16785/P0401/001025: Difference between revisions

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


==== Possible Symptoms ====
==== Possible Symptoms ====


* Drivebility problems (check dtc's with Knock Sensor)
* Malfunction Indicator Light (MIL) ON
* Irregular behaviour
* Reduced Exhaust Gas Recirculation (EGR)
* Reduced Power Output/Engine running rough
* Increased Emissions


==== Possible Causes ====
==== Possible Causes ====


* EGR valve stuck closed
* Exhaust Gas Recirculation (EGR) Flow restricted/clogged
* EGR valve leaks vacuum
* Exhaust Gas Recirculation (EGR) Valve stuck closed/leaking/faulty
* EGR flow restricted
* Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve faulty
* Circuit EGR short to B+
* Exhaust Gas Recirculation (EGR) System faulty
* EGR damaged
* Circuit DPF EGR sensor (differential pressure) disconnected, short to B+ or Ground
* DPF EGR sensor downstream hose off or plugded
* DPF EGR sensor damaged, wrong attached
* Control Module damaged


==== Possible Solutions ====
==== Possible Solutions ====


* Check all wiring and connections to and from EGR and DPF-EGR
* Check/Clean Exhaust Gas Recirculation (EGR) System
* Check the EGR: use a vacuumpump and pull open the EGR: rpm should change
* Check/Replace Exhaust Gas Recirculation (EGR) Valve
* Clean the EGR
* Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve
* Check / Replace EGR
* Check / Replace DPF-EGR
 
==== Special Notes ====
 
* 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.
* 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 13:20, 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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