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1993 Oldsmobile Cutlass Diagnostic code 15

Tiny
CRAIG616
  • MEMBER
  • 1993 OLDSMOBILE CUTLASS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 174,000 MILES
Hello, I jumped the diagnostic plug and received code 12 and code 15 I realized code 12 always comes up. So I am wondering what code 15 is.
1993 olds cutlass supreme 3.4 auto 174000 miles

Thank you
Craig
Sunday, March 9th, 2008 AT 1:59 PM

8 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Coolant temp sensor circuit reading too low. Test replace sensor.
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Sunday, March 9th, 2008 AT 2:01 PM
Tiny
CRAIG616
  • MEMBER
  • 4 POSTS
Would that have an impact on the engine not revving over 3000 rpm?
The engine will not rev over 3000 rpm it just cuts off when it reaches that?
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Sunday, March 9th, 2008 AT 2:51 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS


https://www.2carpros.com/forum/automotive_pictures/139033_4wd_3.jpg

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Sunday, March 9th, 2008 AT 2:58 PM
Tiny
CRAIG616
  • MEMBER
  • 4 POSTS
Hello, thanks for the info, but would this have a affect on the engine not revving over 300rpm's?
Each time the engine reaches 3000 rpm the engine is like bogging down, also it will backfire through the intake?
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Sunday, March 9th, 2008 AT 4:32 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Its possible. Replace sensor and we will take it from there. You could have another problem but coolant temp sensor reading incorrect will directly affect the injector pulse. Ps sorry about the schematic that was hard to read, im just learning how to use that part of the laptop.
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Sunday, March 9th, 2008 AT 4:35 PM
Tiny
CRAIG616
  • MEMBER
  • 4 POSTS
Thanks for the reply, does that sensor read the temp of the coolant? Because the temp gauge is working in the cluster.
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Sunday, March 9th, 2008 AT 8:19 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
2 different parts, you asked about code 15 I told you what it is? Test the sensor with an ohm meter. Take a reading when cold leave it connected as it warms up. You should see a large difference in the reading from the thousands down to about 177.
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Monday, March 10th, 2008 AT 2:26 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS


https://www.2carpros.com/forum/automotive_pictures/62217_ECT_6.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_ECT1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_ECT2_2.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_ECT3_1.jpg

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Monday, March 10th, 2008 AT 2:36 AM

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