No sparks when cranking

Tiny
NORA RAQUEL SAENZ
  • MEMBER
  • 2005 MAZDA 6
  • 2WD
  • AUTOMATIC
  • 235,000 MILES
My car is cranking but not starting. Four cylinder. There is no sparks when turned on. Can anyone help me determine what the problem is?

Thank you in advance.
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Sunday, May 12th, 2019 AT 5:08 PM

13 Replies

Tiny
SCGRANTURISMO
  • EXPERT
Hello,

This could be a problem with your vehicle's Crankshaft Position Sensor (CKP). It is used by your vehicle's Power-train Control Module (PCM) to determine the rotational speed of the crankshaft for ignition timing and misfire monitor. Without this signal the PCM will not fire the spark plugs. I have included a few links for you to go to below:

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

I have also included in the diagrams down below the location of the CKP for your vehicle. Please go through the guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Sunday, May 12th, 2019 AT 6:02 PM
Tiny
NORA RAQUEL SAENZ
  • MEMBER
Thank you for your response. We changed the CKP and it still does not turn on. What else could it be?
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Tuesday, May 14th, 2019 AT 3:54 AM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

Okay, the CKP is good, so let's move on to the Camshaft Position Sensor(CMP). The CMP detects the rotational speed of your vehicle's camshafts for fuel injector timing and to keep track of #1 cylinder, specifically when it's at Top Dead Center(TDC) of the compression stroke. Without the signal from the CMP the PCM in your vehicle will not know when to energize the fuel injectors and your vehicle will not start. I have included a description of the CMP's operation and location in the diagrams down below. Please go through this information and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Tuesday, May 14th, 2019 AT 8:14 AM
Tiny
NORA RAQUEL SAENZ
  • MEMBER
Thank you for your reaponse. The car jas had the alternator changed, the main 100a fuse in the fuse box under the hood because everything eent out on the car. Once ee changed that fuse everything turned on, dashboard lights, signals, stereo, windows, etc except tge car. It will only crank. We then changed the crankshaft position sensor, nothing. Then we changed the coil, nothing. My dad says there is no spark when trying to turn on so there is no energy going thru to give the car enough to turn on. Will the camshaft be the problem? My dad asked another mechanic and he says it could be the computer but the check engine light is on. When he checks why its on it gives him no codes. Should I go ahead and try the camshaft sensor change?
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Thursday, May 16th, 2019 AT 12:43 PM
Tiny
SCGRANTURISMO
  • EXPERT
Yes,

On your vehicle the Camshaft Position Sensor (CMP) is used for the fuel injection and spark timing as per my last answer. I have included in the diagrams down below a description of the CMP for your vehicle. Please go through it and get back to us with what you are able to find out.

Thanks,
Alex
2Carpros
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Thursday, May 16th, 2019 AT 2:37 PM
Tiny
NORA RAQUEL SAENZ
  • MEMBER
Hi, the camshaft sensor did not work. Its still cranking without turning on.

.
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Saturday, May 18th, 2019 AT 3:56 PM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

Okay. I'm also thinking that it is going to be your vehicle's Power-train Control Module (PCM) that is at fault on your vehicle. To be sure though, I have included the Mazda factory Spark Test in the diagrams down below. Please go through it and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Saturday, May 18th, 2019 AT 11:45 PM
Tiny
NORA RAQUEL SAENZ
  • MEMBER
So first I need to follow these steps or go ahead and buy the PCM? Where do I buy this part?
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Thursday, May 23rd, 2019 AT 10:59 AM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

Okay when you turn the key on the "check engine" light comes on and stays on but you can't get a code from the code reader. This does sound like a an internal PCM short, nut lets double check to make sure we're getting power and ground at the Data Link Connector (DLC) just to be sure. I need you to check fuse #11(15A)(Room Fuse) in the Joint Box under the left hand side kick panel and Ground #8 behind the left side of the dash. When checking the fuse make sure that it is clean, tight, corrosion free, and making good metal to metal contact. I have included wiring diagrams, diagrams, and component locations in the diagrams down below. Please get back to us with what you find.
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Thursday, May 23rd, 2019 AT 6:27 PM
Tiny
NORA RAQUEL SAENZ
  • MEMBER
We have changed the PCM and it still doesn't turn on. What next?
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Friday, May 31st, 2019 AT 5:29 AM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

Is your security light blinking?

Thanks,
Alex
2CarPros
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Monday, June 3rd, 2019 AT 6:03 PM
Tiny
NORA RAQUEL SAENZ
  • MEMBER
Yes.
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Thursday, June 6th, 2019 AT 8:56 AM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

Okay, when you guys replaced your PCM, you have to get your ignition keys reprogrammed to the new PCM, or it will not recognize the ignition keys and it will think that somebody is trying to steal your vehicle and turn on the immobilizer. So you have two options; take your new PCM's strategy code and the ignition keys to either the dealership or a locksmith to have the keys reprogrammed to your vehicle's new PCM. These are the only two options available to you for key reprogramming.

Thanks,
Alex
2CarPros
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Friday, June 7th, 2019 AT 9:52 AM

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