LED won’t turn off? This could mean the potentiometer is already moved to Mode II or partway in-between, or the car is running. Wait 3 seconds with it in this position, then turn it all the way to the left (counterclockwise). Don’t over-turn it, it doesn’t take much effort to turn at all, and the light will turn off.Į. Turn the potentiometer on the ECU all the way to the right (clockwise). Turn the key to the “ON” position (don’t start it).ĭ. Remove the four 10mm bolts holding the wooden ECU cover down, and remove the wooden cover.Ĭ. Pull back the carpet in front of the passenger seat from the top (closest to the dash). Here’s how to enter diagnostics mode directly at the ECU:Ī. Mode I (all the way counter-clockwise) is normal operation. The dial has two positions: Mode I and Mode II. Next to it is a small dial with a slot called a potentiometer. On the ECU itself is a red LED diagnostics mode light. ECU Diagnostics Potentiometer (LED and CEL): The first thing you need to do is check which, if any codes, are being thrown by your ECU. This guide will explain how to check, solve, and clear diagnostics codes on your Z32. Whenever you get a Check Engine Light (CEL) or your car is acting funny, the first thing you should do is run codes. The Ultimate Guide to Z32 Self-Diagnostics This message has been viewed 72844 times.
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