Compression Ignition Addict
Join Date: Dec 2007
Thanked 237 Times in 228 Posts
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Unpluging the ICP, it will let the PCM set a default pressure for the IPR to run on.
The IPR is a bit trickier, you can't just unplug it. But you can look at it visually to be sure the plug looks good (no insulation missing) and the "tin nut" is still there and holding the coil onto it tightly. Maybe "rap" on it with something to see if you can dislodge a stuck pintle. The IPR can also be disassembled and inspected.
What makes you think it either of those though? It could be Many things, and the most likely, with no WTS light, would be a shorted Fuel Heater and a blown fuse not letting the PCM run. Look into that first, you Should have a WTS light!