Turns over but no spark?

2003 MAZDA PROTEGE

145,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC

PHILLYRICAN001

MEMBER
2 POSTS

Changed spark plugs, wires, coils, checked fuses, relays, fuel pump works (can hear it power when key turned), read wires to coils, cam switch, capacitor, crankshaft position sensor. Any other ideas other than the computer?

Aug 20, 2022 at 7:46 AM

STRAILER

✓ASE Certified Mechanic
54,837 POSTS

Are there any codes? This guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, unplug the injectors and Oxygen sensors to see if the spark comes back, if one of these is shorted it will stop the PCM from triggering the coils. Also check the Meter and engine fuse. Here are the engine wiring diagrams so you can see how the system works and check for good power and ground. If everything checks out, you may have a bad PCM.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

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Professional Diagram for 2CarPros Members
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Aug 20, 2022 at 3:50 PM

PHILLYRICAN001

MEMBER
2 POSTS

After checking all the above, I noticed the timing belt/chain was not turning. I replaced it and now works fine!

Jul 13, 2023 at 10:12 AM

STRAILER

✓ASE Certified Mechanic
54,837 POSTS

Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.

Jul 14, 2023 at 8:39 AM