Car is a 2003 Protege5 w/ 5 speed.
Recently, for the first 5-15 minutes from a cold start, the "battery" light has been coming on. Voltage (at the OBD port) registers around 11.3-11.5V at that time.
After the first few minutes, the voltage jumps up to ~13.3V, and stays there for the rest of the trip.
If I restart it from hot, the light usually doesn't come on. If I restart medium-cold, it often goes away more rapidly, or doesn't come on at all.
Although not quite what I'd expect, I figured this was the voltage regulator in the alternator going bad. (Since this doesn't seem like anyone's IAT sensor going bad that I've read)
Today I scanned codes (while the light was on), and got a "Pending" P0507 - Idle Control System RPM Higher Than Expected
I can't figure out exactly what this code means - is this pointing to the IAT sensor?
I'm in an apartment that doesn't allow work on cars, so I'd rather fix it all in one go. And I'd rather not replace the OEM alternator with a rebuild if it's not bad.
Any thoughts?
Recently, for the first 5-15 minutes from a cold start, the "battery" light has been coming on. Voltage (at the OBD port) registers around 11.3-11.5V at that time.
After the first few minutes, the voltage jumps up to ~13.3V, and stays there for the rest of the trip.
If I restart it from hot, the light usually doesn't come on. If I restart medium-cold, it often goes away more rapidly, or doesn't come on at all.
Although not quite what I'd expect, I figured this was the voltage regulator in the alternator going bad. (Since this doesn't seem like anyone's IAT sensor going bad that I've read)
Today I scanned codes (while the light was on), and got a "Pending" P0507 - Idle Control System RPM Higher Than Expected
I can't figure out exactly what this code means - is this pointing to the IAT sensor?
I'm in an apartment that doesn't allow work on cars, so I'd rather fix it all in one go. And I'd rather not replace the OEM alternator with a rebuild if it's not bad.
Any thoughts?
