626 1999-2001

Exhaust Gas Recirculation System

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EGR Solenoid



Operation

Specific to:

Mazda 626 1998-2002

The EGR boost solenoid valve switches the application of barometric pressure or intake manifold vacuum to the EGR boost sensor. Intake manifold vacuum is applied to the EGR boost sensor when the solenoid is energized.

Removal & Installation

Specific to:

Mazda 626 1998-2002


NOTE
Manufacturer does not provide a specific removal and installation procedure for this component. Use the illustration as a guide when servicing this component.

Testing

Specific to:

Mazda 626 1998-2002



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

EGR Valve



Operation

Specific to:

Mazda 626 1998-2002

The Exhaust Gas Recirculation (EGR) system controls the oxides of nitrogen (NOx) emissions. Small amounts of exhaust gases are recirculated to the combustion chamber. The combustion chamber temperature is reduced and NOx emissions are lowered.

The EGR control is enabled when the vehicle is running after warm up. The EGR control is cancelled when any of the following conditions are met:



Engine is idling.
 
During engine warm-up.
 
Vehicle speed is below 3 km/h 2 mph.
 
Engine speed is below 1,000 rpm.
 
Torque reduction control is activated. KL engine only
 
Malfunction of ECT sensor, TP sensor, MAF sensor or EGR valve.
 

EGR Boost Sensor

Specific to:

Mazda 626 1998-2002

The EGR boost sensor converts the intake manifold pressure and barometric pressure into a voltage value, and sends the voltage signal to the PCM. The pressure application is changed by the EGR boost sensor solenoid valve. The voltage value is used only for the EGR and EVAP system monitoring.

EGR Boost Solenoid Valve

Specific to:

Mazda 626 1998-2002

The EGR boost solenoid valve switches the application of barometric pressure or intake manifold vacuum to the EGR boost sensor. Intake manifold vacuum is applied to the EGR boost sensor when the solenoid is energized.

EGR Valve

Specific to:

Mazda 626 1998-2002

The EGR valve is a stepping motor type. The PCM controls the EGR valve to increases or decreases the EGR amount. On 2.5L V6 engine, engine coolant flows through the EGR valve to cool it and improve reliability.

Removal & Installation
2.0L 4-Cylinder Engine

Specific to:

Mazda 626 1998-2002

  1. Disconnect the EGR valve electrical connector.
  2.  
  3. Remove the mounting bolts and remove the EGR valve.
  4.  
  5. Installation is the reverse of the removal procedure.
  6.  
  7. Tighten the mounting bolts to 14-18 ft. lbs. (19-25 Nm).

    Click image to see an enlarged view

    Fig. Removing the EGR valve-2.0L 4-cylinder engine

  8.  

2.5L V6 Engine

Specific to:

Mazda 626 1998-2002

  1. Disconnect the EGR valve electrical connector.
  2.  
  3. Remove the engine coolant hose.
  4.  
  5. Remove the EGR pipe.
  6.  
  7. Remove the mounting bolts and the EGR valve.
  8.  
  9. Installation is the reverse of the removal procedure.
  10.  
  11. Tighten the mounting bolt to 4-18 ft. lbs. (19-25 Nm).

    Click image to see an enlarged view

    Fig. Removing the EGR valve-2.5L V6 engine

  12.  

Testing

Specific to:

Mazda 626 1998-2002



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

 
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