1998 Honda Accord Icv Wire Diagram
My 2005 Honda Accord I4 is idling fine when cold but once warm it begins "revving" on its own between 1200-2000RPM at about 0.5Hz. The vehicle initially threw a DTC P0507 ("Idle Air Control System RPM Higher Than Expected") within a few minutes of starting but after disconnecting the battery (see troubleshooting below) I haven't been able to reproduce it. Symptoms: At cold start idle is a little higher than normal, 2000RPM (usually 1500?) When warm, and vehicle is in PARK, idle revs between 1200-2000RPM at about 0.5Hz. Holding the accelerator when vehicle is in PARK ceases revving, but then it begins again when accelerator is released. Placing vehicle in DRIVE ceases revving, but idle is higher than normal, 1200RPM (usually 700?) Interesting twist: If I disconnect the Throttle Position Sensor (TPS) while its revving the frequency of revving increases to about 1Hz.