Town & Country V6-3.3L VIN R (2003)
SENSOR RETURN - PCM INPUT
The sensor return circuit provides a low electrical noise ground reference for all of the systems sensors. The sensor return circuit connects to internal
ground circuits within the Powertrain Control Module (PCM).
SCI RECEIVE - PCM INPUT
SCI Receive is the serial data communication receive circuit for the DRB scan tool. The Powertrain Control Module (PCM) receives data from the
DRB through the SCI Receive circuit.
IGNITION SENSE - PCM INPUT
The ignition sense input informs the Powertrain Control Module (PCM) that the ignition switch is in the crank or run position.
PCM GROUND
Ground is provided through multiple pins of the PCM connector. Depending on the vehicle there may be as many as three different ground pins. There
are power grounds and sensor grounds.
The power grounds are used to control the ground side of any relay, solenoid, ignition coil or injector. The signal ground is used for any input that
uses sensor return for ground, and the ground side of any internal processing component.
The SBEC III case is shielded to prevent RFI and EMI. The PCM case is grounded and must be firmly attached to a good, clean body ground.
Internally all grounds are connected together, however there is noise suppression on the sensor ground. For EMI and RFI protection the case is also
grounded separately from the ground pins.
8-VOLT SUPPLY - PCM OUTPUT
The PCM supplies 8 volts to the crankshaft position sensor, camshaft position sensor.
5 VOLT SUPPLY - PCM OUTPUT
The PCM supplies 5 volts to the following sensors:
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A/C pressure transducer
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Engine coolant temperature sensor
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Manifold absolute pressure sensor
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Throttle position sensor
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Linear EGR solenoid
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Battery temperature
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Knock sensor
