User's Manual

19
7.1 THE "CHECK ENGINE" LIGHT
Normally, the "check engine" light should come on when the ignition is turned on and then go out a few
moments after the engine starts running. If it reappears, or stays on while the engine is running, the
computer has detected a problem and a trouble code has been set.
NOTE: The engine will not run unless the computer has been reprogrammed to remove the antitheft
functions. The computer will set codes for all unused emissions devices and the check engine light
will stay on unless the emission functions are removed.
7.2 RETRIEVING TROUBLE CODES FROM THE COMPUTER
7.2.1 In order to retrieve the trouble codes stored in the computer, a scanner must be connected to the
Assembly Diagnostic Link (DLC) connector (installed and connected in Paragraph 6.2.1). Follow
the instructions provided with the scanner to read the codes set in the computer.
7.2.2 After you have read any codes, write them down for reference. Remove the cover from the DLC
connector.
7.2.3 Take the codes one at a time and match them to the codes in a Corvette factory repair manual or to
the list at the end of this manual. This will tell you what circuit the computer has detected a
problem in.
Note: A code indicates a problem in a specific circuit, NOT THAT A PARTICULAR PART IS
BAD
.
7.2.4 Before taking more extensive corrective actions for any trouble codes make sure that all
connections on the indicated circuit, INCLUDING THE COMPUTER, are clean and tight.
Inspect the wiring in the circuit for any broken, shorted, or exposed wires. Finally, insure all
ground wires are clean and secure.
7.2.5 If a trouble code is detected and the problem has been fixed, clear the codes by first making sure
the ignition is off then disconnecting the NEGATIVE battery cable for at least 3 minutes.
7.3 WHEN TO CALL PAINLESS PERFORMANCE PRODUCTS' TECH LINE
7.3.1 These harness kits have been built with the highest regard to quality control. Before calling us
please double check all connections and perform normal basic trouble-shooting (fuel pressure,
timing, ignition system, etc.).
7.3.2 If you have any questions concerning the installation of this harness or having trouble in general,
feel free to call Painless Performance Products' tech line at [phone]. Calls are answered
from 8am to 5pm central time, Monday thru Friday, except holidays. Email questions to
[e-mail]