Stratus Sedan L4-2.4L VIN X (2003)
-
Transaxle Gear Engagement
-
Throttle Position
-
Vehicle Speed (from Transmission Control Module) (SBEC controlled vehicles)
The PCM adjusts ignition timing based on the following inputs.
-
Inlet Air Temperature
-
Engine Coolant Temperature
-
Engine Speed (crankshaft position sensor)
-
Knock Sensor
-
Manifold Absolute Pressure
-
Park/Neutral (from trans range sensor)
-
Transaxle Gear Engagement
-
Throttle Position
The automatic shut down (ASD) and fuel pump relays are mounted externally, but turned on and off by the powertrain control module.
The camshaft and crankshaft signals are sent to the powertrain control module. If the PCM does not receive both signals within approximately one
second of engine cranking, it deactivates the ASD and fuel pump relays. When these relays are deactivated, power is shut off to the fuel injectors,
ignition coils, fuel pump and the heating element in each oxygen sensor.
The PCM contains a voltage converter that changes battery voltage to a regulated 8.0 volts. The 8.0 volts power the camshaft position sensor, and
crankshaft position sensor. The PCM also provides a regulated 5.0 volts supply for the, manifold absolute pressure sensor, throttle position sensor and
EGR (if equipped).
The PCM engine control strategy prevents reduced idle speeds until after the engine operates for 320 km (200 miles). If the PCM is replaced after 320
km (200 miles) of usage, update the mileage in new PCM. Use the DRBIII scan tool to change the mileage in the PCM. Refer to the appropriate
Powertrain Diagnostic Manual and the DRBIII scan tool. If equipped with SKIM, must use SKIM function to program VIN number in new PCM.
OPERATION - 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).
OPERATION - DATA BUS COMMUNICATION RECEIVE - PCM INPUT
The PCM uses the SCI communication bus to preform engine diagnostics and flash operations. The transmission side of the PCM uses the SCI
communication bus to flash new software. However, diagnostics is performed via the vehicles J1850 bus for the transmission side of the PCM.
OPERATION - 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 REPLACEMENT
USE THE DRB SCAN TOOL TO REPROGRAM THE NEW PCM WITH THE VEHICLES ORIGINAL IDENTIFICATION NUMBER (VIN) AND
THE VEHICLES ORIGINAL MILEAGE. IF THIS STEP IS NOT DONE A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET.
OPERATION - PCM GROUND
Ground is provided through multiple pins of the PCM connector. Depending on the vehicle there may be as many as two different ground pins. There are
power grounds and sensor grounds.
The power grounds are used to control the ground side relays, solenoids, ignition coil or injectors. The signal ground is used for any input that uses
sensor return for ground, and the ground side of any internal processing component.
The PCM 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 housing and
cover are also grounded separately from the ground pins.
OPERATION - 8-VOLT SUPPLY - PCM OUTPUT - SBEC CONTROLLER
The PCM supplies 8 volts to the crankshaft position sensor, camshaft position sensor.
OPERATION - 5 VOLT SUPPLY - PCM OUTPUT
