cant get truck right and it is driving me nuts. Truck feels like it is starving for fuel real jerky. and also throws a p0148 everytime I drive it and clear it. fuel pressure doesnt go below 10 wot and idles around 18 cruise at 15. Cant tell on rail pressure as Di pricol told me to disconnect till they send new harness out as it cant monitor correctly as of now with dual cp3's as it cant process all the information. also when I come to a stop sometimes truck wont idle down and I have to throw into nuetral.

 

P0148-HIGH PRESSURE COMMON RAIL (HPCR) CHECKSUM
For a complete wiring diagram Refer to Section 8W.

When Monitored:
While the engine is running.

Set Condition:
A deviation between the fuel pressure set point and the actual fuel pressure.

Possible Causes
OTHERS DTC'S PRESENT
FUEL LEAKS
FUEL CONTROL ACTUATOR
FUEL PRESSURE SENSOR
CASCADE OVERFLOW VALVE
CHECK VALVE DAMAGED OR BLOCKED
FUEL RETURN LINES OBSTRUCTION, DAMAGE, OR DEBRIS
LIFT PUMP FLOW
AIR IN FUEL SYSTEM
LEAKING FUEL INJECTORS OR HIGH PRESSURE CONNECTORS
PRESSURE LIMITING VALVE
HIGH PRESSURE FUEL PUMP
INTERMITTENT CONDITION


Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)




Diagnostic Test
1. OTHERS DTC'S PRESENT

--------------------------------------------------------------------------------

With the scan tool, read DTCs.

Are any other DTC's present?

Yes
Repair other DTC's first.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No
Go To2


2. FUEL LEAKS

--------------------------------------------------------------------------------

Ensure that the fuel level is above 15% using the scan tool.
Visually inspect the low and high pressure side of the fuel system for fuel leaks or damaged components.

Do you have any fuel leaks or damaged components?

Yes
Repair the fuel leak.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No
Go To3


3. FUEL CONTROL ACTUATOR

--------------------------------------------------------------------------------

Check for a mechanically stuck Fuel Control Actuator (FCA). Using the scan tool, actuate the fuel control actuator.

note: The fuel control actuator will only click when cycled off..



Do you hear a click from the actuator when you cycle the actuator off with the scan tool?

Yes
Go To4

No
Replace the fuel control actuator.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)


4. FUEL PRESSURE SENSOR

--------------------------------------------------------------------------------

Using the scan tool, monitor the fuel pressure reading from the fuel rail pressure sensor at idle and at 2000 RPM

Is the fuel rail pressure reading higher at 2000 RPM than at idle?

Yes
Go To5

No
Replace the fuel pressure sensor.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)


5. HIGH FUEL PRESSURE

--------------------------------------------------------------------------------

Using the scan tool compare the fuel rail pressure set point with the actual fuel rail pressure.

Is the actual fuel rail pressure higher than the fuel rail pressure set point?

Yes
Go To6

No
Go To9


6. CASCADE OVERFLOW VALVE

--------------------------------------------------------------------------------

Perform the no trouble code test "*fuel pump return flow test" .(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Did the fuel injection pump pass the test?

Yes
Go To7

No
Replace the Fuel pump.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)


7. CHECK VALVE DAMAGED OR BLOCKED

--------------------------------------------------------------------------------

Check the fuel drain line check valve in the rear of the cylinder head for signs of damage, blockage, or debris.

Is the check valve damaged or blocked?

Yes
Repair the cause of the damaged or blocked check valve or replace the valve.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No
Go To8


8. FUEL RETURN LINE OBSTRUCTION, DAMAGED OR DEBRIS

--------------------------------------------------------------------------------

Check the fuel return lines for signs of obstruction, damage, or debris.

Are the fuel drain lines damaged or blocked?

Yes
Repair cause of high fuel drain line restriction.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No
Go To9


9. LIFT PUMP FLOW

--------------------------------------------------------------------------------

Perform the no trouble code "*LIFT PUMP FLOW TEST". (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Did the Lift pump pass the test?

Yes
Go To10

No
Replace the Lift Pump.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)


10. PRESSURE LIMITING VALVE

--------------------------------------------------------------------------------

Perform the no trouble code test "*PRESSURE LIMITING VALVE ON THE FUEL RAIL FOR INTERNAL LEAKS".

Did the pressure limiting valve pass the test procedure?

Yes
Go To11

No
Replace the Pressure Limiting Valve.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)


11. LEAKING FUEL INJECTORS OR HIGH PRESSURE CONNECTORS

--------------------------------------------------------------------------------

Perform the no trouble test "*INJECTOR RETURN FLOW TEST". (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Are any Injectors leaking or high pressure connectors leaking?

Yes
Replace or repair the leaking fuel injectors or high pressure connectors.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No
Go To12


12. HIGH PRESSURE FUEL PUMP

--------------------------------------------------------------------------------

Perform the no trouble code test "*HIGH PRESSURE FUEL PUMP PERFORMANCE TEST". (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Did the fuel pump pass the high pressure fuel pump performance test?

Yes
Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

No
Replace the High pressure fuel pump.
Perform POWERTRAIN VERIFICATION TEST (DIESEL). (Refer to 9 - ENGINE - STANDARD PROCEDURE)

 

VZ, You are da man, Now I gotta go through and see what might have thrown my 0148......... I wish there was a page like this for every code, and these pages got linked into the wiki, then the world would be a lil easier ! any way you can make that ahppen, or any way we can help you make it happen ?

 

For the time being, I'll just put 'em up as I can! LOL That'd be a TON of copy and paste clicks! LOL

 

that is awesome but at this point if you knew the troubles i ve had you would also opt for the gun

 

Oh....I've been there....! I'd be guessing, but it sounds like the dual CP3's are creating an excessive amount of volume that turns to pressure that the ecm is seeing. There needs to be a way to bypass the extra CP3 at low rpm's or low load's at least. Hmmmm....no one else running into this?

 

it also runs rough up top it pops and down low it jerks it feels more like not enough

 

I'm curious as to what the rail pressure is? Does the Dipricol guage hook to the rail pressure sensor? I wouldn't see why it would have any trouble reading it, since theoretically it should run the same pressures as before the dual CP3's. Maybe the blow off valve is leaking? The not idling down and such sure sounds like a sticking FCA though......several issues.....hmmm.....'bout gonna have to have a scanner ( CANBUS comaptible ) to read rail pressures, both desired and actual, and to read FCA. It is a duty type solenoid. IIRC, you should be able to feel it click with just the key on. It might be stuck!

 

the gauge reads off rail pressue sensor that is coming from dipricol they told me to get it off or mess up gauge. I when I put cp3"s on I drove 10 minutes and blew a hole out the side of the stock cp3 had to have replaced had to have injectors repaired lines cleaned etc also I have not turned on mp8 yet untill I can run gauge

 

What caused this?

 

lloyd posted some pictures on that cp3... WOW!

 

where are those pics