If your getting 3500psi when dead headed, and 200 when hooked up, I'd say 1 or more injectors is pissing oil. Pull the valve covers and crank it over.
I know you just replaced the icp
but did you try cranking it over unplugged?
Got this from another website that comes right from the manual
Pressure control in the injector control pressure system is closed loop. It is controlled by the injection pressure regulator (IPR
), the injection control pressure (ICP
) sensor and the strategy in the powertrain control module (PCM
is a pulse-width modulated valve operating at 400 Hz. The pulse width is modulated from a duty cycle of 8 to 50% to control injection control pressure from 3.4-20.7 MPa (500-3000 psi
). The IPR
is mounted in the high pressure pump and achieves injection control pressure regulation by discharging excess oil through a shuttle valve into the front cover and back to sump.
controls the injection pressure regulator (IPR
) by an internal ground switch (low side driver) internal to the PCM
. Pressure control is a variable function of the engine control strategy and the calibration that has been programmed into the PCM
The injection control pressure (ICP
) sensor is mounted on the left cylinder head and is the feedback signal for the closed loop control system. The ICP
sensor is a ceramic disk-type pressure sensor that converts pressure into a 0 to 5 volt analog signal that the PCM
uses to determine injection control pressure. Typical operating range is 0.7 to 3.2 volts.
A spring/piston pop-off valve is installed internal to the high pressure pump and is set to discharge oil pressure into the front cover in the event injection control pressure exceeds 27.6 MPa (4000 psi
If you hook up the scantool, and monitor ICP
) while cranking...you'll see IPR% (duty cycle) climb & climb 15% key on..20, 30, 40, 55%, higher..the increase in IPR% means that the PCM
is requesting ICP
pressure to increase...
so ALSO watch ICP
) and if it comes up to only 180-250psi or so and stays there...then it's the IPR
hung open (bypassing oil back to the oil pan through the front cover) such that only minimal psi
can be made.
If the ICP
is VERY low...like under 60psi...then it could be injector (poppets) pissing oil (under the VC's)..which is typical for injector with more than 180-200k miles.
climbs above 550-600..then it will probably climb much higher (15-1800+) and it is most likely going to be an electrical issue.