Idle air control Valve

Tiny
JLANZAS09
  • MEMBER
  • 2001 VOLVO S40
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
Car would not start in the morning- it would only start by pressing the accelerator for about 2 minutes or else it would die out.

check engine light came out. Took the car to a autozone to get the code read. Code P0507
IAC Valve. IAC Valve replace but the check engine light is still on. Do I need to reset it and how.
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Wednesday, February 23rd, 2011 AT 1:33 AM

4 Replies

Tiny
JIS001
  • EXPERT
Yes you would need to reset the light. Usually it is done with the scanner but if you do not have one, remove the fuse for the ECM or disconnect the battery ground cable and leave it disconnected for a couple of minutes.
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Wednesday, February 23rd, 2011 AT 1:51 AM
Tiny
JLANZAS09
  • MEMBER
I disconnected the negative terminal on the battery for 5 minutes
and the check engine light is still on. Do I need more time. What do you suggest.
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Wednesday, February 23rd, 2011 AT 3:06 AM
Tiny
JLANZAS09
  • MEMBER
Hello, I follow the instruction above I disconnected the battery all night long, check engine still on, I took it to autozone and reset it with the scanner. It went off for a few minutes than it came back on. I took the ecm fuse out and put it back and the check engine light is still on. Please advised. Thank you.
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Thursday, February 24th, 2011 AT 2:15 AM
Tiny
JIS001
  • EXPERT
If the light will not go out then that means you have a hard fault and proper diagnosis needs to be done. You could have a faulty throttle position sensor, blocked hoses, intake leaks? Whenever you scan a fault code, the code should not be really taken at face value. The code only gives you an idea as to what component is affected and start with some basic checks as to what other components would have a related affect to it? Like say an oxygen sensor code for example. On your vehicle the exhaust nuts are prone to coming loose so unmetered oxygen enters through the exhaust leak causing the oxygen sensor to give a different reading then what the mass air flow sensor sees so you would get an oxygen sensor code fault but the root cause of the fault was an exhaust leak. Same thing with your IAC fault. Proper diagnosis needs to be done to find the root cause of the fault.
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Thursday, February 24th, 2011 AT 5:57 AM

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