Codes P1505 and P1507, random or multiple misfires?

EARL91

MEMBER
2004 HYUNDAI SONATA
2.7L
6 CYL
2WD
AUTOMATIC
220,000 MILES

2004 Hyundai sonata had codes for random or multiple misfires. Replaced coil pack. Deleted the code and it has not come back. The car still idles and runs as if a misfire. And still stalls. Throwing a p1505 and p1507 code now. And one for the MAF sensor. I unplugged the IAC valve and the car shuts off. So, idk were to go from here.

1 Reply

AL514

MECHANIC
4,795 POSTS

Hello, are these the code definitions you are seeing on your scan tool? And exactly what code for the MAF are you getting?
P1505 IDLE SPEED CONTROL ACTUATOR SIGNAL LOW OF COIL #1
P1507 IDLE SPEED CONTROL ACTUATOR SIGNAL LOW OF COIL #2
This is not referring to Ignition coil 1 and 2, it is the Coil windings inside the Idle Air control (IAC) valve. There is a resistance test on the 3 wire IAC valve while unplugged, engine off. As well as a power feed check if you have a basic multimeter. But we also need to know MAF code is setting.
The first thing to check with these two codes (P1505 and P1507) is the 12v power feed to the IAC, with the IAC unplugged and Key On engine off, check the pink wire with the red meter lead and the other meter lead on battery negative. There should be a full 12volts on the pink wire.
The 2nd test is checking the internal coil windings to the IAC.
There are updated measurement values for the IAC resistance. So, you would unplug the IAC and check across pins 1 and 2, and then 2 and 3. (Diagrams below)

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Images (Click to make bigger)