P0201 even after replacing injector, plugs, coil pack

Hi Everyone, I'm having a P0201 issue on my rig. I've replaced the following parts (injector, injector harness, coil pack, spark plugs and spark plug wires), and still have the same issue. Any help or guide are greatly appreciated. TIA

 

No, sir. I'm looking for any recommendation before tackling it again.

 

Since you replaced the injector, injector harness, coil pack, spark plugs and spark plug wires, did you ensure that you have a secured ground connection? And clear all codes afterwards? Ensure key wasn't on while replacing set parts? I only ask that question from back when I first started mechanics. You live and you learn!

If you've determined that the injector for cylinder 1 is not receiving power, here are a few suggestions for further investigation:

1. Check the injector fuse: Locate the fuse box and find the fuse responsible for the injectors. It's possible that the fuse may be blown or loose, causing a lack of power to the specific injector. Replace or reseat the fuse as needed.

2. Test the injector circuit wiring: Use a multimeter to check for continuity along the wiring harness from the injector connector to the engine control module (ECM). Ensure that the wiring is intact and not damaged. Pay close attention to any connectors or junction points, as these can sometimes become corroded or loose.

3. Inspect the ECM: Although rare, it's possible that the issue lies with the ECM itself. Check for any signs of damage or corrosion on the ECM's connectors. If possible, try swapping the ECM with a known working unit to see if the problem persists.

4. Consider an intermittent issue: If all wiring and connections appear to be in order, it's possible that there is an intermittent fault that is difficult to detect. Keep an eye out for any patterns or specific conditions under which the injector may fail to receive power.

The ASD power supply to injectors is spliced to all 6 injectors in the plastic channel right by all the injectors. The PCM pulses a ground signal to fire each injector.

Then there is this possibility:
Send the PCM off to wranglerfix.com. They have identified this problem before as: replaced injector number one circuit driver inside the PCM. Once reinstalled and clear all codes prior to turning over vehicle. Do be advised that this is a last resort if all else fails!

 

Hi Mack,

Thank you for your reply. I will try to tackle this again this weekend and will check for your recommendation as well as checking the valve springs to make sure they are not broken.