How to test an iacv?

That code is for the idle speed control valve. Please follow the link P0505 Honda Idle Air Control Valve

P0505 IAC Malfunction

Trouble Code: P0128

Thermostat Range/Performance

Trouble Code Conditions: DTC P0107, P0108, P0112, P0113, P0116-118, P0335, P0336, P0300-P0306, P0401, P0505, P1106-P1108, P1259 and P1519, engine running at road load for 10 minutes, and the PCM detected the ECT sensor input did not reach the correct closed loop value. Note: It is possible for this code to set if the engine is left running while the hood is open for an extended period in a warm climate.

Possible Causes:


Inspect for low coolant level or for an incorrect coolant mixtureCheck the operation of the thermostat (it may be stuck open)TSB 01-064 (9/11/01) contains a repair procedure for this code

P0505 - Idle Control System Malfunctionhttp://engine-codes.com/p0505.htmlForum CodePossible causes- IACV-AAC valve harness is open or shorted
- IACV-AAC valve poor electrical connection
- Faulty IACV-AAC valve

Read more: http://engine-codes.com/p0505.html#ixzz1zVJIt34L

P0505 Idle Air Control System Malfunction That points to either an unplugged or bad Idle Air Control Valve (IACV).

P0505 Idle Control System Malfunction

IACV or Idle Air Control Valve if equipped is malfunctioning.

P0420 Catalyst System Efficiency Below Threshold (Bank #1)
The Catalytic converter is not working up to par in Bank#1.

I think this will point you in the right direction..

CODE P1519 CAMSHAFT TIMING RIGHT CYLINDER BANK SIGNAL RANGE PERFORMANCE. * CODE P1386 FUEL INJECTION CONTROL MODULE INTERNAL FAULT.

Look into the idle control solenoid.Either it doesnt have voltage or the solenoid is defective.

p0505 is a code for your IAC (idle air control valve) located right below the TPS (throttle positioning sensor). Beware it is not necessarily the sensor. If you use a test light on the connection coming to it while the vehicle is running and rev the motor each terminal (probably four) should flash. In this case it is most likely your sensor. If not it is in the wiring or your pcm.

check your high idle valve may need to be replaced.situated at the side of throttle body.

good luck
cyril