OBDII Scanner can't connect(Resolved)
Thread Starter
Teching In
Joined: Apr 2008
Posts: 47
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From: Reno, NV
OBDII Scanner can't connect(Resolved) I have tried 4 or 5 different scanners and they all have the same message. "Error communicating with vehicle".
I have checked the following on the ALDL port,
pins 4 and 5 for ground, pin 16 for 12 volts with key on and I verified continuity from the blue PCM harness pin 7 to ALDL pin 2.
The car runs and drives fine but the SES light is on and it's running rich.
I have checked the following on the ALDL port,
pins 4 and 5 for ground, pin 16 for 12 volts with key on and I verified continuity from the blue PCM harness pin 7 to ALDL pin 2.
The car runs and drives fine but the SES light is on and it's running rich.
Last edited by rusnrno; Dec 2, 2009 at 08:06 PM.
Have you connected to it before using an OBDII scanner?
96 & 97 LT1s can be converted to OBDI and still use the OBDII connector, just like the 95 LT1s, which came from the factory as OBDI with an OBDII connector.
96 & 97 LT1s can be converted to OBDI and still use the OBDII connector, just like the 95 LT1s, which came from the factory as OBDI with an OBDII connector.
Thread Starter
Teching In
Joined: Apr 2008
Posts: 47
Likes: 0
From: Reno, NV
This problem started after I installed the engine out of a 95 Firehawk. I used my PCM and harness. The 95 doesn't have a Crankshaft position sensor so that would be a DTC. I installed my EVAP solenoid, coil and a new 96 Knock sensor. My rear O2s have been disabled in a previous tune by Madtuner.
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Thread Starter
Teching In
Joined: Apr 2008
Posts: 47
Likes: 0
From: Reno, NV
Problem solved!
Put this one in the "Dumbest things I've done" thread.
Here's what happened. During the time I was swapping engines, I ended up with 3 PCMs. One was my original(OBD2), one was out of the 95 Firehawk(OBD1) that I parted out and a 3rd one. I had marked each of them, but, somehow I switched the 96 with the 95 and installed it in my car.
I discovered this when trying out the other PCMs to see if the one in the car was fried. The car ran better and I checked the service numbers and Voilla!
All the pieces of the puzzle fell together after that. The high idle, running rich, the ALDL port not working, etc.
Put this one in the "Dumbest things I've done" thread.
Here's what happened. During the time I was swapping engines, I ended up with 3 PCMs. One was my original(OBD2), one was out of the 95 Firehawk(OBD1) that I parted out and a 3rd one. I had marked each of them, but, somehow I switched the 96 with the 95 and installed it in my car.
I discovered this when trying out the other PCMs to see if the one in the car was fried. The car ran better and I checked the service numbers and Voilla!
All the pieces of the puzzle fell together after that. The high idle, running rich, the ALDL port not working, etc.
