Could use any advice before I pull the CP3.

Back Story:
2006 Cummins with 109k mi. Died under normal acceleration at about 40mph and won't fire. Haven't been able to boost over 22psi for a month or so since I started getting a P0243. Assuming that my wastegate solenoid died and wastegate is stuck open. Truck has been a slug since that happened but I haven't driven it much until I get the new solenoid on.

Things I've done to debug...

1. Took line from Lift pump to CP3 loose at CP3 and it's pumping fuel pretty well with key on (gonna put a fuel press gauge on it tonight to check)
2. Took return line from CP3 to the filter housing loose and I get fuel with key on.
3. Loosened line at pressure relief valve and no fuel under crank (PRV Ok)
4. Loosened injector line and no fuel under crank (No fuel to injectors)
5. Loosened line out line out of CP3 to rail and no fuel under crank.
6. Pulled FCA and shook it, get some rattling noise so I'm assuming it's ok.

I can't think of anything that could cut fuel to the CP3 besides the FCA or the lift pump (and it's pumping a decent amount of fuel) and from what I hear the FCA normally gets stuck open when it goes bad. Is it possible for the FCA to get stuck completely closed and cut fuel to the CP3? Or can the ECM cut fuel to the CP3 if the lift pump pressure isn't strong enough?

I appreciate the help, looks to me like a new CP3 is in order but I wanna be sure first.

Thanks!

 

exactly how much pressure does your lift pump sustain. No maybe's or I thinks. Put a gauge on it and let us know. Yes, if the lift pump pressure drops to low the emc trys to save your CP3 and your w-a-l-l-e-t...

 

Ok, I got my gloshift fuel pressure gauge hooked up tonight. It uses the banjo bolt to the bottom of the fuel canister. It would spike to about 10psi for about 1-2 seconds with key on and then drop to the 5-7 range and stay there for the most part. it would spike off and on between 5-10 psi but I assumed it was working air out of the lines. Is 5-7 psi with no load enough fuel pressure?

Also, I checked the FCA and it is clicking when the key is turned on.

Looking like the injection pump? No codes and I loosened the CP3 to rail line at the rail and still not a drop of fuel when cranking.

 

Should be getting another code or two.

 

Just got a new code tonight after pulling the positive and then cranking it some more... P0251 - Injection pump mechanical failure... Guess that tells me what's goin on... Dang.

 

Lemme look it up.

 

That and I've been getting a P2509 for the past month but my batteries are getting older.

 

FUEL PUMP
(K181) FUEL CONTROL ACTUATOR DRIVER OPEN
(K31) RETURN CIRCUIT OPEN FROM FCA TO ECM
(K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO EXTERNAL VOLTAGE
(K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO EXTERNAL VOLTAGE
(K31) FCA RETURN CIRCUIT SHORTED TO (K181) FCA DRIVER CIRCUIT
(K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO GROUND
(K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO ANOTHER CIRCUIT
(K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO ANOTHER CIRCUIT
INTERMITTENT CONDITION
ECM

1. FUEL PUMP
Ignition on, engine not running.
Disconnect the Fuel Control Actuator (FCA) harness connector.
Connect an incandescent test light across the Fuel Control Actuator
driver circuit and the Fuel Control Actuator return circuit at the fuel control
actuator harness connector.
Observe the test light.
The ECM will perform a self test of the circuit which should momentarily
flash the test light brightly, one time, approximately 20 seconds after
being connected.
NOTE: Check connectors - Clean/repair as necessary.
NOTE: Compare test light brightness to that of a direct connection
to the battery.
Did the light flash brightly?
Yes >> Replace the Fuel Pump.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/ENGINE CONTROL MODULE - DIAGNOSIS
AND TESTING)
No >> Go To 2

Probe the connection that plugs into the actuator-fuel control.

2. (K181) FUEL CONTROL ACTUATOR DRIVER OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the FCA driver circuit between the electronic
fuel control actuator harness connector and the ECM harness connector.
Is the resistance less than 10 Ohms?
Yes >> Go To 3
No >> Repair the (K181) Fuel Control Actuator Driver circuit
OPEN.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/ENGINE CONTROL MODULE - DIAGNOSIS
AND TESTING)

Probe the #1 terminal on the actuator fuel control connection harness (be on your left with the latch on top) and pin #6 on the ECM connection C1

3. (K31) RETURN CIRCUIT OPEN
Measure the resistance of the (K31) return circuit between the FCA harness
connector and the ECM harness connector.
Is the resistance less than 10 Ohms?
Yes >> Go To 4
No >> Repair or replace the engine wiring harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/ENGINE CONTROL MODULE - DIAGNOSIS
AND TESTING)

Probe #2 on the FCA harness connection and #19 pin on the ECM connection

4. (K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO EXTERNAL VOLTAGE
Measure the voltage between the (K181) FCA driver circuit in the FCA
harness connector and battery negative.
Is the voltage greater than 1 volts?
Yes >> Repair the (K181) FCA driver circuit shorted to external voltage.
No >> Go To 5

Probe #1 pin on the FCA harness connection

5. (K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO EXTERNAL VOLTAGE
Measure the voltage between the (K31) FCA return circuit in the FCA
harness connector and battery negative.
Is the voltage greater than 1 volts?
Yes >> Repair the (K31) FCA return circuit shorted to external voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/ENGINE CONTROL MODULE - DIAGNOSIS
AND TESTING)
No >> Go To 6

Probe #2 FCA harness connection

6. (K31) FCA RETURN CIRCUIT SHORTED TO (K181) FCA DRIVER CIRCUIT
Measure the Resistance between the return circuit in the FCA harness
connector and Driver circuit.
Is the resistance less than 10 Ohms?
Yes >> Repair the (K31) FCA Return circuit shorted to (K181) FCA
Driver circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/ENGINE CONTROL MODULE - DIAGNOSIS
AND TESTING)
No >> Go To 7

Probe both FCA harness connections

7. (K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO GROUND
Measure the resistance between the (K181) FCA driver circuit in the
FCA harness connector and battery negative.
Is the resistance less than 10 Ohms?
Yes >> Repair the (K181) FCA driver circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/ENGINE CONTROL MODULE - DIAGNOSIS
AND TESTING)
No >> Go To 8

Probe #1 FCA harness connection

8. (K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO ANOTHER CIRCUIT
Measure the resistance between the (K181) FCA driver circuit in the
ECM harness connector and all other circuits in the ECM connectors.
Is the resistance less than 10 Ohms?
No >> Go To 9
Yes >> Repair the (K181) FCA driver circuit shorted to another circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/ENGINE CONTROL MODULE - DIAGNOSIS
AND TESTING)

Probe #6 pin on the ECM connection C1

9. (K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO ANOTHER CIRCUIT
Measure the resistance between the (K31) FCA Return circuit in the
ECM harness connector and all other circuits in the ECM connectors.8
Is the resistance less than 10 Ohms?
No >> Go To 10
Yes >> Repair the (K31) FCA Return circuit shorted to another circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/ENGINE CONTROL MODULE - DIAGNOSIS
AND TESTING)

Probe #19 pin on the ECM connection C1

10. ECM
Reconnect the ECM harness connectors.
Ignition on, engine not running.
Disconnect the Electronic Fuel Control Actuator connector.
Connect an incandescent test light across the Fuel Control Actuator
driver pin and the Fuel Control Actuator return wire at the fuel control
actuator connector.
Observe the test light.
The ECM will perform a self test of the circuit which should momentarily
flash the test light brightly, one time, approximately 20 seconds after
being connected.
NOTE: Compare test light brightness to that of a direct connection
to the battery.
Did the light flash brightly?
Yes >> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic
Procedure). (Refer to 9 - ENGINE - DIAGNOSIS
AND TESTING)
No >> Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

Probe both pins on the FCA connection harness

 

Be about an hour or two of trouble shooting. But if it turns out to be something electrical or the fuel pump ($300), better than dumping $1200 on a new CP3, and it not being the problem.

Also, be sure to clean all the connections on the batteries and the ground points on the truck. maybe that'll take care of the power down data code. If not, check the voltage on both batteries, if above 12 volts got other issues. If not, charge them, then do a load test.