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signofhorse
New User
Aug 21, 2012, 7:15 PM
Post #1 of 2
(2972 views)
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high idle
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2001 Hyundai Accent GL 1.6L engine. Having problem with high idle. P0507, P0102 codes. Replaced Mass sensor, pvc valve n throttle position sensor. Erased codes n then came back on. Read same codes. Do u have any ideas. Idles about 1700rpm should br about 850.
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 22, 2012, 3:34 PM
Post #2 of 2
(2921 views)
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The P0102 code will set if the PCM sees an open circuit in the MAF signal circuit or if the reading from the MAF sensor is unusually low.
Check the air duct and make sure it isn't ripped. Inspect the MAF air flow sensor wiring, connector, and pins and make sure the wiring isn't broken underneath the insulation and the terminals in the connector are clean and tight. If all that checks out good you'll need a scan tool to look at air flow rate and a good digital volt meter or scope to watch the MAF sensor output voltage to see if it is within specs for the air flow rate.
The high idle could be from a vacuum leak after the throttle body or a malfunctioning ISC valve. You can check the ISC valve by ohm checking the coils inside it to check for any opens in the stepper coils. If the coils are good, you would have to monitor stepper motor control from the PCM to be sure the ISC is being commanded. I found the best way to check for control is by using an oscilloscope. Most DIY don't have one laying around, so you might need to take it to a shop that does drive-ability that has the equipment.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 22, 2012, 3:34 PM)
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