Engine '91 5.0 dies when turning on Innova code reader in Key on Engine Running mode

[YVR_FOX5.0VERT]

So i just picked up the innova OBD1 code reader.

When I try to scan in Key on Engine Off mode, it will cycle the fuel pump and then start reading codes.

With the car running, when I attempt to start the scan, it kills the motor.

Am I missing something here?

 

[Mustang5L5]

Can you try it with a simple jumper wire in the test port to initiate the code reading process just to see if it does the same thing?

 

[YVR_FOX5.0VERT]

Can you try it with a simple jumper wire in the test port to initiate the code reading process just to see if it does the same thing?

I just read a write up on LMR. When using the jumper method it needs to be installed first prior to starting the engine. With the scan tool i attempted to run the scan with it already running. Maybe I need to initiate test first then start the car.

 

[Mustang5L5]

I just read a write up on LMR. When using the jumper method it needs to be installed first prior to starting the engine. With the scan tool i attempted to run the scan with it already running. Maybe I need to initiate test first then start the car.

I use an Innova 3145 to pull my codes. I can initiate the test with the car running and it pulls the codes fine.