2001 S40 Idle Air Control Valve (no power from wires)

ddred · Post by **ddred** » 01 Aug 2011, 06:05

I havae a 2001 S40 and it recently shut off. I got the P050 code for IACV system, checked and cleand it. The IAC valve works when I checked it from the battery, but does not work from the wire from the leads. I checked the leads and got not nothing. The car still idle with the bypass,,, but the valve does not work because of no power from the leads. Is there a fuse or relay or a way for me to check the lead? thanks

Post by **jimmy57** » 01 Aug 2011, 10:06

The PTC heater on air inlet hose has likely shorted and blown a fuse for it and idle valve, check the fuses in under hood box.

ddred · Post by **ddred** » 10 Aug 2011, 07:23

Thanks Jimmy, it was a fuse in the engine bay. it was the ecu sensor fuse (10A)

Post by **zulu-v40** » 12 Aug 2011, 17:06

Just curious, did you replace the Idle Control Valve gasket after cleaning? I've ordered and received a replacement gasket. When I cleaned the valve, the gasket appeared to be affixed to the valve w/ some sort of adhesive. What kind of adhesive would be appropriate to use?

Post by **zulu-v40** » 13 Aug 2011, 08:12

VADIS has this to offer:

Installing idle air control (IAC) valve:
Always use a new gasket.
-Locate the new gasket with the tab pointing down and to the right
-Secure IAC valve. Tightening torque 10 Nm
-Reconnect Connector
-Check function
-Install throttle cable cover
Start engine. Read any diagnostic trouble codes (DTCs).

So, nothing about using adhesive. I've read elsewhere that adhesive is not to be used for this type of gasket, but would still like to confirm with the folks on this forum.

dsj1000 · Post by **dsj1000** » 21 Aug 2018, 06:00

I too have the same "no voltage going to the idle control valve (ICV)". The ICV tests good at 13 ohms. I am searching for the PTC heater. Where is this item located? Also, which fuse would control this?

Thanks for your help!

Post by **RickHaleParker** » 21 Aug 2018, 07:06

dsj1000: Your questions were answered before you ask them. Read the whole conversation.

dsj1000 · Post by **dsj1000** » 21 Aug 2018, 13:30

I must have missed something as I do not know where the PTC heater is inside the engine compartment; guess I need a diagram of components so that I can locate this specific part.

Also, I understand that maybe the reason for no voltage is a blown fuse, but I am thinking that there may be something else wrong.

Thanks for your assistance.

Don

dsj1000 · Post by **dsj1000** » 21 Aug 2018, 13:37

I am trying to understand the operation of idle control valve (ICV): I read in another post that - with the ignition switch in the "ON" position (engine not started) there should be 12 volts at the two terminals in the wiring connector that connects to the ICV, assuming the fuse is not blown as mentioned above. Is this correct? If so, what "could" interrupt the voltage at this connector?

Thanks.

Don

Post by **RickHaleParker** » 21 Aug 2018, 14:07

dsj1000 wrote: ↑21 Aug 2018, 13:30 I must have missed something as I do not know where the PTC heater is inside the engine compartment; guess I need a diagram of components so that I can locate this specific part.

jimmy57 wrote: ↑01 Aug 2011, 10:06 The PTC heater on air inlet hose has likely shorted and blown a fuse for it and idle valve, check the fuses in under hood box.

ddred wrote: ↑10 Aug 2011, 07:23 Thanks Jimmy, it was a fuse in the engine bay. it was the ecu sensor fuse (10A)