Sentra 2007

Electronic Control Module

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Location



Specific to:

Nissan Sentra 2007-2012



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Fig. ECM is mounted in the engine compartment.

Operation



Specific to:

Nissan Sentra 2007-2012

The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The ECM is the control center of this system. The ECM monitors numerous engine and vehicle functions. The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions.

The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the Malfunction Indicator Lamp (MIL). When the ECM detects a malfunction, the ECM 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 ECM.

Removal & Installation



Specific to:

Nissan Sentra 2007-2012

  1. Disconnect both battery cables.
  2.  
  3. Remove the connector cover and remove the ECM.
  4.  
  5. Unplug the connector.
  6.  
  7. When installing, take care not to bend the pins in the connector.
  8.  

Testing



Specific to:

Nissan Sentra 2007-2012

Use an intelligent tester or scan tool to verify communication with ECM. If no communication, check power and grounds to the ECM. If possible, read the freeze frame data. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

 
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