What does Engine code P1491 mean?
What does Engine code P1491 mean?
A position sensor indicates how far the valve has moved. In this instance, code P1491 will set when the PCM pulses the EGR solenoid at a set duty cycle for a specific percent lift but does not see it reach that set location or lift via the position sensor.
What does code p1491 mean on an engine?
What Does Code P1491 Mean? The Exhaust Gas Recirculation (EGR) system is used by the Powertrain Control Module (PCM) to recirculate exhaust gases back into the intake manifold of the engine in order to take up space where air and fuel would be.
What does Mil code p1491 mean on Honda Odyssey?
In some 1999–2003 Honda Odysseys and 2003 Honda Pilots, the EGR system may become contaminated or clogged. If this happens, the vehicle may hesitate or surge during light acceleration, and the MIL (malfunction indicator lamp)may come on with DTC P0401 (EGR insufficient flow) or P1491 (EGR valve insufficient lift).
Where is the EGR valve located on a p1491?
If the P1491 is the only active fault code present, and there are no updates/TSBs for your particular vehicle, then the next step is to locate the EGR Valve / Lift sensor / position sensor. You can usually find the EGR valve mounted between the intake and exhaust manifold of the engine.
How does the Honda p1491 exhaust gas recirculation system work?
P1491 Honda Description. The Exhaust Gas Recirculation (EGR) system reduces Oxides of Nitrogen (NOx). NOx is generated by high combustion temperatures. The EGR system lowers peak combustion temperature by recirculating inactive exhaust gas into the air/fuel mixture, thus reducing NOx emissions.
What Does Code P1491 Mean? The Exhaust Gas Recirculation (EGR) system is used by the Powertrain Control Module (PCM) to recirculate exhaust gases back into the intake manifold of the engine in order to take up space where air and fuel would be.
In some 1999–2003 Honda Odysseys and 2003 Honda Pilots, the EGR system may become contaminated or clogged. If this happens, the vehicle may hesitate or surge during light acceleration, and the MIL (malfunction indicator lamp)may come on with DTC P0401 (EGR insufficient flow) or P1491 (EGR valve insufficient lift).
When does the EGR solenoid set p1491?
When the PCM pulses the EGR solenoid on to a set location but does not see it reach that set location via the position sensor, code P1491 is set in memory. Code P1491 is a manufacturer specific code, mostly utilized by Honda, Acura and Isuzu.
P1491 Honda Description. The Exhaust Gas Recirculation (EGR) system reduces Oxides of Nitrogen (NOx). NOx is generated by high combustion temperatures. The EGR system lowers peak combustion temperature by recirculating inactive exhaust gas into the air/fuel mixture, thus reducing NOx emissions.
