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2006 f150 5.4 will crank but will not start The following is what I did to try to resolve this no start issue with no luck 1 I checked that I was getting fuel, it's getting fuel. 2 I checked all injectors for 12 VDC with key in on position, I've got 12 volts. 3 I checked all the COP's for spark with the engine turning over, no spark on any. 4 I checked for voltage on all 8 COP'S connectors, no voltage exist on any coil. 5 I changed the crank position sensor and checked for spark, again no spark or voltage to the COP's. I would appreciate any suggestions what I should do next

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  • Cars & Trucks Master
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Like brad said, but check all the fuse (inside and under the hood) fro the ECM/PCM, also check the fuses the say IGN. Then check for voltage at the crank sensor and the cam sensor. Both are on the same wire. If you have voltage at the cam, them the wire is broke between the cam and crank. If no voltage on either, check voltage at the PCM connector plug. If voltage there then the wire is broke between the PCM and sensors. No voltage, Then your last recourse before replacing the PCM, is to pull the plug, check for corrosion, clean it. But also check for continuity between the pin and a couple of inches up the wire, then up to the sensors. If continuity is good (less than 5 ohms) replace the PCM. Also some thing to check is all the power(B+) and ground points on the pins to the PCM. Sorry I don't have electrical schematics for your vehicle. I would surely pass them on to you if I did. You can get them at alldatadiy.com

Posted on Nov 13, 2014

  • chuck urgitus
    chuck urgitus Nov 13, 2014

    Thank you I will check for voltage at the cam and crank sensor's plus fuses. I have checked all fuses in the fuse block all were good.

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  • Cars & Trucks Master
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IF it is not the crank shaft position sensor, Check the fuse on the ECM

Posted on Nov 13, 2014

  • chuck urgitus
    chuck urgitus Nov 13, 2014

    Is there a separate fuse for the ECM other than in the fuse block under the dash?

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I don't have direct experience with the '06 F150 but you are on the right track. First look for FUSES. Try the local library or repair manual and get a wire diagram. I would print it and use different color markers to trace the primary ignition circuits and their components. PARTICULAR ATTENTION TO THE POWER DELIVERY TO THOSE COILS. Remove any suspect modules and have them tested for free at the local parts store. Look for wire chaffing and poor grounds. Sometimes an IGNITION MODULE, Throttle Position Sensor, etc. I KNOW YOU ARE NOT GETTING SPARK BUT SOME FORD VEHICLES HAVE A DEVICE THAT STOPS THE FUEL PUMP ON REAR IMPACT. I would find the switch and reset it just to eliminate it. BEST OF LUCK!!!!!

Posted on Nov 13, 2014

Testimonial: "Believe it or not it was the number 33 fuse. Had the person check it out and tell me all fuses were good so I double checked and the fuse that goes to the coils 15 amp was blown. Ugh! What a nightmare and such a simple fix. It is running ruff like on one cylinder isnt firing. Ive got to wait till my neighbor gets home to read the codes to tell which one is the problem. I am going to change all the plugs and COP's next month. I hope this will fix everything. Also bought a fuel filter just to because its got 175000 miles."

  • chuck urgitus
    chuck urgitus Nov 13, 2014

    Thank you! I will recheck all fuses and see if I can get a wiring diagram schematic. I will get back to let you know what I found.

  • chuck urgitus
    chuck urgitus Nov 13, 2014

    Thank you! I will recheck all fuses and see if I can get a wiring diagram schematic. I will get back to let you know what I found. Oh I did check the fuel shut off and it's not tripped

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