PO 505: Idle Control System Malfunction. - Nissan Forum
B14 95-99 chassis 1995-1999 Sentra and 1995-1998 200SX

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#1 Old Dec 3rd, 2003, 03:51 PM
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Question PO 505: Idle Control System Malfunction.


My Sentra GXE (96 make) threw up a 'Check Engine' dashboard warning symbol suddenly. The diagnostic says 'PO 505: Idle Control System Malfunction'. One kind soul told me it is the 'Idle Air Control Valve' which needs to be repaired/ replaced. Any idea/ suggestions? Would appreciate your help.

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#2 Old Dec 3rd, 2003, 04:17 PM
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the exact same thing happened to me. you will probably have to replace the valve. it shouldnt cost more than $200 dollars. im sure the valve has gone bad, as this has happened with many people with 1995-1998 sentras, particularly the ones built in mexico. most nissan dealers should have the part.
#3 Old Dec 3rd, 2003, 04:33 PM
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The same problem has come up on alot of cars but I haven't seen alot of people replace them. Try cleaning with TB cleaaner first, then replace. Awfully expensive part to find out that wasn't it.

too poor to enjoy.....
#4 Old Dec 4th, 2003, 01:13 PM
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Thanks for your replies. It was quite an eye-opener. What is the TB Cleaner and how do I clean the valve with this? I fully agree the valve cld be too expensive.. Wld the engine or any system get damaged for a faulty valve?
#5 Old Dec 4th, 2003, 01:37 PM
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The engine wouldn't be damaged by this particular valve, it would just cause the car to run poorly. It usually shows up as a lumpy idle. Odd that it throws a code and the car isn't running funny. TB stands for Throttle Body and you can get the cleaner at most auto stores. I just removed the valve, sprayed it with the cleaner, and wiped it down with Q-tips very gently. This turned out to not be my problem so I don't know what a malfunctioning valve would act like.

too poor to enjoy.....

  Nissan Forum > Sentra, Pulsar, NX, B14 200SX > B14 95-99 chassis

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