Smoky
Full Access Member
Well ive been chasing my cranking no start issue since Saturday. I had Ed repair the FICM the week before and all ran well from Wednesday until Saturday. It was washed and would not start and is still siiting in the driveway. I replaced the cam position sensor on Monday morning thinking that was my problem but still not starting. If you remember from my previous post over the last 6 weeks, I have been working on R&R the egr cooler oil cooler. etc.... and had the batteries out of the truck. The batteries are Bosch 1000/850 amp 96 month batteries. They are now 49 months old. I charged them once or twice while out of the truck. They were load tested individually out of the truck 2 weeks ago at AZ and were said to be OK but needed a litle charge.
Now to tonight; I picked up another loan-a-scanner from AZ as the last one was not working. This time I got a P2285 code which is a ICP sensor code. This was from my unplugging the sensor to see if that made a difference to make it start. Still only cranking no starting. I've checked the voltage on my FICM and it shows 48-50 KOEO and 48-49 cranking. The wiring harness to the FICM is intact and tight to the FICM.
I cleared the P2285 code with the scan tool then tried cranking the engine. No code reappeared so i believe the code was from when I had unplugged the sensor earlier. There was no oil residue on the ICP sensor harness when I unplugged it earlier.
Upon reviewing the data on the scan tool, I noticed that the VPWR voltage when cranking the enginge dropped to about 8 volts and at best was only showing about 11.3-11.9 volts when not cranking and not trying to crank for a while. The scan tool is registering engine RPMS at about 250 when cranking. The batteries were fully charged this afternoon but after about 6 attempts at cranking the engine for about 10 seconds or less each time, the batteries will not sustain a crank over about 3 secs and the lights flicker off and the scantool goes blank on the screen.
I believe that the individual battery load test at AZ lied to me and the batteries are actually failing under load as evidenced by the low voltage during cranking.
What do you guys think?
Now to tonight; I picked up another loan-a-scanner from AZ as the last one was not working. This time I got a P2285 code which is a ICP sensor code. This was from my unplugging the sensor to see if that made a difference to make it start. Still only cranking no starting. I've checked the voltage on my FICM and it shows 48-50 KOEO and 48-49 cranking. The wiring harness to the FICM is intact and tight to the FICM.
I cleared the P2285 code with the scan tool then tried cranking the engine. No code reappeared so i believe the code was from when I had unplugged the sensor earlier. There was no oil residue on the ICP sensor harness when I unplugged it earlier.
Upon reviewing the data on the scan tool, I noticed that the VPWR voltage when cranking the enginge dropped to about 8 volts and at best was only showing about 11.3-11.9 volts when not cranking and not trying to crank for a while. The scan tool is registering engine RPMS at about 250 when cranking. The batteries were fully charged this afternoon but after about 6 attempts at cranking the engine for about 10 seconds or less each time, the batteries will not sustain a crank over about 3 secs and the lights flicker off and the scantool goes blank on the screen.
I believe that the individual battery load test at AZ lied to me and the batteries are actually failing under load as evidenced by the low voltage during cranking.
What do you guys think?
