Description
OBD-II Trouble Code Description for P0111 Citroen
IAT Circuit Malfunction
What does this mean?
OBD2 Code P0111 Citroen definition:
The IAT (Intake Air Temperature) sensor is a thermistor that varies resistance based upon the temperature of the engine intake air. Usually a two wire sensor. One wire is supplied 5 Volt from the PCM (Powertrain Control Module) and the other is a ground. The PCM monitors the change in the 5 Volt supplied to determine air temperature. When the intake air is cold, the resistance is high, resulting in a high signal voltage. When the intake air is warm, the reistance is low, resulting in a low signal voltage. This code means that the PCM saw a larger-than-normal change in a shorter-than-expected time on the IAT signal circuit.
Symptoms
Possible sumptoms of OBD code P0111 Citroen
Since this code is likely pointing to an intermittent problem on the IAT circuit, there may not be any symptoms at present. However, the MIL will likely be on. The car MAY exhibit some drivability problems, but it is more likely that there will be no noticeable symptoms to the driver.
Causes
Possible causes of OBD code P0111 Citroen
a bad IAT sensor an open in the signal or ground circuit a short to ground on the signal circuit poor connection at sensor or PCM
Possible Solutions
If there are other IAT codes present, diagnose them first. If not, then, using a scan tool verify the IAT voltage with KOEO (Key on engine off). If, on a cold engine it reads the same as the CTS (Coolant temperature sensor), then the problem is intermittent. But if the IAT reading isn’t the same as the CTS refer to diagnostic procedure for P0110 Citroen. If your scan tool has a freeze frame failure records feature, use it to see what the IAT reading was at the time of the failure. If the reading was at negative 30 or so degrees F (indicating it was at the extreme coldest reading), then there was an intermittent high resistance reading on the IAT signal circuit. Check for an open ground on the ground circuit and signal circuit. If they are OK, try raising and lowering the temperature of the IAT sensor artificially. Do this by removing the IAT and putting it in a freezer and then applying heat with a heat gun (be careful not to apply too much heat to the IAT with the heat gun or it’ll melt the sensor). Watch the resistance change using an ohmmeter attached to each terminal. It should vary smoothly with no sudden jumps. If the reading jumps suddenly, then repace the IAT sensor. However if the freeze frame reading was at the highest extreme (above 250 deg. F) then there was an intermittent low resistance on the signal circuit. Check for a short to ground on the signal circuit. If it appears OK, then do the above artificial heat test and replace the IAT as necessary. If the problem can’t be duplicated, use a voltmeter to watch the signal voltage as you “wiggle” test the wiring harness. Watch for a sudden change in voltage indicating a short or open. Replace IAT as necessary. This is a pretty simple code and it only really looks for extremely short changes that are relatively high in voltage. It’s usually the sensor that is bad unless the vehicle is extremely old, in which case there may be harness problems.
The OBD2 Code Information Be Applicable For Citroen :
2013 Citroen Technospace Concept,2013 Citroen DS Wild Rubis Concept,2013 Citroen DS3 Cabrio Racing Concept,2013 Citroen Cactus Concept,2013 Citroen C4 L,2013 Citroen C4 Aircross,2013 Citroen C3 Picasso,2013 Citroen C1,2013 Citroen C-Elysee,2012 Citroen Numero 9 Concept,2012 Citroen DS5,2012 Citroen DS4 Racing Concept,2012 Citroen DS4,2011 Citroen Tubik Concept,2011 Citroen DS3 Racing,2011 Citroen DS3 R3,2011 Citroen DS3,2011 Citroen C5,2011 Citroen C4,2011 Citroen C-Zero,2010 Citroen Survolt Concept,2010 Citroen Metropolis Concept,2010 Citroen Lacoste Concept,2010 Citroen GQ Concept,2010 Citroen DS High Rider Concept,2010 Citroen C3,2009 Citroen REVOLTe Concept,2009 Citroen DS Inside Concept,2009 Citroen C4 Coupe,2009 Citroen C4,2009 Citroen C3 Pluriel Charleston,2009 Citroen C3 Picasso,2009 Citroen C2,2009 Citroen C1,2009 Citroen Berlingo Multispace,2008 Citroen Hypnos Concept,2008 Citroen GT Concept,2008 Citroen C5 Estate,2008 Citroen C5,2008 Citroen C4 notchback,2008 Citroen C4 WRC HYmotion4 Concept,2008 Citroen C4 Sedan,2007 Citroen Grand C4 Picasso,2007 Citroen Cruise Crosser Concept,2007 Citroen C5 Airscape Concept,2007 Citroen C4 Picasso,2007 Citroen C-Crosser,2007 Citroen C-Cactus Concept,2006 Citroen C6,2006 Citroen C3 X-TR,2006 Citroen C3 VTR,2006 Citroen C3 Pluriel,2006 Citroen C3,2006 Citroen C1 5door,2006 Citroen C1 3door,2006 Citroen C-Metisse Concept,2006 Citroen C-Buggy Concept,2005 Citroen C5 Break,2005 Citroen C5,2005 Citroen C4 Coupe with Panoramic Sunroof,2005 Citroen C4 Coupe Enterprise,2005 Citroen C4 Coupe,2005 Citroen C4,2005 Citroen C-SportLounge Concept Car,2005 Citroen C-Airplay Concept,2004 Citroen Xsara Picasso,2004 Citroen C4 Sport Concept,2004 Citroen C3 Pluriel HDi 70,2004 Citroen C2,2003 Citroen CAirlounge Concept,2003 Citroen C8 Exclusive,2002 Citroen C-Airdream Concept,2001 Citroen Xsara Picasso,2001 Citroen C-Crosser Concept
Note:
1. The list of automotive Makes at the right edge of the screen. The currently selected ODB-ii codes is for the Citroen makes.
2. Look up the other OBD II Trouble Codes, please use the search box. Enter the 5 character trouble codes in the search box and submit the search.
3. Don’t assume a particular OBD-II code means the same for other auto manufacturers as there are many makes specific codes in use.
4. If your OBD-II trouble codes are for a different car, select that vehicle series before searching for the diagnostic codes because not all OBD2 codes used by one manufacture are used by the other makes.
5. The information contained on this site is presented for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any doubt as to repairs on your vehicle, please contact your technician.