Difference between revisions of "16785/P0401/001025"

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== 16785/P0401 - Exhaust Gas Recirculation Flow Insufficient Detected ==
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== 16785/P0401/001025 - Exhaust Gas Recirculation (EGR) System: Insufficient Flow Detected ==
  
 
==== Possible Symptoms ====
 
==== Possible Symptoms ====
  
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* Drivebility problems (check dtc's with Knock Sensor)
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* Malfunction Indicator Light (MIL) ON
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* Irregular behaviour
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* Reduced Exhaust Gas Recirculation (EGR)
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* Reduced Power Output/Engine running rough
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* Increased Emissions
  
 
==== Possible Causes ====
 
==== Possible Causes ====
  
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* EGR valve stuck closed
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* Exhaust Gas Recirculation (EGR) Flow restricted/clogged
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* EGR valve leaks vacuum
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* Exhaust Gas Recirculation (EGR) Valve stuck closed/leaking/faulty
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* EGR flow restricted
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* Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve faulty
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* Circuit EGR short to B+
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* Exhaust Gas Recirculation (EGR) System faulty
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* EGR damaged
 
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* Circuit DPF EGR sensor (differential pressure) disconnected, short to B+ or Ground
 
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* DPF EGR sensor downstream hose off or plugded
 
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* DPF EGR sensor damaged, wrong attached
 
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* Control Module damaged
 
  
 
==== Possible Solutions ====
 
==== Possible Solutions ====
  
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* Check all wiring and connections to and from EGR and DPF-EGR
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* Check/Clean Exhaust Gas Recirculation (EGR) System
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* Check the EGR: use a vacuumpump and pull open the EGR: rpm should change
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* Check/Replace Exhaust Gas Recirculation (EGR) Valve
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* Clean the EGR
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* Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve
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* Check / Replace EGR
 
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* Check / Replace DPF-EGR
 
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==== Special Notes ====
 
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* The EGR system is monitored when driving at steady state and the EGR is commanded on. When the DPF-EGR sensor indicates that EGR flow is less then a desired minimum a dtc is set.
 
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* N.B. mechanics with less knowledge do exchange the EGR often, but 75% sure the problem will be back (probably the DPF-EGR sensor causes the problem).
 
  
 
[[Category:Fault Codes]]
 
[[Category:Fault Codes]]

Revision as of 08:20, 6 April 2009

16785/P0401/001025 - Exhaust Gas Recirculation (EGR) System: Insufficient Flow Detected

Possible Symptoms

  • Malfunction Indicator Light (MIL) ON
  • Reduced Exhaust Gas Recirculation (EGR)
  • Reduced Power Output/Engine running rough
  • Increased Emissions

Possible Causes

  • Exhaust Gas Recirculation (EGR) Flow restricted/clogged
  • Exhaust Gas Recirculation (EGR) Valve stuck closed/leaking/faulty
  • Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve faulty
  • Exhaust Gas Recirculation (EGR) System faulty

Possible Solutions

  • Check/Clean Exhaust Gas Recirculation (EGR) System
  • Check/Replace Exhaust Gas Recirculation (EGR) Valve
  • Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve
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