Avenger 2008

Powertrain Control Module

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Operation



Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009

The Powertrain Control Module (PCM) is a digital computer containing a microprocessor. The PCM receives input signals from various switches and sensors referred to as Powertrain Control Module Inputs. Based on these inputs, the PCM adjusts various engine and vehicle operations through devices referred to as Powertrain Control Module Outputs.

PCM Inputs:



Air Conditioning Pressure Transducer
 
ASD/Main Relay
 
Battery Voltage
 
Brake Switch
 
Camshaft Position Sensor
 
Crankshaft Position Sensor
 
Distance Sensor (from transmission control module)
 
EGR Position Feedback (if equipped)
 
Engine Coolant Temperature Sensor
 
Heated Oxygen Sensors
 
Ignition sense
 
Inlet Air Temperature Sensor
 
Knock Sensor
 
Manifold Absolute Pressure (MAP) Sensor
 
Park/Neutral (from trans range sensor)
 
Power Steering Pressure Switch
 
Proportional Purge Sense
 
CAN C Bus
 
Speed Control
 
Transmission Control Relay (Switched B+)
 
Transmission Pressure Switches
 
Transmission Temperature Sensor
 
Transmission Input Shaft Speed Sensor
 
Transmission Output Shaft Speed Sensor
 
Vehicle Speed
 

PCM Outputs:



Air Conditioning Clutch Relay
 
Data Link Connector (CAN C Bus)
 
Double Start Override
 
EGR Solenoid (if equipped)
 
Fuel Injectors
 
Generator Field
 
High Speed Fan Relay
 
Ignition Coils
 
Natural Vacuum Leak Detection
 
Low Speed Fan Relay
 
MTV Actuator
 
Proportional Purge Solenoid
 
SRV Valve
 
Speed Control Relay
 
Speed Control Vent Relay
 
Speed Control Vacuum Relay
 
Torque Reduction Request
 
Transmission Control Relay
 
Transmission Solenoids
 
5 Volt Output
 

Based on inputs it receives, the powertrain control module (PCM) adjusts fuel injector pulse width, idle speed, ignition timing, and canister purge operation and EGR if equipped. The PCM regulates the cooling fans, air conditioning and speed control systems. The PCM changes generator charge rate by adjusting the generator field.

The PCM adjusts injector pulse width (air-fuel ratio) based on the following inputs:



Manifold Absolute Pressure
 
Engine Speed (crankshaft position sensor)
 
Battery Voltage
 
Inlet Air Temperature Sensor
 
Engine Coolant Temperature
 
Exhaust Gas Oxygen Content (heated oxygen sensors)
 
Throttle Position
 

The PCM adjusts engine idle speed through the idle air control motor based on the following inputs:



Brake Switch
 
Engine Coolant Temperature
 
Engine Speed (crankshaft position sensor)
 
Park/Neutral
 
Transaxle Gear Engagement
 
Throttle Position
 
Vehicle Speed (from Transmission Control Module)
 

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 camshaft and crankshaft signals are sent to the Powertrain Control Module (PCM). If the PCM does not receive both signals within approximately one second of engine cranking, it deactivates the fuel pump. When 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 5.0 volts. The 5.0 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 scan tool to change the mileage in the PCM. Refer to the appropriate Powertrain Diagnostic Manual and the scan tool. If equipped with SKREEM, must use SKREEM function to program VIN number in new PCM.

Transmission Control

An important function of the PCM is to monitor Clutch Volume Index (CVI). CVIs represent the volume of fluid needed to compress a clutch pack.

The PCM monitors gear ratio changes by monitoring the Input and Output Speed Sensors. The Input, or Turbine Speed Sensor sends an electrical signal to the PCM that represents input shaft rpm. The Output Speed Sensor provides the PCM with output shaft speed information.

By comparing the two inputs, the PCM can determine transaxle gear ratio. This is important to the CVI calculation because the PCM determines CVIs by monitoring how long it takes for a gear change to occur.

Gear ratios can be determined by using the scan tool and reading the Input/Output Speed Sensor values in the -Monitors- display. Gear ratio can be obtained by dividing the Input Speed Sensor value by the Output Speed Sensor value.

For example, if the input shaft is rotating at 1000 rpm and the output shaft is rotating at 500 rpm, then the PCM can determine that the gear ratio is 2:1. In direct drive (3rd gear), the gear ratio changes to 1:1. The gear ratio changes as clutches are applied and released. By monitoring the length of time it takes for the gear ratio to change following a shift request, the PCM can determine the volume of fluid used to apply or release a friction element.

The volume of transmission fluid needed to apply the friction elements are continuously updated for adaptive controls. As friction material wears, the volume of fluid need to apply the element increases.

Certain mechanical problems within the clutch assemblies (broken return springs, out of position snap rings, excessive clutch pack clearance, improper assembly, etc.) can cause inadequate or out-of-range clutch volumes. Also, defective Input/Output Speed Sensors and wiring can cause these conditions.

The PCM supplies two regulated 5 volts supplies - a 5V primary and a 5V secondary (auxiliary) to the following sensors:



Camshaft Position Sensor (5V secondary)
 
Crankshaft Position Sensor (5V primary)
 
EGR Position feedback sensor (5V secondary) (if equipped)
 
Engine coolant temperature sensor (connected to 5V internal via a pull-up resistor)
 
Inlet Air Temperature Sensor (connected to 5V internal via a pull-up resistor)
 
Knock sensor (connected to 5V internal via a pull-up resistor)
 
Manifold absolute pressure sensor (5V secondary)
 
Oil Pressure Switch (connected to 5V internal via pull-up resistor)
 
Pedal Value Sensor #1 (5V Primary)
 
Pedal Value Sensor #2 (5V Secondary)
 
SRV Position Feedback Sensor (5V Secondary)
 
Throttle Position Sensors (5V Primary)
 
Variable Line Pressure Sensor (5V Secondary)
 

Removal & Installation



2.4L Engine

Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009


CAUTION
Do not disconnect the Powertrain Control Module (PCM) electrical connectors before the ignition key is in the off position and the battery cable disconnected. If these steps are not preformed damage to the PCM may result from a voltage spike.


NOTE
Note radio programs prior to disconnecting the battery.

  1. Disconnect and isolate negative battery cable at battery.
  2.  
  3. Remove the Air Cleaner Housing.
  4.  
  5. Disconnect the electrical connectors (3) from PCM.

    Click image to see an enlarged view

    Fig. Disconnect the electrical connectors (3) from PCM

  6.  
  7. Remove nut (1) from upper shock tower stud.
  8.  
  9. Remove bolt (2) from lower shock tower fastener.
  10.  
  11. Remove the PCM and bracket (4) from vehicle.
  12.  
  13. Remove bolts (3) and separate the PCM (2) from bracket (1).

    Click image to see an enlarged view

    Fig. Remove bolts (3) and separate the PCM (2) from bracket (1)

  14.  

To install:

  1. Install the Powertrain Control Module (PCM) to bracket.
  2.  
  3. Install the PCM and bracket to vehicle.
  4.  
  5. Install bolt to lower shock tower fastener and tighten to 80 inch lbs. (9 Nm).
  6.  
  7. Install nut to upper shock tower stud and tighten to 80 inch lbs. (9 Nm).
  8.  
  9. Connect the electrical connectors to PCM.
  10.  
  11. Install Air Cleaner Housing.
  12.  
  13. Connect negative battery cable.
  14.  
  15. Reprogram radio stations and time.
  16.  
  17. Program the PCM.
  18.  

2.7L And 3.5L Engines

Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009


CAUTION
Do not disconnect the Powertrain Control Module (PCM) electrical connectors before the ignition key is in the off position and the battery cable disconnected. If these steps are not preformed damage to the PCM may result from a voltage spike.


CAUTION
Note radio programs prior to disconnecting the battery.

  1. Disconnect and isolate negative battery cable at battery.
  2.  
  3. Remove the Air Cleaner Housing,.
  4.  
  5. Disconnect the electrical connectors (2) from PCM.

    Click image to see an enlarged view

    Fig. Disconnect the electrical connectors (2) from PCM

  6.  
  7. Remove nut (1) from upper shock tower stud.
  8.  
  9. Remove bolt (3) from lower shock tower fastener.
  10.  
  11. Remove the PCM and bracket (4) from vehicle.
  12.  
  13. Remove bolts (3) and separate the PCM (2) from bracket (1).

    Click image to see an enlarged view

    Fig. Remove bolts (3) and separate the PCM (2) from bracket (1)

  14.  

To install:

  1. Install the Powertrain Control Module (PCM) to bracket.
  2.  
  3. Install the PCM and bracket to vehicle.
  4.  
  5. Install bolt to lower shock tower fastener and tighten to 80 inch lbs. (9 Nm).
  6.  
  7. Install nut to upper shock tower stud and tighten to 80 inch lbs. (9 Nm).
  8.  
  9. Connect the electrical connectors to PCM.
  10.  
  11. Install Air Cleaner Housing.
  12.  
  13. Connect negative battery cable.
  14.  
  15. Reprogram radio stations and time.
  16.  
  17. Program the PCM.
  18.  

Reset Procedure



Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009

Use the scan tool to reprogram the new PCM with the vehicle's original identification number (VIN) and the vehicle's original mileage. If this step is not done a Diagnostic Trouble Code (DTC) may be set.

When a Powertrain Control Module (PCM) and the Sentry Key Remote Entry Module (SKREEM) (also known as the Wireless Control Module/WCM) on vehicles equipped with the Sentry Key Immobilizer System (SKIS) are replaced at the same time, perform the following steps in order:


NOTE
If the PCM and the SKREEM are replaced at the same time, program the PCM VIN into the PCM first.

  1. If applicable first replace the PCM with the original WCM still connected to the vehicle.
  2.  
  3. Using the appropriate service information program the new PCM. (This will ensure the Secret Key Transfer from the original WCM into the new PCM).
  4.  
  5. Now replace and program the WCM. This will retain the Secret Key from the PCM back into the new WCM.
  6.  
  7. With the scan tool, select Miscellaneous Functions, WCM/Wireless Control Module. Then select the desired procedure and follow the display on the scan tool.
  8.  
  9. If the vehicle is equipped with Tire Pressure Monitoring System program the Placard Pressure Values into the WCM/SKREEM.
  10.  
  11. Ensure all the customer's keys have been programmed into the new module if necessary.
    NOTE
    If the original keys do not successfully program to the new SKREEM after the proper procedures are followed correctly, programming new keys will be necessary.

  12.  

Testing



Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009

Refer to the appropriate Diagnostic Trouble Code (DTC) for testing and/or diagnosis procedures.

 
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