Mazda Crankshaft Position Sensor Troubleshooting Guide

A problem that many Mazda owners may face is the crankshaft position sensor failing. If the crank sensor fails on your Mazda, your car will refuse to start or will start intermittently.

A Mazda crankshaft position sensor (CPS) monitors the position and rotation speed of the crankshaft on your Mazda engine.

It is installed on all Mazda vehicles including, Mazda 3, 5, 6, CX5, CX7, CX9. 

Symptoms 

Common symptoms of bad Mazda crankshaft position sensor include:

  • Mazda won't start
  • Intermittent Starting 
  • Check Engine Light On
  • Mazda cranks but won't start
  • DTC Codes P0335, P0017, P0016

These symptoms may be intermittent in some cases. That's why it makes it hard to diagnose a bad crankshaft position sensor especially if the check engine light has not turned on.  

Follow these steps to change the crankshaft position sensor on a Mazda. 

You will need

Instructions

  1. Park your Mazda on level ground. Engage parking brakes. Let the engine cool down. 
  2. Jack up the front right (passenger) side wheel. The CPS sensor is located on the same side that you have the serpentine belt. It is not on the transmission side. mazda 3 6 crankshaft position sensor location

     

  3. Remove the front wheel. Make sure to secure your vehicle with a good set of jack stands and block a tire as well so your car doesn't roll. mazda crankshaft position sensor location

     

  4. Remove the plastic wheel well liner. It is held in place with several plastic clips, 8mm nut, or 10 mm nuts depending on Mazda model. 
  5. Locate the crankshaft position sensor. 
  6. Unplug the electrical connector. replace crankshaft position sensor on mazda

     

  7. Remove two 8mm bolts.replace mazda cps sensor by removing two 8mm bolts 
  8. Before you remove old crankshaft position sensor mark the exact position of the old sensor with a marker. You need to install the new CPS sensor in the exact same location. crankshaft position sensor replacement mazda 3 5 6 cx5 cx7 cx9

     

  9. Install new crankshaft position sensor on your Mazda engine block. Notice that the mounting holes are not round but oval. This allows the sensor to be moved slightly. 
  10. Before you tighten the screws make sure that the new sensor is in the same location as the old. 

Notes

  • Use the bolt in the center of the crankshaft to turn the engine until cylinder 1 hits Top Dead Center (TDC) on the compression stroke.how to adjust mazda crankshaft position sensor

     

  • You will need to align the fifth tooth to the center of the sensor magnetic tip. mazda cps replacement diy cost

     

  • Check with your Mazda dealer as these instructions may vary between different 2.0, 2.3, 2.5 Mazda engine sizes. 

Related Problems

Fuel Pump

  • If your Mazda is not starting it is possible that the fuel pump has failed or is not generating enough pressure. 

Ignition System

  • Spark plugs and ignition coils can also be effective and could be another reason why your Mazda does not start. 

Comments

JOHN VECCHIONE, 2019-03-28

I PURCHASED A 2003 MAZDA 3 WITH A 3.0L IN IT. THE SELLER TOLD ME THE ENGINE CODE WAS FOR A CAM SENSOR. I BOUGHT THE CAR AND FOUND THAT THE ENGINE HAS BEEN REPLACED WITH A NEWER YEAR ENGINE. THE PROBLEM IS THAT THE NEW ENGINE HAS ONLY ONE CAM SENSOR. THE 2003 CAME WITH TWO CAM SENSORS. HOW DO I WIRE IT?

Nelson Candelario, 2019-06-27

My 02 mazda 626 lx won't start ...got spark..interesting. No power at crank position sensor got ground .ck fuses and relays are good ..i even put the ecm opened nothing burned..vehicle has 141000 miles

By YOUCANIC on May 15, 2019

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