[SOLVED] P3494 Code: Fixing Cylinder 12 Exhaust Valve Control Circuit

The P3494 fault code in automobiles indicates a problem with the Cylinder Deactivation Solenoid. The symptom is the Engine Light ON or Service Engine Soon Warning Light.

The cause could be low oil pressure, restricted oil passage, engine mechanical condition, faulty Cylinder Deactivation Solenoid, Cylinder Deactivation Solenoid harness is open or shorted, or Cylinder Deactivation Solenoid circuit poor electrical connection. The repair importance is high as it affects the engine’s performance. The repair difficulty is moderate, and the fix involves visually inspecting the related wiring harness and connectors, checking for damaged components, and looking for broken, bent, pushed out, or corroded connector’s pins.

The repair time is estimated to be 1.0 hour.

It is essential to check the possible causes listed above to interpret the fault code accurately.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

If you see the Engine Light ON or Service Engine Soon Warning Light, it could be due to the p3494 fault code.

Here are the symptoms to look out for:

  • The P3494 fault code in an automobile can cause the following symptoms: Engine Light ON, Service Engine Soon Warning Light ON, engine misfire, rough engine idle, reduced engine power, poor acceleration, and increased fuel consumption.
  • It is important to address these symptoms promptly to avoid further damage to the vehicle.

The automobile fault code P3494 can be caused by a variety of factors, including low oil pressure and faulty solenoids.

  • The automobile fault code P3494 can be caused by low oil pressure, restricted oil passage, engine mechanical condition, faulty Cylinder Deactivation Solenoid, Cylinder Deactivation Solenoid harness being open or shorted, and Cylinder Deactivation Solenoid circuit having poor electrical connection.
  • It is important to identify the specific cause of the fault code in order to properly diagnose and fix the issue.

Below are the possible fixes for the automobile fault code p3494, including inspecting wiring harness and connectors for damage or corrosion.

  • To fix the automobile fault code p3494, first, check the possible causes listed above.
  • Then, visually inspect the related wiring harness and connectors.
  • Look for any damaged components and check for broken, bent, pushed out, or corroded connector’s pins.
  • This fix will take an estimated repair time of 1.0 hour.

The automobile fault code P3494 can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of repair is influenced by the repair time, which is commonly charged between $75 and $150 per hour by most auto repair shops.

Therefore, the total cost of fixing the P3494 fault code will depend on the hourly rate charged by the repair shop and the estimated repair time required to fix the issue.

The P3494 code is related to the cylinder deactivation system in the engine. The system deactivates certain cylinders to improve fuel economy. The ECM commands the deactivation of cylinders 1, 4, 6, and 7.

The deactivation is achieved by not allowing the intake and exhaust valves to open on the selected cylinders. The deactivation lifters contain spring-loaded locking pins that connect the internal pin housing of the lifter to the outer housing.

The locking pins are pushed inward with engine oil pressure directed from the valve lifter oil manifold (VLOM) assembly solenoids.

The switching between V8 and V4 mode is accomplished in less than 250 milliseconds.

What are the possible causes of the P3494 automobile fault code?

If you see the Engine Light ON or Service Engine Soon Warning Light, it could be due to the P3494 fault code. This code can be caused by low oil pressure, restricted oil passage, engine mechanical condition, faulty Cylinder Deactivation Solenoid, Cylinder Deactivation Solenoid harness being open or shorted, or Cylinder Deactivation Solenoid circuit having a poor electrical connection. To fix this issue, check the possible causes listed above, visually inspect the related wiring harness and connectors, and look for damaged components and broken, bent, pushed out, or corroded connector’s pins.

How can I visually inspect the related wiring harness and connectors to fix the P3494 fault code?

If you’re experiencing the P3494 fault code, start by checking the possible causes listed above. To visually inspect the related wiring harness and connectors, look for damaged components and check for broken, bent, pushed out, or corroded connector’s pins. This will help you identify any issues with the Cylinder Deactivation Solenoid harness and circuit connections.

What are the potential consequences of ignoring the P3494 fault code?

Ignoring the P3494 fault code, which indicates a problem with the Cylinder Deactivation Solenoid, can lead to serious consequences such as reduced fuel efficiency, engine damage, and even engine failure. It is important to address the issue promptly by checking the possible causes, visually inspecting the wiring harness and connectors, and looking for damaged components or corroded pins.

p3494 error fault code explained

If you see the Engine Light ON or Service Engine Soon Warning Light, it could be due to low oil pressure, restricted oil passage, or a faulty Cylinder Deactivation Solenoid. Check the possible causes listed above, visually inspect the wiring harness and connectors, and look for damaged components or corroded pins.

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