ESC diagnostic
am018
am018 at post.almac.co.uk
Sat Sep 5 11:01:31 GMT 1998
Try (lightly) hitting the block with hammer ner the sensor with engine idling on some systems it will cause the idle speed to hunt.
Joe Boucher wrote:
> I don't think my ESC module is working. I was experiencing knocking, so I retarded my timing. Then I thought, that ain't the way this is supposed to work. So, I dug in the factory manual, and
> found some diagnostics.
>
> I thought the system worked by grounding a wire from the ESC module through the knock sensor. The one in the Suburban was new when I installed the engine. The diagnostics said to disconnect
> the knock sensor and hook that wire "momentarily" to a 12 volt source while watching the timing mark. Well, I tried both ways, 12 volt and grounding, and didn't notice any difference in the
> timing.
>
> There was voltage at the ECS module, so it is powered.
>
> I forgot to hook the knock sensor up and the next day the check engine light came on. I rehooked the wire up and started the engine and the light was out. I was rushed and didn't use the ALDL
> to look for trouble codes. I'm assuming the ECM somehow figured out the wire was disconnected, but how if the module isn't working?
>
> Any suggestions?
>
> Thanks,
>
> Joe (Looking for fly turds) Boucher
> '70 RS/SS Camaro '81 TBI Suburban
>
More information about the Diy_efi
mailing list