Engine Electrical Problem
 

2002 Voyager, 3.3 MFI ,182k miles : Car started stalling ( luckily close to home ), got codes p0123, p0118, and p1193. All indicate a high input, so I suspected a wiring harness issue. I started with the MAP sensor wiring (since Chilton's manual showed a common ground). Got to the fuel injector harness connector, and all the insulation just fell apart. Most of the insulation just fell off all the wires for the first 5 inches or so. Saw that this is a common problem, and I replaced the harness. Figured for sure the problem was fixed, but nope, same problems continued. While doing more troubleshooting, and unplugging more connectors with both key on 'run' , and 'off', I found there was still a supply voltage at MAP sensor with both PCM connectors unplugged! According to the wiring diagram, this should not be happening since the +5V for the sensors comes from the PCM. More troubleshooting, and I discover that the voltage is coming from the IPM ( the plug with the yellow base). Even more perplexing is that 5V stays for exactly 10 minutes AFTER the key is turned off , and then goes to 0V. Anyone ever encounter this before? Also any good online links for the exact wiring diagram for this model? I figure it's probably still a harness issue, but would appreciate any pointers before starting to pull the whole harness apart. Thanks in advance to all!

fuel injector wire harness look near the back of the back cylinder head below the power steering fill point there is a 30 someway connector it likes to get oil on there and degrade the wires so they touch each other.