What is the proper procedure for idle relearn on a 1992 Nissan Maxima cylinder automatic?

There's no single "idle relearn" procedure for a 1992 Nissan Maxima like there is for some later vehicles with computer-controlled throttle bodies. The 1992 Maxima's idle control system is simpler and doesn't require a specific relearn procedure in the way you might find in a later OBD-II equipped car. Instead, the idle speed is primarily controlled by the idle air control (IAC) valve and the throttle position sensor (TPS). Problems with idle are usually addressed by addressing issues with these components or related systems.

If your 1992 Nissan Maxima is experiencing idle problems (rough idle, stalling, high idle), the proper procedure involves troubleshooting, not a specific "relearn." Here's a more accurate approach:

1. Check for Vacuum Leaks: Carefully inspect all vacuum lines connected to the intake manifold, the IAC valve, and the brake booster. Leaks can significantly affect idle. Use a vacuum gauge to check for leaks if you have one.

2. Inspect and Clean the Idle Air Control (IAC) Valve: Locate the IAC valve (often near the throttle body). It's a small, motorized valve. Remove it carefully, clean it with throttle body cleaner (paying close attention not to damage the delicate internal parts), and reinstall it. Make sure it moves freely.

3. Check the Throttle Position Sensor (TPS): A faulty TPS can cause a variety of idle problems. The TPS needs to be correctly calibrated. This often requires a specialized tool to measure its voltage output against throttle plate position and possibly replacement.

4. Inspect the Throttle Body: Clean the throttle body thoroughly with throttle body cleaner. Make sure the throttle plate moves freely and smoothly.

5. Check the Battery Voltage: A low battery voltage can cause erratic idle.

6. Check for Engine Codes (if equipped): While a '92 Maxima may not have a full OBD-II system, it might have a check engine light and some diagnostic capability. If a check engine light is on, have the codes read to diagnose potential problems.

7. Inspect the PCV Valve: A clogged PCV valve can affect the air/fuel mixture and lead to poor idle.

8. Check Air Filter: A clogged air filter restricts airflow and can impact idle.

9. Professional Help: If you've checked all of these things and the idle problem persists, it's best to consult a qualified mechanic. They have the tools and experience to diagnose more complex issues with the fuel injection system, ignition system, or other components that could be affecting your idle.

In short: There's no "idle relearn" button or procedure for this car. Focus on cleaning and checking the components that directly regulate idle speed. The problem is likely a faulty component or a vacuum leak, not a need for re-learning.