Class A RV Frieightliner chassis 3126e CAT turbo 330 engine ; How to trouble shoot code(s) & repair them. 2003 3126e showing code 164 / FM 3 . RPM @ 748. All proceeding readings taken @ idle. ICP gauge @ 0 , Oil pressure @ 27.5 , HPR @ 26 , LOD @ 22 , PSI Barometric pressure @ 14.2 , VLT @ 13.9 - 14.1 Volts during data sample.
Check engine light on. Seems to idle fine with expected sound variant during cylinder cut out test. When test driving under load the RV can barely get out of its own weight. Especially up a slight grade, or from a complete stop. Max MPH is 40-45, but is slow to respond to foot to peddle, or a floored it peddle to the metal scenario. It will shift through all of the Allison's gears. New air filter, fuel/water filter replaced, oil & filter. Along with other routine maintenance are up to date & fluid levels checked. Have also replaced the injector wiring harness & reset (or I tried to reset) / clear the 164/3 code. Upon test drive the RV responded the same as before, with NO noticeable difference.
On original diagnosis of the 164/3 code I did not have the other gauge readings available to me. Now the reading I'm concerned with is the ICP @ 0. I'm more familiar w/ OBDII codes & resets & getting them back to being able to meet testing parameters on gas engines. Usually after driving 45-75 miles or so the OBDII will say the vehicle is ready for testing. Is there a required amount of miles I need to put on my Class A before all the codes are dropped & reset??
If not then, my next part I was wanting to confirm replacing is a GP - pressure sensor / injection actuation pressure sensor CAT part # 194-6726 the updated CAT # is 224-4536 (COO MX Sensor GP)
This may turn out to be a great LOL moment . . . this sensor is one of the original parts that I felt was suspect & wanted to replace 1st prior to all the testing, getting codes, R & R & going down the proverbial rabbit hole. Can anyone tell me from the info I've supplied what might or should be my next step in confirming the next part replacement ? & if I've placed enough miles on the Coach since the injector harness repair & code clear to move on in my seemingly endless journey . . . THX !