SSh

I posted this in the conversions & hybrids section, but have not gotten much response.

I am almost finished with the LS1/T56 swap into my 96 Impala SS.

status web page

I used the 2001 LS1 harness and the 96 LT1 harness. I used the LT1 underhood fuses/relays/harness and mapped all of the wires from the LS1 harness. It cranks and my fuel pump comes on, but I get no spark and I am unable to connect with AutoTap to see what is going on. AutoTap is working fine (connected to another vehicle). I confirmed the wiring, BAT and GND at the DLC as well as checked the BAT, IGN and serial data connections at the PCM. I get nothing from AutoTap.

How can I confirm that my PCM is good (anyone near Austin, TX have one I can try or a car I can plug mine into)? Can a dealer test it on the bench?

I did plug my laptop into a 2002 Tahoo and it works fine, so it is not my laptop or cable.

Thanks for any help or suggestions.

Scott

SS SLP2

iTrader: (8)

may like to chk the fuse for cig lighter as this fuse supple power to OBD connection

SSh

I know it is not the fuse as I have pulled the PCM and powered it on the bench as follows:

C1/C2 pins 1 and 40 > ground

C1 pin 19 > fused 12 volts with switch to simulate ignition switch

C1 pin 20 > fused 12 volts

C1 pin 57 > fused 12 volts

C1 pin 58 > serial data

I connected pins 4 and 5 on the DLC connector to ground, pin 2 to serial data and pin 16 to fused 12 volts.

Even with this very simplified “harness” I can not connect to the PCM.

The pin 16 provided power for the GM Tech 2. I am not sure if AutoTap or LS1Edit actually needs this power as the laptop has its own power, but I provided fused 12 volts on this pin anyway.

Thanks,
Scott

SSh

Problem solved. The person I purchased the engine and trans from neglected to mention that the PCM was new and had never been flashed.

Thanks,
Scott