CR-V 2007-2008

Powertrain Control Module

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Operation



Specific to:

Honda CR-V 2007-2008

The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent drivability and fuel economy. The Powertrain Control Module (PCM) is the control center of this system. The PCM monitors numerous engine and vehicle functions. The PCM constantly looks at the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The PCM also performs the diagnostic tests on various parts of the system. The PCM can recognize operational problems and alert the driver via the Malfunction Indicator Lamp (MIL). When the PCM detects a malfunction, the PCM stores a Diagnostic Trouble Code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the PCM. The following are some of the functions that the PCM controls:



The ignition system
 
The Knock Sensor (KS) system
 
The Evaporative Emissions (EVAP) system
 
The alternator
 
The A/C and fan systems
 
The cooling fan control
 
The fuel injection system
 
The emission control systems
 
The on-board diagnostics
 

Removal & Installation



Specific to:

Honda CR-V 2007-2008

Special tools required (one of the following):



Honda Diagnostic System (HDS) tablet tester
 
Honda Interface Module (HIM) and an iN workstation with the latest software version
 
HDS pocket tester
 
GNA600 and an iN workstation with the latest software version
 


NOTE
Make sure the HDS is loaded with the latest software version. If you are replacing the PCM after substituting a known-good PCM, reinstall the original PCM, then do this procedure. During the procedure, if any READ DATA, WRITE DATA, or other data checks fail, note the failure, then continue.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Connect the HDS to the Data Link Connector (DLC) located under the driver's side of the dashboard.
  4.  
  5. Turn the ignition switch to ON (II).
  6.  
  7. Make sure the HDS communicates with the PCM and other vehicles systems.
  8.  
  9. Select the PGM-FI system with the HDS.
  10.  
  11. Select the INSPECTION MENU with the HDS.
  12.  
  13. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the screen prompts.
    NOTE
    If the TP POSITION CHECK indicates FAILED, continue with this procedure.

  14.  
  15. Select the REPLACE PCM MENU, then select READ DATA and follow the screen prompts.
    NOTE
    Doing this step copies (READS) the engine oil life data from the original PCM so you can later download (WRITES) it into the new PCM. If READ DATA indicates FAILED, continue with this procedure.

  16.  
  17. Select the A/T system with the HDS.
  18.  
  19. Select the REPLACE TCM/PCM MENU, then select READ DATA and follow the screen prompts.
    NOTE
    Doing this step copies (READS) the ATF life data from the original PCM so you can later download (WRITES) it into the new PCM. If READ DATA indicates FAILED, continue with this procedure.

  20.  
  21. Turn the ignition switch to LOCK (0).
  22.  
  23. Remove the under-hood fuse/relay box (A).
  24.  
  25. Remove the harness bracket (B).
  26.  
  27. Loosen the battery hold down bolt (D), and reposition the battery away from the PCM.
  28.  
  29. Remove the PCM cover (C).

    Click image to see an enlarged view

    Fig. Powertrain Control Module (PCM) location

  30.  
  31. Remove the bolts (D), then remove the PCM (E).
  32.  
  33. Disconnect the PCM connectors (A, B, C).
    NOTE
    The PCM connectors A, B, and C have symbols embossed on them for identification. See illustration.



    Click image to see an enlarged view

    Fig. Disconnect the PCM connectors and remove the PCM

  34.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Turn the ignition switch to ON (II).
  4.  
  5. Manually input the VIN to the PCM with the HDS.
    NOTE
    DTC P0630 VIN Not Programmed or Mismatch may be stored because the VIN has not been programmed into the PCM; ignore it, and continue this procedure.

  6.  
  7. If the READ DATA (engine oil life) failed in step 9 of removal, go to step 7 below. Otherwise, go to the next step.
  8.  
  9. Select the PGM-FI system with the HDS.
  10.  
  11. Select the REPLACE PCM MENU, then select WRITE DATA and follow the screen prompts.
    NOTE
    If the WRITE DATA indicates FAILED, continue with this procedure.

  12.  
  13. If the READ DATA (ATF life) failed in step 11 of removal, go to step 9 below. Otherwise go to the next step.
  14.  
  15. Select the A/T SYSTEM with the HDS.
  16.  
  17. Select the REPLACE TCM/PCM MENU, then select WRITE DATA and follow the screen prompts.
    NOTE
    If the WRITE DATA indicates FAILED, continue with this procedure.

  18.  
  19. Select IMMOBI system with the HDS.
  20.  
  21. Enter the immobilizer code with the PCM replacement procedure in the HDS; this allows you to start the engine.
  22.  
  23. If the TP POSITION CHECK failed in step 7 of removal, clean the throttle body, then go to the next step.
  24.  
  25. If the READ DATA failed in step 8 of removal or the WRITE DATA failed in step 6 in installation, replace the engine oil and engine oil filter, then go to the next step.
  26.  
  27. If the READ DATA failed in step 11 of removal or the WRITE DATA failed in step 9 of installation, replace the ATF, then go to the next step.
  28.  
  29. Select PGM-FI system and reset the PCM with the HDS.
  30.  
  31. Update the PCM if it does not have the latest software.
  32.  
  33. Perform the PCM idle learn procedure.
  34.  
  35. Perform the CKP pattern learn procedure.
  36.  

CKP Pattern Clear/CKP Pattern Learn
With Honda Diagnostic System (HDS)

Specific to:

Honda CR-V 2007-2008

  1. Connect the Honda Diagnostic System (HDS) to the Data Link Connector (DLC) located under the driver's side of the dashboard.
  2.  
  3. Turn the ignition switch to ON.
  4.  
  5. Make sure the HDS communicates with the PCM and other vehicle systems. If it does not, go to the DLC circuit troubleshooting.
  6.  
  7. Select CRANK PATTERN in the ADJUSTMENT MENU with the HDS.
  8.  
  9. Select CRANK PATTERN LEARNING with the HDS and follow the screen prompts.
  10.  

Without Honda Diagnostic System (HDS)

Specific to:

Honda CR-V 2007-2008

  1. Start the engine.
  2.  
  3. Hold the engine speed at 3,000 RPM without load (in P or N) until the radiator fan comes on.
  4.  
  5. Test-drive the vehicle on a level road: decelerate (with the throttle fully closed) from an engine speed of 2,500 RPM down to 1,000 RPM with the transaxle in 2 position.
  6.  
  7. Repeat step 3 several times.
  8.  
  9. Turn the ignition switch to LOCK.
  10.  
  11. Turn the ignition switch to ON and wait 30 seconds.
  12.  

PCM Idle Learn Procedure-With HDS

Specific to:

Honda CR-V 2007-2008

  1. Connect the Honda Diagnostic System (HDS) to the Data Link Connector (DLC) located under the driver's side of the dashboard.
  2.  
  3. Turn the ignition switch to ON.
  4.  
  5. Make sure the HDS communicates with the PCM and other vehicle systems. If it does not, go to the DLC circuit troubleshooting.
  6.  
  7. Select CRANK PATTERN in the ADJUSTMENT MENU with the HDS.
  8.  
  9. Select CRANK PATTERN LEARNING with the HDS and follow the screen prompts.
  10.  

PCM Idle Learn Procedure-Without HDS

Specific to:

Honda CR-V 2007-2008

  1. Start the engine.
  2.  
  3. Hold the engine speed at 3,000 RPM without load (in P or N) until the radiator fan comes on.
  4.  
  5. Test-drive the vehicle on a level road: decelerate (with the throttle fully closed) from an engine speed of 2,500 RPM down to 1,000 RPM with the transaxle in 2 position.
  6.  
  7. Repeat step 3 several times.
  8.  
  9. Turn the ignition switch to LOCK.
  10.  
  11. Turn the ignition switch to ON and wait 30 seconds.
  12.  

Testing



Specific to:

Honda CR-V 2007-2008

  1. Perform a careful underhood inspection when performing any diagnostic procedure or diagnosing the cause of an emission test failure. This can often lead to repairing a condition without further steps. Use the following guidelines when performing an inspection:
    1. Inspect all of the vacuum hoses for correct routing, pinches, cuts, or disconnects.
    2.  
    3. Inspect any hoses that are difficult to see.
    4.  
    5. Inspect all of the wires in the engine compartment for the following conditions:

      Burned or chafed spots
       
      Pinched wires
       
      Contact with sharp edges
       
      Contact with hot exhaust manifold
       

    6.  

  2.  

The Powertrain Control Module (PCM) is programmed with test routines that test the operation of the various systems the PCM controls. Some tests monitor internal PCM functions. Many tests are run continuously. Other tests run only under specific conditions, referred to as conditions for running the Diagnostic Trouble Code (DTC). When the vehicle is operating within the conditions for running a particular test, the PCM monitors certain parameters and determines if the values are within an expected range. The parameters and values considered outside the range of normal operation are listed as conditions for setting the DTC. When the conditions for setting the DTC occur, the PCM executes the action taken when the DTC sets. Some DTC-s alert the driver via the Malfunction Indicator Lamp (MIL) or a message. Other DTC-s do not trigger a driver warning, but are stored in memory. The PCM also saves data and input parameters when most DTC-s are set.

The DTC-s are categorized by type. The DTC type is determined by the MIL operation and the manner in which the fault data is stored when a particular DTC fails. In some cases, there may be exceptions to this structure. Therefore, when diagnosing the system it is important to read the action taken when the DTC sets and the conditions for clearing the DTC.

Many intermittent open or shorted circuits come and go with harness and connector movement caused by vibration, engine torque, bumps, or rough pavement.

  1. Test the wiring harness and connectors by performing the following:

    Move the related PCM connectors and wiring while monitoring the appropriate scan tool data
     
    With the engine running, move the related connectors and wiring while monitoring engine operation
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary
     

  2.  
  3. Test the electrical connections and/or wiring by performing the following:

    Inspect for incorrect mating of the connector halves or terminals not fully seated in the connector body
     
    Inspect for improperly formed or damaged terminals. Test for incorrect terminal tension
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits
     
    Inspect for wires that are broken inside the insulation
     

  4.  
  5. Test the PCM ground circuit:
    1. Measure resistance between the PCM and a good chassis ground. Resistance specification: 1 ohm or less.
    2.  
    3. Use the backside of the PCM harness connector as the PCM side check point.
    4.  
    5. If a problem is found, make the necessary repairs.
    6.  

  6.  
  7. If a problem is not located through the above procedures, the PCM may be faulty.
  8.  
  9. Replace the PCM with a new one and then check the vehicle again. If the vehicle operates normally, then the problem was likely with the PCM.
  10.  

 
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