Runs rough and will not accelerate

Tiny
DURHAM415
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 188,000 MILES
I have the vehicle listed above 4x4 that will crank up and idle barely, and when you try to give it has it shuts off. I've changed the Mass flow sensor. It gives a p15p15 code. I checked the wires to make sure the ground was good. I checked a yellow wire specifically that gets broken and it's fine. I'm thinking it's the PCM that's bad but not sure. So I'm wondering if it just needs to be updated is this something I can do if I buy a better Diagnostic device? So if mine is bad they have these on eBay for sale for $89.00 dollars and you send them your VIN and they will program it and send it to you. Maybe it's the crankshaft position sensor or the camshaft sensor? Well anyway I sure hope you can help me. Oh yeah my friend is the one who had the Diagnostic device and there were all kinds of ABS codes given, but he said that didn't have anything to do with the vehicle not running.
Monday, March 9th, 2020 AT 8:59 PM

7 Replies

Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
A P15P15 is not a valid code. It would be a P with 4 numbers behind it like P2015. Please check the codes again and update and we can get you going.

Rich
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Monday, March 9th, 2020 AT 11:08 PM
Tiny
DURHAM415
  • MEMBER
  • 5 POSTS
Okay, so the code was p1515. I misunderstood my neighbor. I will be getting a Diagnostic tester in a couple of days and that will help me so I can do it myself.
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Tuesday, March 10th, 2020 AT 10:21 AM
Tiny
DURHAM415
  • MEMBER
  • 5 POSTS
So the check engine light never came on and he cleared the p1515 code from the vehicle. I don’t have a Diagnostic tester so I can’t tell if it come back. I unhooked the negative battery cable as well in hopes it would reset the PCM. Of course I don’t know if that’s the issue, but it was worth a shot. Of course it didn’t work and I don’t know what else to do. So if you put both my emails together you can see what all I’ve done which isn’t much. Thanks for whatever help you can give me.
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Tuesday, March 10th, 2020 AT 10:31 AM
Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
P1515 causes:

Bad connection at the Throttle Actuator Control (TAC) module
Bad TAC module
Bad Throttle Pedal Position (TPP) or Throttle Position (TPS) sensors
Binding or bent throttle plate-failed throttle body

You will find the test procedures and locations below.

There is no test listed for the TPS so if all checks well with the others just replace the TPS.

Rich
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Tuesday, March 10th, 2020 AT 10:58 AM
Tiny
DURHAM415
  • MEMBER
  • 5 POSTS
Well thanks for the speedy response and all the info. I am absolutely in awe of the knowledge you have sir. Thanks again and hopefully the weather will get a little better this next week for me to work on it. Thanks Thanks Thanks.
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Tuesday, March 10th, 2020 AT 11:10 AM
Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Thank you and my pleasure. Let me know what you find out or if you need anything else.

Rich
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Tuesday, March 10th, 2020 AT 12:06 PM
Tiny
DURHAM415
  • MEMBER
  • 5 POSTS
I will. Thanks for getting back to me.
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Tuesday, March 10th, 2020 AT 12:18 PM

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