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MAP sensor data disappearing

1037 Views 3 Replies 2 Participants Last post by  Snipesy
I think I made a mistake lol, if anyone had this issue or thinks they know what might fix this please help.

I bought a 2014 chevy cruze a month ago from a used car lot. Engine seemed fine, no check engine lights, etc. 3 days later CEL came on, there were 5 codes stored to do with MAP, MAF, engine lean, Evap purge valve.

I replaced the evap valve, valve cover, ignition coil/spark plugs, MAP and MAF sensors, air filter.

After still not fixing the codes I took it to an auto shop, the said the MAP data was dropping sporadically from the computer they had hooked up, and that it's a needle in a hay stack, they bowed out of the project.

My next steps are that I'm going to clean up all of my grounds, and then test the 3 wires on the MAP sensor to see if one is bad in the wiring harness. After that I'll be at a loss, other than replacing the PCM/ECU. Really not trying to replace my whole wiring harness, so if it is one of the individual wires, I'll be running a separate wire in chafe guard along the wiring harness.

Has anyone seem or heard of an issue like this?
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Are you getting stabilitrak issues? If so its a big grounding issue.

If not errr most likely someone replaced the MAF sensor in the past and somehow screwed up the connector. Unfortunately I see crap like this alot and you're kind of just boned. You eitheir replace the harness orrrrrr find a donor harness to end to end solder.
 

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Discussion Starter · #3 ·
Are you getting stabilitrak issues? If so its a big grounding issue.

If not errr most likely someone replaced the MAF sensor in the past and somehow screwed up the connector. Unfortunately I see crap like this alot and you're kind of just boned. You eitheir replace the harness orrrrrr find a donor harness to end to end solder.
No stabilitrak issue, I'm hoping I just have a chafed wire that runs to my MAP sensor, I'll buy the tool to remove the pins from the plugs so I can run a brand new wire, so long as I can avoid pulling the motor for a whole new wiring harness. I'm just hoping it's that simple.

It is my MAP data that is disappearing, did you mean to say MAF for a messed up connector, cause if so I'll definitely check those wires as well. And me being boned is pretty much what the auto shop told me 😂 that's what I get for going to a sketchy used car lot.
 

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No stabilitrak issue, I'm hoping I just have a chafed wire that runs to my MAP sensor, I'll buy the tool to remove the pins from the plugs so I can run a brand new wire, so long as I can avoid pulling the motor for a whole new wiring harness. I'm just hoping it's that simple.

It is my MAP data that is disappearing, did you mean to say MAF for a messed up connector, cause if so I'll definitely check those wires as well. And me being boned is pretty much what the auto shop told me 😂 that's what I get for going to a sketchy used car lot.
Same idea for eitheir.

The MAP is an analog sensor which the ECM interprets.
The MAF is a digital sensor which gives digital data…. Which the ECM interprets.

That’s the only difference between the two in terms of wiring.
 
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