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How to test camshaft position sensor?

How to test camshaft position sensor?

The camshaft position sensor sends information about the combustion cycle to the ECU. This allows the ECU to determine the ignition and injection points so that it can ignite the engine and inject fuel into the cylinder at the correct time. Sometimes, however, the sensor can fail. Want to know the symptoms of failure? You can test it to find out if it is faulty or not.

Camshaft position sensor failure symptoms: symptoms

Camshaft position sensor failure can manifest itself in the following ways:

  • Difficulty starting
  • Engine warning light illuminates
  • Recording a trouble code
  • ECU puts vehicle in degraded mode

Defective camshaft position sensor: cause of failure

The camshaft position sensor can fail for any of the following reasons

  • Mechanical damage
  • Damaged camshaft gear
  • Internal short circuit
  • Interrupted communication with the ECU

How do I test a camshaft position sensor?

Step 1: Locate the camshaft position sensor

Stop the vehicle on a level surface and turn off the engine. Allow the engine to cool for several hours, then open the hood.

To locate the camshaft position sensor, you must first locate the camshaft by accessing the engine.

The camshaft is located near the crankshaft. Once you've located the shaft, you can easily locate the sensor.

Step 2: Check the connection cable

Once you've located the camshaft position sensor, check the condition of the cable that connects the sensor to the ECU by measuring its voltage with an ohmmeter.

To do this, disconnect the sensor and ECU connectors and check that the set value is close to 0 ohms. If the value is too far from 0, the camshaft position sensor is defective. Also check the continuity of the various wires.

Step 3: Check connecting cables for ground shorts

You should also check that there are no short circuits in the wires connecting the camshaft position sensor to the vehicle ground.

Measure the voltage between the vehicle ground and the sensor connector. The ECU connector should be disconnected and the reading should be greater than 30 Mohm. If this is not the case, some of the ground wires may be shorted.

Step 4: Check power supply

Next, plug in the ECU connector and measure the voltage from the engine ECU to the camshaft. Turn on the ignition and wait for the ohmmeter to calculate the voltage. Check that the reading is the same as the one recorded in the vehicle's service record. It's usually about 5 volts. If it's different, there's a voltage problem between the camshaft position sensor and the ECU.

Step 5: Check signal voltage

Connect the ohmmeter test lead and start the engine. The oscilloscope on the ohmmeter display should show the shape of a rectangular signal. If not, there's a problem with the camshaft position sensor.

How do I replace a camshaft position sensor?

Replacing a camshaft position sensor can vary by vehicle model, but here are the general steps for performing this operation:

Step 1: Make sure the engine is cold and the vehicle is properly secured with the parking brake applied.

Step 2: Locate the sensor. Identify the specific location of the camshaft position sensor on your engine. It's usually close to your cam.

Step 3: Disconnect the battery. Disconnect the negative battery cable to prevent shorting during operation.

Step 4: Disconnect the electrical connectors from the faulty camshaft position sensor.

Step 5: Remove the defective sensor: Use a suitable wrench or socket to remove the screws or bolts holding the sensor in place. Carefully remove the sensor from its location.

Step 6: Clean. Take this opportunity to clean the area around the camshaft position sensor. Remove any dirt, debris, or residue.

Step 7: Install new sensor. Tighten the mounting screws or bolts and insert the new camshaft position sensor into the appropriate slot.

Step 8: Reconnect the electrical connections.

Step 9: Reconnect the negative battery lead and make sure it's tight.

Step 10: Verify: Turn on the ignition and verify that the engine light goes out.

Step 11: Start the engine and make sure it runs normally.

Step 12: Take a test drive to make sure the new camshaft position sensor solves the initial problems.

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