FastTaco

Hit it good on the way to the house tonight and got
rail pressure sensor out of range
fuel rail pressure to high.
I've had the DIY CP3 mod for a while now and just did a 392 kit last sat. Truck has run great since then until today it doesn't want to start and now this. Both of my chips are set on level 2 and I 've never had a CEL before after 45k until now.

FastTaco

Seems like my FCA is sticking again because its surging bad. Think maybe that could be it? I'll take it apart tomorrow and try to smooth it out some more.

CReed

Could be any one of the sensors screws up seems like they all will go haywire.

FastTaco

Pulled the fca out again today and polished the crap out of it. PUt it back together and still bad surging after taking it apart twice and turning it. Think its gone bad? Also got a P088 code again on the way home.

vzdude

Turn the key on, engine off......does it click? ( the FCA that is )

vzdude

1. Fuel Pressure Sensor

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Using the scan tool, compare the scan tool reading for fuel pressure set point to the scan tool reading for actual fuel pressure.

Does the actual fuel pressure correlate with the fuel pressure setpoint while operating the engine over various operating conditions?

Yes
Go To 2

No
Check the electrical connector of the Fuel Control Actuator, if the connection is tight, replace the fuel control actuator.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)



2. FUEL PUMP

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Turn the ignition on.
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
Replace the fuel pump.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

No
Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

FastTaco

Well I ordered a new FCA from the dealership today so monday when I get it and put it on we'll see if the problem goes away.

FastTaco

Yes it clicks.

vzdude

That's is supposedly one of the tests for it!? If it clicks it is getting power. According to the symptoms, it sounds like a failed FCA, but if it clicks it should be working to.....? May be a bad sensor for rail pressure causing bad info to the ecm?

FastTaco

Thanks for the help, I guess I'll find out when I put the new FCA on.