The vehicle we were working on is a 99 Subaru Legacy Wagon 2.2 motor and 5 speed manual trans. The code present was P1507 for the idle air control solenoid. The symptom was intermittent stalling when coming up to a stop light or intermittent hard starting. I had this DTC and wanted to know if or how I could test the IAC before I replaced it. I googled it and after much reading of people who did not have a diagnostic process to their approach and just started throwing parts at it hoping to fix it, I found that it could either be the IAC or a neutral switch causing the problem. Seeing as the IAC is about $180 or more and the switch is $20-30 I decided to do some testing to figure out which it is before I go spending too much money unnecessarily.
I decided to do a thorough write up and explain why sometimes a gear position sensor sets a code for the idle air control in this particular model year Subaru.
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AuthorWalker Crystal Archives
May 2019
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