ESC & check light problem

[chetwagner at qwest.net]

The knock sensor won't work on a Toyota straight six becaus of the 
noise caused by the valve train.  Solid lifters and about .20 mm 
freeplay makes the engines sound like a diesel.  I know, I have tried.

On 27 Nov 2000, at 14:19, steve ravet wrote:

> Have you looked at the schematics, either in a service manual or on
> the WWW page?  You'd be way ahead to pay $70 or whatever to get the
> factory service manual from helm, www.helminc.com.
> 
> 1)  CEL is supplied +12 when the key is on.  When the ECM wants to
> light it it supplies a ground to the other side of the light. See
> ftp://ftp.diy-efi.org/pub/gmecm/manuals/1227747/747ecm4.jpg
> 
> 2)  Sort of.  There is a voltage level from ESC to ECM that means "no
> knock".  You could force it to that level with some resistors, or you
> could just get a junkyard ESC and connect it to the ECM without a
> knock sensor connected to the ESC, but you'll still get periodic code
> 43s. Once in a while the ECM will run a test where it causes knock by
> advancing the ingition while under load.  If it doesn't see knock
> under these conditions it'll set the code.
> 
> You could either disable the code 43 check, or try to put together a
> knock sensor that works.  I've "read" (for what that's worth) that the
> frequency that the ESC looks for is related to cylinder bore, so maybe
> look for a GM engine/app with a similar bore and use the knock sensor
> and ESC module from that.  The knock sensor uses a 1/4" pipe thread.
> 
> --steve
> 
> TomQ wrote:
> > 
> > Hello all. I am new to the list and I have a question I hope someone
> > can help me with. I am currently installing the FI system from a
> > Chevy S-10 on to my Inline 6 Toyota motor. The FI is from a '88
> > Chevy S-10 w/ 4.3 L TBI. The ECM I am using is #1227747. The Toyota
> > motor is 4.2L so I think I should be OK. Anyway I have everything
> > hooked up and it starts and runs, although not very well. Here are
> > two of my current problems. First the engine light does not come on
> > at all, not anytime. I pulled the light and using a VM checked the
> > voltage at terminal A5, it never goes to 12v. Bad ECM or Prom? My
> > second problem is the motor seems to be retarding the timing all the
> > time. I purchased one of the handheld diagnostic meters (EZLink) and
> > hooked it up to the ALDL. It gave me an error code of 43 ESC
> > failure. checked it out and sure enough I had not hooked it up at
> > all. I guess that would be the reason for the timing retard. Can I
> > just pull the line (terminal B7) high or low to fix the error
> > without getting and installing the ESC module and knock sensor?
> > Thanks
> > 
> > -TomQ
> > SF,CA
> 
> -- 
> Steve Ravet
> steve.ravet at arm.com
> ARM,Inc.
> www.arm.com
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