I got a P0505 error when diagnosing my car. I've been told the IAC needs cleaned or replaced. But where is it??
The IAC is on the bottom of the throttle body and has a hole in the bottom of the throttle body that lets air into the IAC. YOu do not have to remove it, if you do remove it the throttle body would have to come off and a new gasket would be required. Usually spraying through with throttle body cleaner will clean the IAC so it functions properly.
About your P0505 faut code, The IAC (Idle Air Control) valve controls the idle speed of the engine. At idle the throttle plate is closed, of course. The IAC is computer controlled and allows only a certain amount of air around the throttle plate. This metered air controls the idle speed. The IAC has a "plunger" or "shutter" that moves to open or close the bypass air passageway. The more air the IAC allows around the throttle plate, the higher the idle. The PCM (Powertrain Control Module) uses the IAC valve to keep the idle speed correct with varying engine demands. Can be a three or four wire sensor depending on the model.
The PCM monitors voltages of the IAC circuits and if it detects an incorrect voltage on one or more of the IAC motor circuits it will set P0505. NOTE: Problems with the IAC would only be noticeable at idle or when throttle is closed.
Symptoms may include:MIL (Malfunction Indicator Lamp) illuminationEngine stalls and may not idle unless throttle is depressedIntermittently stalls when letting off the throttleEngine may idle too high
Potential causes of an P0505 code include:IAC motor connector is damaged (check connector and pins for damage, and moisture)One or more IAC circuits open or shorted to groundOne or more IAC circuits are shorted to voltageIAC has failedPCM has failed
Possible Solutions:This should be a fairly straightforward diagnosis. Start by clearing the fault codes. Then unplug the IAC and start the engine (This may cause other IAC codes to set. Just ignore them for now). If the P0505 code doesn't reset, replace the IAC. It is internally shorting one of the IAC circuits. If the code DOES return after unplugging the IAC and starting the engine, then you know it isn't the IAC motor. Visually check the wiring harness all the way back to the PCM. You may need to visually inspect the harness by removing all the insulation off the wires. It is possible that the wires could be shorting to eachother or to other wires in the harness.
If there are no wiring problems, and the code keeps returning with the IAC unplugged, you can check the PCM by removing the IAC wires from the PCM connector (or clipping the wires in a location where they can be repaired easily) and then start the engine (If you're not sure, don't do it. Take it to a qualified professional). Now if the code doesn't reset there is a problem with the wiring. Check for continuity on all the IAC wires. Any resistance points to a problem. Check for voltage on any(At this point there shouldn't be any voltages on the wires because they're clipped at one end and unplugged at the IAC). Repair as necessary. But if the P0505 code DOES reset after removing the IAC wires from the PCM connector(or clipping them), replace the PCM, there's a problem internally on the IAC control circuit.
Hope this helps.
SOURCE: 1993 Toyota Camry IAC cleaning
1) remove the black intake hose from the throttle body
2) get a can of throttle body/intake cleaner
3) be VERY careful if you decide to use the straw included with the can of cleaner, it can detach and go inside of your intake manifold.
4) spray inside and use a rag to remove junk from throttle plate(front and back side), hold the straw on the cleaner can and spray into the hole just ahead of the throttle plate, let soak for 10 minutes or so
5) reattach intake hose and start engine - you may get black smoke/rough idle for a minute as junk exits the engine
SOURCE: 2002 toyota echo
Either the sensor on the air filter needs to be cleaned. Easy. I've done it myself. Or one of the sensors, before and after the catalytic converter, needs to be changed. difficult.
SOURCE: Remove and clean Toyota Echo heater fan.
The fan is under the pass dash, remove the glove box and you should see it, 1 plug and 3 8 mm screws.
Testimonial: "Thank you very much."
SOURCE: how to remove toyota echo car stereo system
remove stereo suround which is held in with some stubbin clips then its quiet easy from there
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