No connection

[jannes_z-28]

I have a 69 Camaro with an LS1/T56 from a 2001 Camaro in it. I have now a problem were I can not connect to the PCM. Efi Live says that it cannot connect to the PCM and try to turn off ignition and so on.

I have tried with another scandevice to se if anything is wrong with my cable or Flashscan and it didn't work either.

So how can I go forward in my search for faults. The pins 2 & 16 on the connector has voltage when ignition is on. Pin 16 has voltage when ignition is off as expected.

The connectors Pin 2 is connected to the C230 plug pin K.

Since I have voltage on Pin2 doesn't that mean I have signal?

I should also say that the engine is working and runs OK.

Any help is appreciated.


Thanks

Jan

[joecar]

I believe you also need ground connections on pins 4 and 5.

[jannes_z-28]

Yes, they are of course connected to ground.


Jan

[joecar]

Here are the PCM circuit diagrams for 2001 F-body...

87623186.gif shows the DLC connections...

Do you have anything else connected to circuit 1049...?

[jannes_z-28]

It is connected like that schematic.

I have had connection before and made a scan with Efi Live. I did also some changes like removing VATS and the O2 sensors after the cats before I started it the first time. Then everything worked as expected.

Now it doesn't.

Since I have voltage on Pin2 I assume there is a signal, or?


Jan

[joecar]

It is connected like that schematic.

I have had connection before and made a scan with Efi Live. I did also some changes like removing VATS and the O2 sensors after the cats before I started it the first time. Then everything worked as expected.

Now it doesn't.

Since I have voltage on Pin2 I assume there is a signal, or?


JanIt's hard to say because the signal is VPW (variable pulse width squarewave)...

If you have a scopemeter, you could see if it was a steady voltage (bad, maybe shorted, or bad PCM) or a variable square-like waveform (good).

[jannes_z-28]

Ok thanks,

I'll try to find a scope and see how it looks.


Jan