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Check engine light, on symptoms?

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

The fuel trims are good. Did you not if the voltages changed when you hit the throttle? They are at the outer limits, so I'm curious how they reacted.

I went through the manual again. I attached the diagnostics below that we need to follow. Don't be overwhelmed. Take a look through them and let me know if you are comfortable performing them.

Take care and let me know your thoughts.

Joe

See pics below.
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Sunday, February 19th, 2023 AT 10:18 PM
Tiny
PAINT 4440
  • MEMBER
  • 14 POSTS
Hello Joe,

I haven't started checking out the list of diagnostic info you sent but let me run something by you and get your opinion. Is it possible for a bad or going bad PCM OR ECM to throw faulty codes? The reason I ask is on this rig you can check your average mpg running through a sequence on the dash. The last time I checked this it was going bonkers. Anywhere from 8 to over 50 mpg. So, I am wondering if the computer is bad?
Thanks,
Greg
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Monday, February 27th, 2023 AT 7:31 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

Yes, the PCM could cause a false code. However, the code diagnostics are usually related to checking the PCM.

Let me know.

Joe
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Monday, February 27th, 2023 AT 5:51 PM

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