code 42

[wbzautocustomiz]

Ok from earlier thread code 42 info is EST or bypass signal may not be present does anyone know how to check this out want to see before I just replace ign module and still have same problem so I would like to check all first, or even if someone has a wiring schematic and values of wire for reference, Thanks

 

[TurboBuRick]

Well you could ohm the wires or just switch one from another car.

 

[wbzautocustomiz]

I dont have the option to try another and ohm wires, which wires?

 

[TurboBuRick]

Pin B4 white wire is the EST. It goes from the ECM to the ignition module.

Here is the ecm pinout Scroll down the page it also shows the module.

 

[wbzautocustomiz]

Thanks going to check it out

 

[wbzautocustomiz]

update

Ok EST wire B4 white (1.10-1.12) @ ECM is reading correct values and bypass wire D5 tan/blk (4.55-4.56) is reading correct also. Now should I think that the code 42 is indeed a bad ign module and/or coil maybe? Car had new ign module, coil and chip about 1 year/1500 miles and has done alot of sitting, open to all that would chime in on this and thanks to all.

 

[salvageV6]

What's the build up on it?

You have a translator system on it?

Does it set the code always or just intermittantly?

Check and clean the ECM and module connectors/pins.

 

[gsgns4me]

Ok EST wire B4 white (1.10-1.12) @ ECM is reading correct values and bypass wire D5 tan/blk (4.55-4.56) is reading correct also. Now should I think that the code 42 is indeed a bad ign module and/or coil maybe? Car had new ign module, coil and chip about 1 year/1500 miles and has done alot of sitting, open to all that would chime in on this and thanks to all.

Did you try following the diagnostic trouble tree that I linked to in your other thread? Having a "road map" to go by is better than guessing.

 

[wbzautocustomiz]

No build up just stock w/ chip and exhaust, code 42 is constant on scanmaster car breaks up and stutters real bad as it gets to 2500-3000 rpm, yes have cleaned ecm ends and ecm connectors and I will check on thread also. Thanks