Searching for OBD codes..Surprise!
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Searching for OBD codes..Surprise!
Yesterday I checked for trouble code in my ECM via ALDL.
I used a small section of electrical wire to connect the A with the B pin in the ALDL (as see in the Haynes manual -1984.1996 corvettes-).
The check engine light flashed a code 12 three times and . Then again code 12.
...There are NO stored codes in the system...
The strange thing is that when I connected the A pin with the B pin in the ALDL connector, under the hood I noticed a noise like a fan, or a electric pump. When I disconnected the wire the noise disappear.....
(I'm sure I connected the A pin with the B pin located in the top right side of the ALDL connector.
Why this noise??, Maybe the fuel pump??
Thanks in advance.
Beppe
I used a small section of electrical wire to connect the A with the B pin in the ALDL (as see in the Haynes manual -1984.1996 corvettes-).
The check engine light flashed a code 12 three times and . Then again code 12.
...There are NO stored codes in the system...
The strange thing is that when I connected the A pin with the B pin in the ALDL connector, under the hood I noticed a noise like a fan, or a electric pump. When I disconnected the wire the noise disappear.....
(I'm sure I connected the A pin with the B pin located in the top right side of the ALDL connector.
Why this noise??, Maybe the fuel pump??
Thanks in advance.
Beppe
Instructor
Joined: Jul 2001
Posts: 198
Likes: 0
From: Dead center of Seoul
Re: Searching for OBD codes..Surprise! (conv90)
This is normal...you put the computer in diagnostic mode. The fan comes on, the fuel pump engages, the sensors are "sensed" :D
Looks like your in the clear.
Looks like your in the clear.
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: Searching for OBD codes..Surprise! (Dave's_88)
This is normal...you put the computer in diagnostic mode. The fan comes on, the fuel pump engages, the sensors are "sensed" :D
Looks like your in the clear.
Looks like your in the clear.
