Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Mazda 6 L4-2.5LFACTORY OEM SERVICE PROCEDURE
Crankshaft Position Sensor: Service and Repair
CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [MZR 2.5]
Removal
1. Disconnect the negative battery cable. Removal and Replacement
2. Perform the following procedure for easier access.
a. Remove the aerodynamic under cover No.2. Aerodynamic Under Cover No. 2 Removal/Installation
b. Remove the splash shield. Service and Repair
3. Disconnect the CKP sensor connector.
4. Remove the CKP sensor.
Installation
CAUTION:
- When foreign material such as an iron chip is on the CKP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect the engine control. Be sure there is no foreign material on the CKP sensor when replacing.
- Do not assemble the crankshaft position sensor or change the installation position using any method other than the following. Otherwise, it could negatively affect engine controls, such as the ignition timing and fuel injection.
1. Perform the following procedure so that cylinder No.1 is at TDC.
a. Remove the wheel and tire (front right side).
b. Disconnect the drive shaft (RH) from joint shaft, set the drive shaft (RH) out of the way. (ATX) Drive Shaft Removal/Installation
c. Remove the cylinder block lower blind plug and install the SST.
d. Rotate the crankshaft pulley clockwise until the crank weight contacts the SST so that cylinder No.1 is at TDC.
2. Fit the center of the CKP sensor with the fifth tooth (counting counterclockwise from the empty space A as shown in the figure) of the pulse wheel.
3. Align the center line of the CKP sensor and the line drawn in Step 2, then install the sensor.
4. Install the CKP sensor fitting bolts.
5. Remove the SST then install the cylinder block lower blind plug.
6. Install the drive shaft (RH). (ATX) Drive Shaft Removal/Installation
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.