gear selection (park/neutral switch)
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Vehicle distance (speed)
The camshaft position sensor and crankshaft position sensor signals are sent to the PCM. If the PCM does not receive the signal within approximately 1
second of engine cranking, it deactivates the fuel pump. When these are deactivated, power is shut off to the fuel injectors, ignition coils, oxygen sensor
heating elements and fuel pump.
The PCM contains a voltage converter that changes battery voltage to a regulated 5 volts direct current to power the camshaft position sensor, crankshaft
position sensor, manifold absolute pressure sensor, throttle position sensor, A/C pressure switch, A/C pressure transducer, and vehicle speed sensor.
5 Volt Supply - PCM Output
5 VOLT SUPPLY - PCM OUTPUT
The PCM supplies two regulated 5 volts supplies - a 5V primary and a 5V secondary (auxiliary) to the following sensors:
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Camshaft Position Sensor (5V secondary)
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Crankshaft Position Sensor (5V primary)
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EGR Position feedback sensor (5V secondary) (if equipped)
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Engine coolant temperature sensor (connected to 5V internal via a pullup resistor)
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Inlet Air Temperature Sensor (connected to 5V internal via a pullup resistor)
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Knock sensor (connected to 5V internal via a pullup resistor)
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Manifold absolute pressure sensor (5V secondary)
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Oil Pressure Switch (connected to 5V internal via pullup resistor)
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Pedal Value Sensor #1 (5V Primary)
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Pedal Value Sensor #2 (5V Secondary)
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SRV Position Feedback Sensor (5V Secondary)
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Throttle Position Sensors (5V Primary)
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Variable Line Pressure Sensor (5V Secondary)
