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Pull the carpet up on the passenger footwell, and remove the wooden floorboard. underneath is the ECU. Switch the ignition to on, but do not have the car running, use a screwdriver to first turn the screw on the ecu counter clockwise, leave it fully turned for five seconds, then turn fully clockwise, you are now in diagnostic mode. the red LED on the side of the ECU will flash, giving you trouble codes. the long flashes are the first digit, and the short flashes the second. so if it flashes 3 times long, then 4 short, your code is 34.... you don't want a 34. Google for code meanings.

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Q: Where to look for engine codes for 90 300zx?
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