Q: Im having and issue with my maf sensor,code p0102

asked by on

Im having and issue with my maf sensor,its giving a code "p0102" the car was running fine i parked it,went to turn it over few days later cranked but wouldn't stay started,long story short i took the connection off the maf sensor and it started up fine,then gave me a code to replace my idle air control so i did,and along with a new maf sensor,i also took my throttle body off for a good cleaning,put it back on with the new maf sensor and its giving me a p0102 code and wont start,if i discconect the cord it starts and runs ok but once i reconnect the cord to the maf sensor while the engine is on it dies back out as soon as i reconnect the cord to the maf,i bought a multimeter and did a voltage test on all 3 pins of the connector,just the connection not the maf,turned the key in the on position but didnt start it,apon test the "pink" wire gave a 11.69v reading,the "black/white" wire gave a 0.03v reading,the "yellow" wire gave a 3.65v reading can you please help?

My car has 150000 miles.
My car has a manual transmission.

The pink wire is battery voltage supply to the sensor. If the battery voltage is 12.6 volts (it should be; otherwise you have a battery problem), you should read 12.6 volts on the pink wire, not 11.7 volts. You may have high resistance in the circuit which will cause a voltage drop. Check to be sure you do not have the sensor installed "backwards" in the air duct. Check the voltage between the black (center) wire (the circuit ground) and the positive terminal of the battery. You should have 12.6 volts; if not you have a bad ground to the sensor. Check for vacuum leaks after the sensor (if air enters after the sensor, the sensor will be incorrectly reporting actual mass air flow to the intake). Once the voltage supply is corrected and the ground is good (to be determined), with no air leaks and a new sensor, if it still does not work there is a problem on the signal (output) side of the circuit (the yellow wire) to the PCM. If you get to that point, I would suggest that you request an electrical circuit/component diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Im having and issue with my maf sensor,code p0102

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Cooling fans not working. Replaced sensor, relays, thermostat and radiator fan.

Hello there, many different faults will cause the fans on your 1995 Chevrolet Camaro to not turn on. You have replaced many of the common failure points, but there are a few other potential causes. The most likely is the...

Q: Transmission slips while going downhill, when braking or coasting

Hello there, issues shifting when going downhill is a bit unusual for the 1998 K2500. There are a few possible causes for the transmission to slip when going downhill. The likely would be that the transmission fluid level is low,...

Q: 2004 Chevrolet Monte Carlo won't stay running

Hello. Problems such as these can be caused by many things. Anything ranging from a bad vacuum leak, to a faulty idle air control valve will cause symptoms such as these. As engine performance problems can many times be hard...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.