ALDL Fault Codes

[Dynomite]

Originally Posted by janozr1

thank you...….but i have 16 pin plug...

Existing ALDL Code Reader for 90'-93'.........................ALDL Code Reader used with Adapter for 94'-95'

For the 16 Pin ALDL.......
Ground is Pin 4
Ground to Pin 6 is ECM
Ground to Pin 8 is PKE (Alarm System)
Ground to Pin 12 is CCM
Ground to Pin 3 is SRC
So....in the adapter if I Connect the 16 Pin end to the 12 Pin end as follows:
16 Pin (94'-95')......12 Pin (90'-93')
Connect Pin 4 to.... Pin A
Connect Pin 12 to.. Pin G (White Button)
Connect Pin 8 to.... Pin H (Black Button)
Connect Pin 3 to.... Pin C (Yellow Button)
Connect Pin 6 to.... Pin B (Green Button)

[carguyjoe]

Can someone recommend a scan tool that works with ALDL/OBD1? I've seen the adapters that go from 12 pin to 16 pin but they have horrible reviews.

[SAHall]

Originally Posted by carguyjoe

Can someone recommend a scan tool that works with ALDL/OBD1? I've seen the adapters that go from 12 pin to 16 pin but they have horrible reviews.

If you want access to all the OBD1 scan features, try to track down a Tech 1 or Tech 1A scan tool and appropriate cartridges on eBay. I can send a list of useful Tech 1 cartridges if you are interested in exploring this route.


Sent from my iPhone using ZR-1 Net Registry

[XfireZ51]

Originally Posted by carguyjoe

Can someone recommend a scan tool that works with ALDL/OBD1? I've seen the adapters that go from 12 pin to 16 pin but they have horrible reviews.

Are u looking to simply determine what MALF codes u have or trying to datalog ALDL datastream?

[carguyjoe]

Currently I don't have any idiot lights on, so I guess I wanted to look back at history, and be ready if anything goes wrong. I also have a Fox Body Mustang which I believe is also some form of OBD1, so I was looking for something that would get both cars. But now in looking I can see it gets expensive with all the adapters.

[XfireZ51]

Originally Posted by carguyjoe

Currently I don't have any idiot lights on, so I guess I wanted to look back at history, and be ready if anything goes wrong. I also have a Fox Body Mustang which I believe is also some form of OBD1, so I was looking for something that would get both cars. But now in looking I can see it gets expensive with all the adapters.

OBD1 should be the same 12pin for all makes. Code should lite SES unless it was cleared or u started the vehicle 50 times w/o recurrence of fault.

[Perry Mitchell]

The LT5 motor in my 67 Camaro flashes what I believe to be 66. Your list does not show a code 66 but doing further research I found information that says a code 66 represents a low or high power switch voltage. What does that mean? The valet key has been grounded to allow full power at all times. Any ideas?

[XfireZ51]

Originally Posted by Perry Mitchell

The LT5 motor in my 67 Camaro flashes what I believe to be 66. Your list does not show a code 66 but doing further research I found information that says a code 66 represents a low or high power switch voltage. What does that mean? The valet key has been grounded to allow full power at all times. Any ideas?

One question is which calibration are u using? What MY ZR?
Is the power switch from a 90 or 91-95? There’s a difference.
Was ur calibration modified for power switch being ON.

[Perry Mitchell]

Thank you for the response. My motor and computer are from a wrecked 91 ZR1. To the best of my knowledge, no recalibration has ever been done. The only engine modification is the installation of long tube headers. I removed the cover from the prom and found the following information: DELCO/AXFK/0277 and 060075.The instructions from the engine wiring harness kit said to simply ground the one terminal that would have otherwise run to the switch if full power all the time was desired. The motor starts fine, idles fine but is extremely rich. Any advice?

[-=Jeff=-]

Power key on a 1991 does not work by grounding the pin.. you need a 645 ohm resistor across the power key pins on the ECM. that will keep it in Full Power mode