This one has me stumped. A little background. The truck is my brothers 1997 F350 with 120,000 mi. Truck is bone stock with the exception it is the "roll a long" package. While driving the truck died and a
cel came on. He was unable to start it so had it towed home. Once home the
cel was no longer lit but I scanned it for codes and P1283
IPR circuit came up. However given the symptoms I was inclined to check the
CPS first. Tried his cheap aftermarket one and no change. I then replaced it with a brand new OEM sensor, still no start, no smoke from tail pipe.
Moving on I checked ucvh and they checked out ok. checked
ipr pigtail and found it questionable so I replaced it. Tried unplugging the
icp with no change. Replaced
ipr with oem replacement still no change. Fuses were checked and looked ok. As a last resort we pulled the
pcm and had it checked. It was returned stating it tested fine. Also did a buzz test on the injectors and all passed.
Hpop reservoir is full
While cranking the highest
hpop reading was 199.5.
Ipr duty cycle started at 14.7 but rose to 64.2.
Icp 20.52
psi. This is what I found curious and hopefully means something to someone out there. His batteries are only showing 11.5 v reading at the
pcm. the batteries have been charged and reading 12.5 at the batteries and anywhere else I could get a volt meter on. Even swapping batteries still only showed 11.5 v at the
pcm.
I know this is long winded but I hope my attempt to be thorough might give someone an idea that I missed. Thanks in advance for everyone's help.