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 Accessing Diagnostic Trouble Codes Turn ignition switch to OFF position Locate Data Link Connector (DLC), next to fuse box. Connect voltmeter positive lead to DLC terminal #1 and Negative lead to terminal #12 (ground). Turn Ignition switch to ON position. codes are read out by 12 volt pulses of voltmeter. A constant repetition of short pulses is normal. Signals will appear on voltmeter a long and short 12 volt pulses. long pulses represent tens short pulses represent ones (4 long pulses and 3 short pulses indicates code 43)