Difference between revisions of "18613/P2181/008577"

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== 18613/P2181/008577 - Performance Malfunction in Cooling System ==
 
== 18613/P2181/008577 - Performance Malfunction in Cooling System ==
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==== Possible Symptoms ====
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* Malfunction Indicator Light (MIL) ON
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* Reduced Heater Output - Cold toes
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* Incorrect Temperature Gauge Readings
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* Increased Emissions
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==== Possible Causes ====
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* Faulty Coolant Sensor
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* Faulty Coolant Thermostat
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* Faulty Wiring, Connections
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''Note'': This fault code sets when engine coolant temperature mapping is lower and out of expected range based on operating conditions of the engine.
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* For example: Engine warms up, thermostat opens and stays open, coolant temperature drops below normal operating range. The ECM knows the coolant temperature should stay within 80.0...110.0 °C typically after warm up. Thus a drop in coolant temperature below normal operating temperature is not possible without a '''Malfunction in Cooling System'''.
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==== Possible Solutions ====
 
==== Possible Solutions ====
  
* Check Engine Coolant Temperature Sender (G62)<br>
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* Check G62 - Engine Coolant Temperature Sender <br>
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** Inspect wiring for G62 (Coolant Migration, damage, corrosion, etc)
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* Check (if applicable) G83 - Radiator Outlet, Coolant Temperature Sender <br>
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** Inspect wiring for G83 (Coolant Migration, damage, corrosion, etc)
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* Check Coolant Thermostat
 
* Check Coolant Thermostat
* Check Engine Cooling System
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**  Use Graph function in VCDS, Measuring Value Blocks - MVB
** Put the key on, fan speed on 1, and push the a/c switch. Are both fans kicking on? If not, you found the problem.
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** Start Engine cold, graph Coolant Temperature Sender (G62) Typically MVB Group-001
** Put the key on and fan speed on 1 with temperature set to hot. Does heat come out readily from the vents?
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** Hold RPM around 1,500rpm and watch coolant temp increase in Graph until thermostat opens, indicated by a slight drop in coolant temp
*** No. Probably the water pump is gone.
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** If coolant temp drops below minimum operating temperature (80°C) or never reaches operating temperature, (verified by external thermometer) suspect failed thermostat
*** Yes. Probably the thermostat is gone.
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* Vehicles with both G62-Engine Outlet, Coolant Temperature Sensor and G83-Radiator Outlet, Coolant Temperature Sensor
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** Use Measuring Value Block group MVB-130 instead on MVB-001
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** G62 should increase in Temperature before G83 increase when engine coolant is cold
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** G83 will increase when the thermostat opens and after G62 reaches operating temperature (80°C)
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** If G62 and G83 both increase while engine warms up, suspect failed thermostat
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==== Special Notes ====
 
==== Special Notes ====
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** Freeze Frame data stored at -40*C is generally an indication of a faulty ECT or wiring.
 
** Freeze Frame data stored at -40*C is generally an indication of a faulty ECT or wiring.
 
** Freeze Frame data stored at +140*C is generally an indication of a faulty ECT or wiring.
 
** Freeze Frame data stored at +140*C is generally an indication of a faulty ECT or wiring.
** Freeze Frame data stored with in the 68* ~ 80* range is an indication that the vehicle was close to, but not within, the cooling systems normal operation range. The Thermostat itself or Cooling system components may be at fault.
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** Freeze Frame data stored with in the 68*C ~ 80*C range is an indication that the vehicle was close to, but not within, the cooling systems normal operation range. The Thermostat itself or Cooling system components may be at fault.
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[[Category:Fault Codes]]
 
[[Category:Fault Codes]]

Latest revision as of 11:55, 24 October 2013

18613/P2181/008577 - Performance Malfunction in Cooling System

Possible Symptoms

  • Malfunction Indicator Light (MIL) ON
  • Reduced Heater Output - Cold toes
  • Incorrect Temperature Gauge Readings
  • Increased Emissions


Possible Causes

  • Faulty Coolant Sensor
  • Faulty Coolant Thermostat
  • Faulty Wiring, Connections

Note: This fault code sets when engine coolant temperature mapping is lower and out of expected range based on operating conditions of the engine.

  • For example: Engine warms up, thermostat opens and stays open, coolant temperature drops below normal operating range. The ECM knows the coolant temperature should stay within 80.0...110.0 °C typically after warm up. Thus a drop in coolant temperature below normal operating temperature is not possible without a Malfunction in Cooling System.


Possible Solutions

  • Check G62 - Engine Coolant Temperature Sender
    • Inspect wiring for G62 (Coolant Migration, damage, corrosion, etc)
  • Check (if applicable) G83 - Radiator Outlet, Coolant Temperature Sender
    • Inspect wiring for G83 (Coolant Migration, damage, corrosion, etc)
  • Check Coolant Thermostat
    • Use Graph function in VCDS, Measuring Value Blocks - MVB
    • Start Engine cold, graph Coolant Temperature Sender (G62) Typically MVB Group-001
    • Hold RPM around 1,500rpm and watch coolant temp increase in Graph until thermostat opens, indicated by a slight drop in coolant temp
    • If coolant temp drops below minimum operating temperature (80°C) or never reaches operating temperature, (verified by external thermometer) suspect failed thermostat
  • Vehicles with both G62-Engine Outlet, Coolant Temperature Sensor and G83-Radiator Outlet, Coolant Temperature Sensor
    • Use Measuring Value Block group MVB-130 instead on MVB-001
    • G62 should increase in Temperature before G83 increase when engine coolant is cold
    • G83 will increase when the thermostat opens and after G62 reaches operating temperature (80°C)
    • If G62 and G83 both increase while engine warms up, suspect failed thermostat


Special Notes

  • Check the stored Freeze Frame data with this fault code. Freeze Frame information will be found in the fault code description (if the module supports it) or in Generic OBD-II if the vehicle complies with those regulations.
    • Freeze Frame data stored at -40*C is generally an indication of a faulty ECT or wiring.
    • Freeze Frame data stored at +140*C is generally an indication of a faulty ECT or wiring.
    • Freeze Frame data stored with in the 68*C ~ 80*C range is an indication that the vehicle was close to, but not within, the cooling systems normal operation range. The Thermostat itself or Cooling system components may be at fault.