Compression Ignition Addict
Join Date: Dec 2007
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OK, first - what are you scanning the truck with? Your IDM isn't bad if you have no codes BUT, you need the right scanner. It takes a special scanner to retrieve those codes and the Genreric OBD-II scanners like the Auto Parts stores use don't do us much good.
Next the IPR regulates the HP-oil that drives the injectors, you should see oil there. Lets start with some No Start basics;
WTS Light? - do you get it when you first roll-on the key?
Tach Movement? - does the tach needle move up slightly when cranking?*
Fuel - pump runs? Fuel refilling filter housing? Tank below 1/4?
Is it cranking fast enough? - it won't even TRY to start if cranking too slowly.
Is your truck "chipped"? If so, remove it as a Test.
*(because your truck is an '01, this may or may not apply to you. Here's how you'll know, IF your Instrument Cluster contains a Trans Temp Gauge the cluster no longer shows cranking rpm on the Tach. IF you DO NOT have that gauge, you SHOULD see the tach needle move up slightly as it turns on the starter. This is a test of the CPS)
Also, you could try disconnecting the plug on the ICP sensor to set a default value for the IPR to run with. Did you check the plug and sheet metal nut going to the IPR? That nut can vibrate off and allow the solenoid going over the valve to slide around. The wires going to the IPR can get brittle, crack, and short together. Make sure the plug & wires look in good shape.