Ways to Study Codes Without a Scan Tool on a 1994 GM 1Turn off your GM's engine. Locate the black rectangular shaped diagnostic connector, which underneath the driver's side dashboard panel close to the floorboard.2Bend a small metal paperclip into a "U" shape Professional diagnositic tools. Insert the pointed ends in to the furthest two top-right diagnostic connector terminals.
Just after bridging the two prime suitable terminal connections on the diagnostic connector, switch the ignition to the "ON" position.3Watch the "Check Engine" light in your dashboard. It must flash the moment, pause, and flash two far more times in succession. The "one flash followed by two flash" code will happen a total of 3 instances ahead of the pc displays the difficulty codes stored inside the computer's memory.4Write down the sequence of flashes displayed from the "Check Engine" light following the initial "one flash, pause, two-flash" code appears three times.
The remaining trouble codes will flash a total of 3 occasions before displaying the next set of difficulty codes. After the pc displays all of the difficulty codes, the "Check Engine" light will repeat the sequence, beginning with all the "one flash, pause, two-flash" code.5Turn off the ignition switch. Get rid of the paper clip from the diagnostic connector. Translate the number of flashes for each sequence into the appropriate two-digit GM trouble code car diagnostic software. For example; if one particular flash sequence flashes three occasions, pauses then flashes 4 times, the sequence will be regarded as difficulty code "34."6Research every from the difficulty codes you wrote down to find out information with regards to the elements affected (see Resources).
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