Post by
loystock »
https://forums.nicoclub.com/loystock-u10145.html
Wed Mar 03, 2010 5:10 pm
You are lucky that Smog check in NJ is not as comprehensive as that in CA. In CA, there is no way that a car will pass a Smog check immediately after resetting the CEL since internally, the ECM has to perform the SRT (System Readiness Test) which involves driving a highway speed, then stop and go driving. At times, it may take a week for the SRT to be completed, unless user knows exactly what is involved.
As for the problem, the P1165 means the Vacuum Pressure Switch related to the Swirl Control valve is not detecting correct vacuum level when the ECM commands the Swirl Control Valve (SCV) to close. The Swirl Control valve is in each cylinder intake and when close, speeds up airflow to improve fuel atomization for better fuel consumption. The SCV is open when the the engine is at Idle or when below 3200 RPM, provided the coolant temperature is from 50-122F. The SCVs are closed at high engine speed (>3200RPM) or high temp (>131F) or very low temp <50F).
In essence, when the speed and temperature conditions are met, the SCV Control Solenoid Valve is energized (ground to solenoid is provided by ECM) allowing vacuum to be applied to the SCV actuator to CLOSE the SCV. At this time, the Vacuum Pressure Switch should detect the presence of vacuum and sends the status (OFF signal) to the ECM. So when the ECM detects an ON signal (instead of OFF) when the SCV should be CLOSEDtriggers the fault code P1165.
Since you have had P1130 (problem with Control Solenoid Valve) and P1165 (Vacuum Pressure Switch), most likely, you have clogged/restricted/cracked/leaking lines to the SCV actuator. The best thing you can do is to check and clean the lines to the solenoid valve, vacuum switch and SCV actuator. The Vacuum Switch is mounted adjacent to the Throttle Valve Lever. Take note of the tubing location and then disconnect them for cleaning. Check for cracked or blocked tubing.