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Regardless of its design and control system though, the primary purpose of the EGR valve on any internal combustion engine is to allow a certain percentage of the total exhaust stream to be mixed with the incoming air/fuel mixture.The object is to reduce combustion temperatures to below about 1 500C) to prevent, or reduce the formation of various oxides of nitrogen, which are the principal components in exhaust gas that forms smog.
SEVERE OCCURRENCES MAY CAUSE THE VEHICLE CONTROL MODULE (VCM) TO SET A P1404 DTC BECAUSE THE VCM PERCEIVES THAT THE EGR VALVE IS STUCK OPEN. USING THE TECH 2 SCAN TOOL, EXERCISE THE EGR VALVE, AND VERIFY THE [EGR] VALVE’S ACTUAL AND DESIRED POSITION TRACK. FOLLOWING STEPS 1, 2 AND 3 OF THE STRATEGY BASED DIAGNOSTICS, DETERMINE IF THE VEHICLE HAS AN ACTUAL EGR VALVE CONDITION.
However, the transition from the definition has NOT been smooth and/or uniform across all manufacturers, and it may still be encountered on older USDM applications and some European imports.
The General Motors TSB below that describes a potential cause of this code on some older GM applications with the definition is reproduced from official GM sources.
Other possible causes could include the following- In some cases, code P1404 may have no symptoms other than a stored trouble code and an illuminated warning light.
Other symptoms are mostly make and model specific, but note that the severity of one or more symptoms may vary greatly between applications.
Since many manufacturers use variations of the definition for this to indicate EGR valve control related issues, it is strongly recommended to always consult the manual for the application being worked on to determine the exact definition of code P1404 as it relates to that application.
In terms of operation, Linear Electronic EGR valves incorporate a position sensor that relays the position of the valve pintle to the PCM.
Exhaust Gas Recirculation Closed Position Performance (Buick, Cadillac, Chevrolet, GM, Pontiac, Saturn) IAT - B Circuit Malfunction (Citroen/Peugeot, Ford, Mercury, Lincoln, Oldsmobile) EGR Stuck Closed (Acura, Isuzu) EGR Position Sensor Rationality Closed (Chrysler/Dodge/Jeep) Exhaust gas recirculation (EGR) valve - range / performance problem (Opel) EGR Flow Basic Setting not carried out (Volkswagen/Audi/Volvo) SPECIAL NOTES: OBD II code with the definition “IAT [Intake Air Temperature] – B Circuit Malfunction / Exhaust Gas Recirculation Closed Position Performance” is mostly relevant to some General Motors (and a few European) products from the late 1990’s to the early / mid 2000’s, and is therefore no longer in common use by most manufacturers.
Starting in the mid-2000’s, the component of the definition was dropped, largely due to improved PCM programming, even though it still appears in many sources, including online lists of OBD II code definitions.
IF THERE IS A VALVE CONDITION, PERFORM THE APPROPRIATE REPAIR PROCEDURES. FINALLY, REFLASH THE VCM WITH THE NEW SOFTWARE AND CORRESPONDING CALIBRATIONS LISTED BELOW.
THESE NEW CALIBRATIONS ARE DESIGNED TO MAKE THE DTC LESS SUSCEPTIBLE TO NOISE.
However, the setting parameters of this code are not uniform across all applications.