i have a 95 z28 6spd. had the engine and ecm redone last summer .got the car running and the fuel pump went out.put a new pump in fired it up and let it runabout 10 min then it started sputtering and backfiring throught the intake and set a service engine lite. my 95 has the obd1 system with the obd2 plug. i bought a scanner to do both 1 and 2. plug it in and it powers up but says unable to connect check dlc connection. all fuses are good nothing seems out of the ordinary any ideas what may be goig on

 

What brand is the scanner? Are you manually switching it to OBD-1 mode (serial data is on pin 9 on a 95 OBD-1, pin 2 on a true OBD-2). Do you have 12V at pin "16" (lower row, right hand corner)?

 

i bought the innova 3120 from all the research i did it says it should work. i also callled their tech support numvber and the as well said it shoudl work..tried on a few other cars just to make sure it worked rite all went goood...

 

Answer the rest of the questions.

Read post #2 in this thread:

https://www.camaroz28.com/forums/gen...rchase-882598/

 

not really sure what u mean manually switching it over? i have a 16 pin connector on the car and on the scanner....

 

i checked the voltage the bottom ritght pin. im showing 11.83 volts at the pin..

 

How does the scanner know if it's reading an OBD-1 PCM or an OBD-2 PCM? It has to know which pin in a 16-pin connector feeds the data stream. Do you have to enter a VIN, engine code, etc.?

 

The Innova 3120 is known to not work on our cars.

Innova 3120d OBD1/OBD2 scanner - review - ECM/PCM Product Reviews - Firebird Nation

 

I posted a link to a thread that indicates that. If he had done a search on "Innova 3120" he would have found that post, showing where it did connect, it would produce a faulty list of 8 codes, because as GaryDoug discovered, it has a faulty database for the codes.

 

Your research has failed you. Return the Innova 3120, and for about half the money buy this one, which will work:

You will need the CP9127 OBD1 cable adapter also:
GM OBD I ALDL Cable Kit Cp9127 - Actron (CP9127)

Amazon has the best price on the scanner but not on the adapter cable.

My review:
Actron CP9185 Elite AutoScanner - ECM/PCM Product Reviews - Firebird Nation

 

well thanks for the scanner info..sounds like even though they say it should work there are more people who telll me it dont...it dont help the scanner instructions have one paragraph oh how to use this pile of crap...another ? right before the car diedi went to hit the gas it sputtered bad smelled really rich and backfired through the manifold...sound like a bad ecm or iac or tps ? ideas

 

Sounds like opti rotor failure.