Engine-Codes - Nissan - P1138 NISSAN

P1138 NISSAN - Swirl Control Valve Control System Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1138 NISSAN Possible Causes

  • Faulty Swirl Control Valve Control Position Sensor
  • Swirl Control Valve Control Position Sensor harness is open or shorted
  • Swirl Control Valve Control Position Sensor circuit poor electrical connection
  • Faulty Swirl Control Valve

How is the P1138 NISSAN code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1138 NISSAN code

Labor: 1.0

The cost to diagnose the P1138 NISSAN code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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When is the code detected?

The P1138 code is detected when the target opening angle of swirl control valve controlled by Engine Control Module (ECM) and the input signal from swirl control valve position sensor is not in the normal rang.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1138 NISSAN Meaning

While idling and during low engine coolant temperature, the swirl control valve closes, Thus the velocity of the air in the intake passage increases, promoting the vaporization of the fuel and producing a swirl in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel consumption, and increase the stability in running conditions.
Also, except when idling and during low engine coolant temperature, this system opens the swirl control valve.
In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow resistance, intake flow.
The swirl control valve is operated by the Engine Control Module (ECM).

More Information

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Information for specific Nissan models

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