code
1st Gear Member
Joined: Aug 2009
Posts: 55
From: Florida
Exerpt form obdcodes.com (just Google it!):
"Idle Air Control (IAC) System RPM Lower Than Expected
What does that mean?This P0506 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.
...Most likely the only thing you'll notice is the idle speed is lower than normal so it will likely be rougher. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.
CausesA P0506 DTC trouble code may be caused by one or more of the following:
A vacuum leak
An air restriction in the intake air path or exhuast
A faulty positive crankcase ventilation (PCV) valve
Damaged/failed/dirty throttle body
Internal engine problem
Failed PCM
Possible SolutionsThis DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns."
My thoughts:
I would suggest resetting the computer (loosen/remove positive battery cable, depress brakes for 10 seconds, reconnect, and tighten), checking that your throttle body (front of the intake) butterflies are clean...heck, spray them with some carb cleaner while you're looking (since we suck in oil mist from the valve cover), carb-clean the MAF sensor (on the intake tube), and try again. Mine did this once and it was just dirty butterflies on the TB.
"Idle Air Control (IAC) System RPM Lower Than Expected
What does that mean?This P0506 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.
...Most likely the only thing you'll notice is the idle speed is lower than normal so it will likely be rougher. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.
CausesA P0506 DTC trouble code may be caused by one or more of the following:
A vacuum leak
An air restriction in the intake air path or exhuast
A faulty positive crankcase ventilation (PCV) valve
Damaged/failed/dirty throttle body
Internal engine problem
Failed PCM
Possible SolutionsThis DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns."
My thoughts:
I would suggest resetting the computer (loosen/remove positive battery cable, depress brakes for 10 seconds, reconnect, and tighten), checking that your throttle body (front of the intake) butterflies are clean...heck, spray them with some carb cleaner while you're looking (since we suck in oil mist from the valve cover), carb-clean the MAF sensor (on the intake tube), and try again. Mine did this once and it was just dirty butterflies on the TB.
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Joined: May 2007
Posts: 13,322
From: NW Arkansas
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lincolnshibuya
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Dec 8, 2015 04:37 PM
