Code 41 circuit failure

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I have had this code on for some time. I have replaced I think almost every thing that would cause this problem. I am thinking I may have fixed the problem.Then I may have made another one?
I have a WELLS coil pack and Module.I have taken the volt at the ECM. It's 5.7 volts ,so then I went to the Module Harness it came out of the module at 5.7 volts as well.So I don't have a volt drop. But My undering standing from the large Buick book .The ECM must read 6 volts.So with it being a little short it's going in to simultaneous mode.
So does it sound as I need to get the WELLS unit out and put in a A/C Delco unit? I guess it the module the give the 6 volts ?

And what is CKT 630?

Thanks,Rob

 

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Anyone???

 

[Joe 1320]

Code 41 is a Cam Sensor failure...... Cam sensor is bad, unplugged, or broken wire.

The cam sensor is a magnetic "hall switch" type that provides the ECM with a voltage signal on the #1 cylinder compression stroke. This information is used by the ECM to to properly time sequential fuel injection. When the cam signal is interupted to the ECM, after the engine is running, fuel injection is simultaneous rather than sequential. After ignition is shut off, and the cam signal is still not received by the ECM, the engine will crank, but not start. A code 41 is set when:
*the engine is running
*Cam sensor signal not seen by the ECM for more than one second.

The voltage recorded at this point , is 12 volts supplied by the ignition module, but must be pulsed by the cam sensor to be recognized by the ECM as a signal of 2 to 9 volts. This is why voltage is is checked while cranking the engine.

CKT stands for circuit. 630 is the cam sensor wires. #631 is the grey/red 12V signal, #633 is the light blue to the buffer amplifier, #632 black is the signal ground.

It goes back to the first statement that is is a problem with the cam sensor/ wires.

 

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Thanks Joe 1320

I have been fighting this code for some time.
I have replaced the cam senser {complete with shaft} And replaced the ECM coil pack and mod.With a WELLS. I called Casper at one time and we thought it may be the wires that go from the Mod. to the cam sensor.He made it up for me and I replaced them.Still no luck.I replaced the plug going to the Mod.I have the casper cam sensor setting tool.So I feel it's set right.
I go the Helm book for 87 Buick.I looked up the 41 code and it Stated that the ECM must see 6 volts or it goes into Failure.I only get 5.7 volts.Im guessing that 12 volts is suppled to the mod.Then 6 volts from the Mod.IS sent back to the ECM? If there is 6 Volts is not there it goes into Defalt?

So I was thinking it may be my Mod.?

 

[Joe 1320]

After clearing codes from memory, Disconnect the ECM A-B connector and connect a volmeter between ecm terminal A-11(black wire) and ground. Crank the engine and you should see varying DC voltage between 1-9 volts. If not, (ignition off) disconnect the ignition module connector and check the cam sensor wires for open or shorts to the B+ or ground. If that checks OK, it is a faulty ignition module connector terminal "J"(black wire) or it is a bad module. This diagnostic comes right out of the factory manual.