Santa Fe, Vera Cruz 2006-2008

Powertrain Control Module

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Operation



Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 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:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Turn the ignition switch OFF .
  4.  
  5. Disconnect the negative battery cable from the battery.
  6.  
  7. Disconnect the PCM connectors.
  8.  
  9. Remove the PCM mounting bolts.
  10.  
  11. Remove the PCM from the engine compartment.
  12.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the PCM mounting bolts to: 86-104 inch lbs. (10-12 Nm).
  4.  

Testing



Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 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. Hyundai recommends to 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.  
  11. Retest the original PCM, if possible, by installing it into a known-good vehicle and check vehicle operations.
  12.  

 
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