Editing Z31/SENSORS/airreg php (section)

=== Troubleshooting ===

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Disconnect the ECCS 20-pin connector and check voltage between Pin 16 and ground with ignition ON. You should see battery voltage at this point.

* If you do not have battery voltage, check the wiring harness for breaks or corrosion.
* If these tests check out okay, continue to check the air regulator for operation.
* Check for continuity between both pins on the air regulator. If there is no continuity, the air regulator is faulty—replace it.
* Remove the air regulator and visually inspect shutter movement. When the engine is cold, the shutter should be open; when warm, the shutter should close.
* Carefully pry open the shutter to check for smooth movement.
* If any of these tests fail, replace the air regulator.
* Finally, check for any vacuum leaks. The regulator uses an O-ring seal at the manifold and has a vacuum line running to the rear hard lines on the upper plenum. These rubber lines can crack over 30+ years and cause vacuum leaks—replace any lines that show signs of cracking.

[[Category:Imported from Xenonzcar]]