Codes PO 0090/U1800

[jojo]

Codes will not clear/erase.

Has the computer or FICM failed?

Background: code PO 0090 had tripped and Truck would not start until code was cleared. Code PO 0090 would not clear after multiple attempts to clear and U1800 appeared on scanner.

I replaced cp3. Code will not clear

 

[aashton1206]

New fpr


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, Turbo port and polish, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Yellow Top Optimas, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.

 

[Chevy1925]

you need to check the wiring to the FPR, ohm it, check for voltage, etc. then test the FPR. you keep clearing the computers is probably causing the u1800

 

[jojo]

What should the reading be on the voltage tester if system checks out good?

 

[jojo]

Sorry for not getting back to this sooner. Got busy with life.

Multimeter reads very little out of FPR output. 0.04, at best. Is there a fuse or relay that can be checked? I'm under the hood right now.

 

[jojo]

Correction. A reading of 0.04 from FPR harness connector, with key in on position.

 

[jojo]

Does the FICM control signal to the FPR?

I'm starting to believe that the FICM has failed.

 

[aashton1206]

I pmed you giving an explanation


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, Turbo port and polish, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Yellow Top Optimas, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.

 

[jojo]

Received and returned.

 

[DAVe3283]

Why not post the explanation here where it can help others in the future? Not like there are any trade secrets around diagnosing a FPR.

Sent from my S60 using Tapatalk

 

[aashton1206]

Because we are in the secret itstheecmclubandyounotinvited club. Jojo needs a new ecm to regulate the few fpr.


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, Turbo port and polish, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Yellow Top Optimas, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.