Quick tech question

[toomanytoys]

How do you test a egr switching solenoid? I’m getting a code po401 ( exhaust gas recirculation flow insufficient) on my 03 Sable dohc. The egr valve itself is fine and functions properly under vacuum. I’m wondering how to check the solenoid

 

[Albatross]

I would apply 12 volts and ground to the pins. If you hear it click its probably functioning. You could also apply vaccum to one of the ports before applying 12 volts and see if it holds. Then apply the voltage to the pins while holding vaccum and if it releases vacuum its letting air through which also indicates it is working.

 

[hotcobra03]

Was just reading pinpoint tests.

po401. With ESM
Or with out.

With esm


HH19 CHECK EVR SOLENOID VACUUM

• Reconnect the ESM.
  
  
• Disconnect EVR vacuum source hose.
  
  
• Connect a vacuum gauge to the EVR vacuum source hose.
  
  
• Key on, engine running.
  
  
• Observe the vacuum gauge.
  

Is the manifold vacuum greater than 34 kPa (10 in-Hg)?

 

[hotcobra03]

Without esm

HE91 INSPECT D.P.F. EGR SENSOR PRESSURE HOSES

• Visually inspect both pressure hoses for reversed connection at D.P.F. EGR sensor or at orifice tube assembly.
  
  
• Inspect both hoses for improper routing. Hoses should not be pinched or have dips where water could settle or freeze.
  
  
• Inspect both hoses for leaks and blockage.
  
  
• Inspect D.P.F. EGR sensor and orifice tube assembly for blockage or damage at the pickup tubes.
  

Is a fault detected?