Painless Performance 60505 - Manual (Page 18)

7.1 THE "CHECK ENGINE" LIGHT
Normally, the "check engine" light should come on when the ignition is turned on, 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.
7.2 RETRIEVING TROUBLE CODES FROM THE COMPUTER
The chart below shows the type of ALDL test connector each vehicle came with from the
factory. If you are using a computer with ’94 Camaro/Firebird, ’94-’95 Caprice or ’95
Impala programming you must obtain a OBD 1 connector. We will provide this
connector at no charge by calling our tech line at 800-423-9696. Ask for part number
WH-365.
1994 1995 1996
Camaro OBD 1 OBD 11 OBD 11
Firebird OBD 1 OBD 11 OBD 11
Caprice OBD 1 OBD 1 OBD 11
Impala --------- OBD 1 OBD 11
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 connector from the
DLC connector.
7.2.3 Take the codes one at a time and match them to the codes in Table7.1. This will tell you in which
circuit the computer has detected a problem.
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.
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FIGURE 7.1 Fuse Identification