AutoZone 2000 Pontiac Trans Am 5.7L SFI 8cyl | Repair Guides | Driveability And Emission Controls | Electronic Engine Controls | Engine Control Module (ecm) | AutoZone.com

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    Honda CRV/Odyssey 1995-2000 Repair Information

    Engine Control Module (ECM)

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    OPERATION



    The term Powertrain Control Module (PCM) is used in this guide to refer to the engine control computer, whether it is a Powertrain Control Module (PCM) or an Engine Control Module (ECM).

    The heart of the electronic engine management system, which is found on the vehicles covered by this guide, is the Engine or Powertrain control module (ECM/PCM). On vehicles equipped with a manual transaxle, there is no need for a control unit to control shift points as the transaxle is shifted manually. On these models, the engine management system uses an ECM. The 1995 Odyssey models used a separate Transmission Control Module (TCM) that linked with the ECM to control the automatic transaxle shift points.

    Beginning with the 1996 Odyssey and 1997 CRV models equipped with an automatic transaxle, the TCM and ECM have been combined into one unit, called the Powertrain Control Module (PCM). The PCM processes input information from various sensors, compares the input with pre-programmed information and sends output signals to control the fuel supply, ignition timing, and the engine emission system. The PCM also controls the shift functions of the on vehicles equipped with an automatic transaxle.

    Regardless of who the manufacturer may be, all computer control modules are serviced in a similar manner. Care must be taken when handling these expensive electronic components in order to protect them from damage. Carefully follow all instructions included with the replacement part. Avoid touching pins or connectors to prevent damage from static electricity or contaminating the electrical connection. Some input voltages and resistance values are quite small and the readings very sensitive. A poor electrical connection could drastically affect the values recognized by the PCM and cause a poor running condition.

    As the PCM is a sensitive electronic component and must be kept away from areas of heat, debris and fluids, the PCM is located in the interior on both the CRV and Odyssey models. The PCM is located as follows:



    CRV models: Behind the front passenger's right side kick panel
     
    1995-98 Odyssey models: Behind the front passenger's right side footrest
     
    1999-00 Odyssey models: In lower portion of the center console
     

    All of the computer control modules contain a Programmable Read Only Memory (PROM) chip that contains calibration information specific to the vehicle application.


    WARNING
    To prevent the possibility of permanent control module damage, the ignition switch MUST always be OFF when disconnecting power from or reconnecting power to the module. This includes unplugging the module connector, disconnecting the negative battery cable, removing the module fuse or even attempting to jump start your dead battery using jumper cables.

    In case of an ECM failure, the system will default to a pre-programmed set of values. These are compromise values which allow the engine to operate, although at a reduced efficiency. This is variously known as the default, limp or back-up mode. Driveability is usually affected when the ECM enters this mode and should trigger the Malfunction Indicator Lamp (MIL) indicator.

    REMOVAL & INSTALLATION



    Sometimes substituting a known good ECM/PCM can be helpful when attempting to diagnose a problem in the engine management system. When substituting a control unit, make sure that both control units are identical. Installing the wrong control unit could damage the substituted unit, and/or possibly damage other related sensors or components in the vehicle being tested.

    The control units are very sensitive to changes in the charging system operating voltage and voltage spikes. Make sure the alternator and battery are functioning properly. An alternator that is over charging will not only damages the battery, the voltage output may be enough to cause damage to other electrical components and control units.

    Operating a vehicle with a discharged or defective battery can cause the vehicle's charging system to be overworked. Never operate a vehicle with a battery cable disconnected. If the vehicle requires a jump start, be careful to connect the battery cables properly, and wait at least one minute after the cables have been installed the start the vehicle.

    If the PCM must be replaced on a 1998 2.3L or 1999-00 V6 Odyssey, the immobilizer code must be rewritten using a Honda PGM Tester in order for the engine to start.

    CRV and 4-Cylinder Odyssey Models

    1. Make sure the ignition switch is turned OFF , then disconnect the negative battery cable.
    2.  


    WARNING
    To prevent the possibility of permanent control module damage, the ignition switch MUST always be OFF when disconnecting power from or reconnecting power to the module. This includes unplugging the module connector, disconnecting the negative battery cable, removing the module fuse or even attempting to jump your dead battery using jumper cables.

    1. Locate the computer control module.
    2.  
    3. On CRV models, remove the front passenger's right side kick panel.
    4.  
    5. On 4-cylinder Odyssey models, if necessary, remove the right side door sill molding, then pull back the front passenger's carpet and remove the control unit cover.
    6.  
    7. Remove the control module mounting hardware.
    8.  
    9. Detach the electrical connectors from the control module.
    10.  
    11. Remove the control module.
    12.  

    See Figures 1 and 2

    Click image to see an enlarged view

    Fig. Fig. 1: The PCM is located behind the front passenger's right side kick panel on CRV models



    Click image to see an enlarged view

    Fig. Fig. 2: On 4-cylinder Odyssey models, the PCM is located behind the front passenger foot rest

    To install:
    1. Attach the electrical connectors to the computer control module.
    2.  
    3. Position the control module in its mounting location and secure with the mounting hardware.
    4.  
    5. Install the remaining items in the reverse order of disassembly.
    6.  
    7. Check that the ignition switch is OFF , then connect the negative battery cable.
    8.  

    On 1998 2.3L Odyssey models, the immobilizer code must be rewritten using a Honda PGM Tester in order for the engine to start.

    V6 Odyssey Models

    If the PCM must be replaced on a V6 Odyssey, the immobilizer code must be rewritten using a Honda PGM Tester in order for the engine to start.

    1. Make sure the ignition switch is turned OFF , then disconnect the negative battery cable.
    2.  


    WARNING
    To prevent the possibility of permanent control module damage, the ignition switch MUST always be OFF when disconnecting power from or reconnecting power to the module. This includes unplugging the module connector, disconnecting the negative battery cable, removing the module fuse or even attempting to jump your dead battery using jumper cables.

    1. Locate the computer control module.
    2.  
    3. Pull back both front carpets.
    4.  
    5. Remove the passenger's and driver's side lower center console covers.
    6.  
    7. Remove the PCM cover fasteners and remove the cover through the passenger's side lower center console.
    8.  
    9. Remove the control module mounting hardware.
    10.  
    11. Detach the electrical connectors from the control module.
    12.  
    13. Remove the control module.
    14.  

    To install:
    1. Attach the electrical connectors to the computer control module.
    2.  
    3. Position the control module in its mounting location and secure with the mounting hardware.
    4.  
    5. Install the remaining items in the reverse order of disassembly.
    6.  
    7. Check that the ignition switch is OFF , then connect the negative battery cable.
    8.  

    When substituting a control unit on V6 Odyssey model, the following steps must be followed.

    1. Using a non-immobilizer ignition key blank, cut a temporary ignition key for the vehicle to be tested.
    2.  
    3. Refer to the removal and installation procedures in this section and remove the PCM from both the donor vehicle and the vehicle to be tested. Label each PCM with the vehicle's serial number to avoid confusing the control units.
    4.  
    5. Install the known good PCM into the vehicle to be tested, following the procedures outlined in this section.
    6.  
    7. Tape the ignition key from the donor vehicle to the test vehicle's temporary key head to head so the PCM will recognize the immobilizer code from the donor vehicle, allowing the engine to be started.
    8.  
    9. Once the test is completed reinstall the PCM for each vehicle and destroy the temporary key.
    10.  

    See Figures 3 and 4

    Click image to see an enlarged view

    Fig. Fig. 3: The PCM is located in the lower center console on V6 Odyssey models



    Click image to see an enlarged view

    Fig. Fig. 4: Tape a temporary ignition key (A) to the donor vehicle's immobilizer ignition key (B) when substituting a PCM on V6 Odyssey models

     
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