Dave416

I replaced the voltage regulator on my alternator last weekend. After I put everything back together and started the car I immediately got a error code indicating my PSM and ABS were not working. I drove the car around for a bit and then I got a check engine light. The check engine light code is P0102, MAF sensor low voltage. The car drives perfect. The voltage is reading 14 volts when running. I replaced the MAF sensor with a new one, cleared the code and nothing changed. Does anybody know what could be going on here?

PS: I do have a K&N air intake if that makes any difference. I had it on before I did the work and did not have any check engine lights, beside low voltage.

AWDGuy

this is a stupid question, but MAF sensor plug is in correctly?

I get the same lights and code when unplugging my MAF for testing purposes.

Dave416

I believe it is plugged in correctly. I double checked the direction of the MAF based on pictures I found on the net and made sure the plug was clipped in firmly.

sfv_rider

I had the same after replacing my alternator, and it was because I left the MAF disconnected at the end of the job.

After it was reconnected and the car restarted, the PSM / ABS warning lights went out as I pulled away from the curb. I've had no issues in the 3 months afterwards.

Ahsai

Disconnect your MAF and check the pins on the harness side with key ON engine OFF.
Pin 4: 5v
Pin 2: 12v
Pin 3: almost 0 ohm between pin 3 and ground