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TAke a paper clip or other wire and short "A"&"B" terminals together on the aldl test connector under the dash. Count the flashes of the check engine light with the ignition on. One flash pause then 2 flashes is a code 12 and means the system is working. Each code wil repeat 3 times, then the next one will show.
What else can I help you with?
How do you read the codes for a 2002 Chevy Tahoe without scanner?
You can't. It requires a scanner to read them.
How do you get trans codes on a 93 Chevy 2500?
That requires an OBDII engine scanner to read the transmission codes.
Why is engine light is on 97 Chevy Blazer?
To tell you to read the diagnostic codes.
Where is the idle sensor located on a 1987 Chevy Celebrity?
The idle speed is read by the Engine Control Module(computer) and adjusted as necessary by use of the idle air control in conjunction with the throttle position sensor. There is no separate idle sensor as such.
How do you read codes without a reader on a 2001 Chevy Tahoe?
YOU CAN"T. Engine must be scanned
96 Chevy Blazer how to find codes?
Many auto parts stores will read the codes for you for no cost if you purchase the parts needed for repairs from them.
Where is the fuel pump relay located on a 1987 Chevy Celebrity?
everyone should have a manual for their vehicle, and the library should have a professional shop manual available in the reference section for FREE to make copies of...read up and fix like a pro!! :) Dave
How do I get MY 2001 Chevy Silverado to blink codes?
The OBD2 system will not BLINK codes for you. It requires a engine scanner to read the codes. HAVE ENGINE SCANED. Some parts stores will do that for free.
How do you find 1999 Chevy fault codes?
96 on up you need a code scanner,you can take it to auto zone to have the codes read ,free of charge.
What causes the service engine soon to come on . 2003 Chevy S10?
There's over 100 Chevy codes that will make it come on-you need to have code read
How do you manually check 2003 Chevy Express van engine light code?
It takes a scanner to read the codes.
How do you troubleshoot your 1987 celebrity when you get up to 60-70 mph your service engine soon light comes on and the car seems to sputter you have replaced the filter plugs wires?
When the check engine light comes on it posts a code in the ECM. Your next step then is to read the code or codes and go from there.
