Quick summary
- The CPS is a vital component of the engine management system that monitors the position of the camshaft and sends this information to the engine control module (ECM).
- The CPS is typically located on the front of the engine, near the top of the valve cover.
- However, if you experience any of the symptoms listed above, it is a good idea to have the CPS checked and replaced if necessary.
If your 2012 GMC Terrain is experiencing rough idling, stalling, or poor fuel economy, it could be a sign that the camshaft position sensor (CPS) needs to be replaced. The CPS is a vital component of the engine management system that monitors the position of the camshaft and sends this information to the engine control module (ECM). This data is used to control the timing of the ignition and fuel injection systems. Replacing the CPS is a relatively straightforward task that can be completed in about an hour with the right tools and knowledge.
Tools and Materials You’ll Need
- New camshaft position sensor
- 10mm socket wrench
- 13mm socket wrench
- Torque wrench
- Flathead screwdriver
- Rags or paper towels
Safety Precautions
Before starting any work on your vehicle, always disconnect the negative terminal of the battery to prevent electrical shock or damage to the electronic components.
Step-by-Step Instructions
#1. Locate the Camshaft Position Sensor
The CPS is typically located on the front of the engine, near the top of the valve cover. It is usually held in place by two bolts.
#2. Disconnect the Electrical Connector
Use a flathead screwdriver to gently pry the electrical connector off the CPS.
#3. Remove the Mounting Bolts
Use a 10mm socket wrench to remove the two mounting bolts that hold the CPS in place.
#4. Remove the Old CPS
Once the mounting bolts are removed, you can pull the old CPS straight out of its mounting hole.
#5. Install the New CPS
Insert the new CPS into the mounting hole and hand-tighten the mounting bolts.
#6. Torque the Mounting Bolts
Use a torque wrench to tighten the mounting bolts to the specified torque, which is typically around 10 ft-lbs.
#7. Reconnect the Electrical Connector
Push the electrical connector back onto the CPS until it clicks into place.
#8. Reconnect the Battery
Reconnect the negative terminal of the battery to restore power to the vehicle.
#9. Start the Engine and Check for Leaks
Start the engine and let it run for a few minutes to check for any leaks. If there are no leaks, you have successfully replaced the camshaft position sensor.
Troubleshooting Tips
- If the engine does not start after replacing the CPS, check the electrical connections to make sure they are secure.
- If the engine still runs rough or stalls after replacing the CPS, there may be another issue with the engine management system. You may need to have the vehicle diagnosed by a qualified mechanic.
FAQs
Q: What are the symptoms of a bad camshaft position sensor?
A: Symptoms of a bad CPS can include rough idling, stalling, poor fuel economy, and difficulty starting the engine.
Q: How often should I replace the camshaft position sensor?
A: The CPS is typically a long-lasting component that does not need to be replaced regularly. However, if you experience any of the symptoms listed above, it is a good idea to have the CPS checked and replaced if necessary.
Q: Can I replace the camshaft position sensor myself?
A: Yes, replacing the CPS is a relatively straightforward task that can be completed in about an hour with the right tools and knowledge. However, if you are not comfortable working on your vehicle, it is best to have the work done by a qualified mechanic.