96 chevy SBSC with L31R
I just got my flash/tune from Blackbear, and am trying to install thru OBDII port using an Autocal. I keep getting a $0281 error code when trying to load the tune to 0411 ecm. BB says that is a communication error code, and could be issue with OBDII port wiring or ignition wiring. The ignition seems to work properly, and truck turns over just does not start. The OBD port is powering my autocal.
I've verified my cig lighter is operational, pulled the AM radio fuse (and radio batt fuse), and I double and triple checked the wiring diagram I received from Lextech. Still getting the error code.
The only strange wire I was left with from the repin was a blk/wht jumper wire. It was from the blackbox C3-18 and C4-12 pin slots. My wiring diagram says that C3-18 goes to C2-1(0411) & C4-12 goes to C240 (0411). I've tried wiring the ground jumper to C2-1 and C2-40, tried it without the ground jumper in those pin slots, and tried with C2-1 & C2-40 spliced in with the ground C1-1 connector. Still getting the 0281 code.
Does anyone have any ideas ?
Thanks,
Mike