Crank no start with multiple codes?

2004 FORD EXPLORER
150,000 MILES • 4.0L • V6 • 2WD • AUTOMATIC
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ADAMLANM
I have no spark coming from the coil pack. i check with my spark tester, and I put my scan tool on vehicle and got multiple codes popping up on my vehicle listed above. The codes are p0122, p0183, p0193, p0223, p0403, p0406, p2104, and p2110 and it is not a flex fuel vehicle.
Dec 15, 2024 at 9:55 AM
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AL514
  • ASE Certified Mechanic
  • 5,541 POSTS
  • ASE Certified Mechanic
Hello, with so many codes like this, I would start by checking the 5v Reference and the Grounds to Fuel rail pressure sensor and to the Throttle position sensor on the throttle body, The fuel rail pressure/temp sensor shares a 5v ref with the EGR control and also probably shares it with the TPS internally to the ECM and the Grounds are going to be shared internally as well on the Sig Return wire, I would think the forced idle for the throttle actuator and limited rpm are a result of the TPS codes, Ill post some wiring diagrams for you, but with the key On, you should read 5 volts on at least 1 wire for the TPS, EGR, and Fuel Rail pressure sensor. I'll have to look over the diagrams on the OEM side to be sure these colors are correct,
but something else to keep in mind is if one of these sensors is shorted to ground it can affect the other sensors that use the same 5v ref feed. So, if you unplug the sensor to check a 5v ref and it's the faulty sensor, it will appear normal because it's no longer shorted to ground unplugged. So back probing these sensors with a pin is best, then if you see a missing 5v ref you can then unplug other sensors to see if it returns.
Dec 15, 2024 at 11:57 AM
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AL514
  • ASE Certified Mechanic
  • 5,541 POSTS
  • ASE Certified Mechanic
Anything labelled VREF should read 5-volts steady with the key On. The Sig Return is the sensors Ground and is shared by the Oxygen sensors as well. Also check the PCM grounds G104 and G105 they should be black/white wires that bolt to the body near the PCM, it looks like they are all at that one location, so I would verify the engine and body grounds as well using a test light.
Dec 15, 2024 at 12:20 PM
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