I'acontrol m working on a 2002 nissan altima.

replace the IAC sensor , then use a scanner to reset the ECM

code p 0507 refers to idle speed (ISC) system-rpm higher expected ===causes ---wiring---ISC actuator --IAC valve--throttle motor ---throttle valve tight /sticking---ECM
it also refers to idle air control (IAC) system --circuit low ===causes ---wiring short to ground ---IAC valve --ECM
I would be wary of getting the throttle control actuator as all of the other possible causes indicate that it may not be that that is faulty

A vacuum leak Leaking air intake after the throttle body EGR valve leaking vacuum A faulty positive crankcase ventilation (PCV) valve Damaged/failed/dirty throttle body Failed EVAP system Failed IAC (idle air controller) or faulty IAC circuit

code p0507 refers to idle sped control (ISC) system--rpm higher than expected==causes --wiring--isc actuator--iac valve--throttle motor--throtle valve tight/sticking--ECM
it also refers to idle air control (IAC) system --circuit low==causes--wiring short to ground--IAC valve--ECM

Heater core may be clogged. Try flushing it to see if water flows through freely. Also check the heater water control valve for restrictions.

Check this link out and the causes of your P0507 code. P0507 OBD II Trouble Code Idle Control System RPM Higher Than Expected...

idle controll system idle to high is the code description

replace tps (throttle posistion sensor) some call it idle speed control module either way it needs to be replace. its located on or near the throttle body.

No....the rpms differ from engine to engine and from manufacturer to manufacturer. RPM's are always higher at higher speeds.

The RPM's should go up with speed and then level out once you mantain a speed.