It is used to lower the emission of NOx (Nitrogen Oxide) gases to the atmosphere by reducing the combustion process temperature.The EEC uses the 6 MPH value threshold to activate idle dashpot strategy and prevent engine stalls coming to a stop and tip in when shifting.
![]() Month Of Eec-Iv To Obdii Switch At Ford Code 29 LoggedHaving a code 29 logged in the system can cause engine stalls in configurations with a manual transmission. Since VSS input is used to activate the dashpot function, it is normal to have a higher idle when transmission is shifted to neutral and the vehicle is above the 6 MPH threshold value. This is NOT an idle control problem (as it is erroneously tagged). Tools Required: (in addition to the generic tools) Digital VOM or DMM Wiring diagrams for your year Mustang Vacuum diagram for your year Mustang Testing Procedure: 1. With the ignition ON and the engine OFF, measure the voltage between VREF and SIGRTN terminals of the EVP sensor harness connector. If the voltage is 4vdc-6vdc, the power circuits to the sensor are OK.goto 2.NOK.check VREF to battery ground.OK.SIGRTN wire needs to checked for open condition.NOK.goto 3. Reconnect the EVP sensor. With the ignition ON and the engine OFF, measure the voltage between EVP sensor terminals EVP and SIG RTN. If the voltage reading is between.25vdc -.67vdc the sensor is okay.goto 4.NOK.replace EVP sensor. Check VREF voltage at alternate sensor (TPS or BP), sensor disconnected, Ign On, voltage should be between 4vdc-6vdc.OK.trace EVP VREF wire for open condition in harness.NOK.rerun KOEO and confirm failure code presence of sensor used for this test. Ign Off, ECM and EVP sensor disconnected, check continuity of the EVP signal wire pin from the sensor connector to pin 27 at the ECM connector, resistance reading should be lessequal to 5 ohms.NOK.trace EVP signal wire for an open condition and repair.OK.bad ECM. Code 33 means the EVP sensor output voltage did not change when ECM expected EVP to register valve opening via an EVP signal voltage increase. Check connection and condition of vacuum line from EGR Valve Regulator (EVR) to EGR valve, repairreplace if necessary. Further testing for code 33 is explained in the EVR Code 84 Troubleshooting thread. Month Of Eec-Iv To Obdii Switch At Ford Install Jumper WireQuick Tips for Specific Codes: Code 31: Disconnect EVP sensor and install jumper wire between the EVP and VREF terminals. KOEO. Code 31 should not show as an OD type code and should be replaced by code 34 andor 35. Code 34 and or 35: Disconnect EVP sensor. KOEO. Code 3435 should not show as an OD type code and should be replaced by code 31. A mind is like a parachute it only works when it is open. If you cant explain it simply, you dont understand it well enough. Tamil yuvan shankar raja 51 mp3 masstamilanAlbert Einstein) Tuning on a Dyno for the track, is like swim practice in a bathtub. I can explain it for you, but I cant understand it for you. The proof of understanding is the ability to explain it. H. Torruella) Ignorance is bliss, but stupidity is orgasmic. Truth invites it. Samuel Johnson) The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. Crowds are reactionary and barbaric. Jason) The person who says it cannot be done should not interrupt the person doing it.
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