Engine cranks will not start

Tiny
TOMVIS
  • MEMBER
  • 2004 BUICK RENDEZVOUS
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 270,000 MILES
I scanned it with SnapOn Ethos it says no cam present in the data. I replaced cam sensor and PCM. There’s like a 16 wire connector for the fuel injectors and I don’t get any pulse there there’s power. I think the cam sensor comes out of that harness also it plugged in under the power steering pump. Does anyone have a diagram of that connector?
Monday, December 7th, 2020 AT 4:02 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

I attached three pics below. Pic 1 shows the cam sensor. Pics 2 and 3 show where the wires from the sensor end. All three go to the PCM.

Is this what you needed?

Let me know.
Joe
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Monday, December 7th, 2020 AT 8:10 PM
Tiny
TOMVIS
  • MEMBER
  • 1 POST
Yes, I’m going to check continuity from the sensor to the PCM. The car is been sitting at my cottage so I can only work on it on weekends. I replace the cam sensor in the PCM I’m not sure why on my scanner it says no cam. Maybe it’s a wire I’ll find out and let you know the stupid sensors underneath the power steering pump so it’s a lot of work to take that off just a check from that end. Is there a magnet or something on the cam gear that could fall off? I had an older Buick do that but it would still start and run. The system won’t start without a cam signal would it?
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Wednesday, December 9th, 2020 AT 8:45 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
The sensor is used by the computer for fuel injection timing. As far as a magnet, yes, but I don't see how it would fall off.

If you look at the attached pic, it shows what each wire is used for. Note: Low reference should show continuity to ground. I'm adding them in the event you want to check.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

____________________________

Let me know what you find.

Take care,
Joe
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Wednesday, December 9th, 2020 AT 8:45 PM

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