P1131 NISSAN Possible Causes
- Faulty swirl control valve control solenoid valve
- Swirl control valve control solenoid valve circuit open or shorted
- Swirl control valve circuit open or shorted
- Faulty swirl control valve
- Faulty swirl control valve actuator
How to Fix NISSAN Code P1131?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
When is the Code Detected?
The P1131 code is detected when an incorrect voltage signal is sent to the Engine Control Module (ECM) via the swirl control valve control solenoid valve.
Possible Symptoms
- Check Engine Light On (or Service Engine Soon Warning Light)
P1131 NISSAN Meaning
This system has a swirl control valve in the intake passage of each cylinder.
At idle and during low engine speed operation, the swirl control valve closes. This increases the air speed in the intake passage, promoting fuel vaporization and creating a swirl in the combustion chamber.
Due to this operation, this system tends to increase the combustion speed of the gas mixture, improve fuel consumption, and enhance stability under operating conditions.
Additionally, except at idle and during low engine speed operation, this system opens the swirl control valve. In this condition, the system tends to increase power by improving intake efficiency through the reduction of intake flow resistance.
The solenoid valve controls the closed/open condition of the swirl control valve. This solenoid valve is operated by the Engine Control Module (ECM).
The swirl control valve control solenoid valve responds to signals from the ECM. When the ECM sends an ON signal (ground), the solenoid valve is bypassed to apply intake manifold vacuum to the swirl control valve actuator. This operation closes the swirl control valve. When the ECM sends an OFF signal, the vacuum signal is cut off and the swirl control valve opens.