!997 F-150 4x4, 4.6 with 157,000 miles. Code reads Baro sensor, can't seem to find this sensor, any body ever replaced one?

 

What code number are you getting?

 

I beleive it was P1151, I'll have to recheck! Thanks for the reply !!

 

P1151
Lack of HO2S-21 Switch, Sensor Indicates Lean


There is a EGR Barometric Pressure Sensor
The EGR Barometric sensor is connected to the EGR Check solenoid by a short orifice tube. This sensor converts pressure change information and relays it to the PCM when the PCM activates the EGR Check solenoid.

 

So what does this mean? I know it has something to do with Emissions but the the Heck?

 

Best to get the code # again to be sure.

 

Yeah your correct! I'll stop by Auto Zone on the way home. I sure appreciate your response!

 

You're confusing a generic device description with something else (DPFE sensor, it seems).

There is no BARO sensor on his engine.

Steve

 

What I posted was directly from Ford Tech Resources for a '97. It was confusing to me, in fact. What it describes does sound like a DPFE sensor to me. You seem to be up on this emissions stuff much more than me so I do stand corrected.
But that "P1151 Lack of HO2S-21 Switch, Sensor Indicates Lean" ( if that's his correct code) came straight off of Fords site, not some generic reference. I'm sure BigJohn welcomes the correct info.

 

Ncranchero,
I Went By Auto Zone And The Code Was 1450 Which Means A Fuel Pressure Proiblem. I Checked My Gas Cap And The Spring Inside Seems Free, Any Idea What Else I Can Check?

 

DTC P1450 (unable to bleed-up fuel tank vacuum)
P1450 is a small vacuum leak in the Evap recovery system and the last one I had, on a Taurus, was in fact a bad gas cap. Check the seal surface or just go get a new $5.00 Stant cap.

Maybe projectSHO89 can let us know if we're on the right track here.......

================================================== =========
(a)
P1450 Emission DTC
997 PCED On Board Diagnostics II A SECTION 1A: Description and Operation

Evaporative Emission (EVAP) Running Loss System Monitor
The Evaporative Emission (EVAP) Running Loss System Monitor is an on-board strategy designed to detect a leak from a hole (opening) equal to or greater than 1.016 mm (0.040 inch) in the EVAP Running Loss system. The proper function of the individual components of the EVAP Running Loss system as well as its ability to flow fuel vapor to the engine is also examined. The EVAP Running Loss System Monitor relies on the individual components of the EVAP Running Loss system to apply vacuum to the fuel tank and then seal the entire EVAP Running Loss system from atmosphere. The fuel tank pressure is then monitored to determine the total vacuum lost (bleed-up) for a calibrated period of time. Inputs from the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, mass air flow (MAF) sensor, vehicle speed sensor (VSS), fuel level input (FLI) and fuel tank pressure (FTP) sensor are required to enable the EVAP Running Loss System Monitor.
Note: During the EVAP Running Loss System Monitor Repair Verification Drive Cycle a PCM reset with key on, engine off will bypass the minimum soak time required to complete the monitor. The EVAP Running Loss System Monitor will not run if the key is turned off after a PCM reset. The EVAP Running Loss System Monitor will not run if a MAF sensor failure is indicated. The EVAP Running Loss System Monitor will not initiate until the Heated Oxygen Sensor (HO2S) Monitor has completed.
The EVAP Running Loss System Monitor is executed by the individual components of the EVAP Running Loss system as follows:
1. The function of the EVAP canister purge valve is to create a vacuum on the fuel tank. A minimum duty cycle on the EVAP canister purge valve (75%) must be met before the EVAP Running Loss System Monitor can begin.
2. The canister vent (CV) solenoid will close (100% duty cycle) with the EVAP canister purge valve at its minimum duty cycle to seal the EVAP Running Loss system from atmosphere and obtain a target vacuum on the fuel tank.
3. The fuel tank pressure (FTP) sensor will be used by the EVAP Running Loss System Monitor to determine if the target vacuum on the fuel tank is being reached to perform the leak check. Once the target vacuum on the fuel tank is achieved, the change in fuel tank vacuum for a calibrated period of time will determine if a leak exists.


Figure 13: Evaporative Emission (EVAP) Running Loss System Monitor Monitor
4. If the initial target vacuum cannot be reached, DTC P0455 (large leak or no purge detected) will be set. The EVAP Running Loss System Monitor will abort and not continue with the leak check portion of the test.

If the initial target vacuum is exceeded, a system flow fault exists and DTC P1450 (unable to bleed-up fuel tank vacuum) is set. The EVAP Running Loss System Monitor will abort and not continue with the leak check portion of the test.

If the target vacuum is obtained on the fuel tank, the change in the fuel tank vacuum (bleed-up) will be calculated for a calibrated period of time. The calculated change in fuel tank vacuum will be compared to a calibrated threshold for a leak from a hole (opening) of 1.016 mm (0.040 inch) in the EVAP Running Loss system. If the calculated bleed-up is less than the calibrated threshold, the EVAP Running Loss system passes. If the calculated bleed-up exceeds the calibrated threshold, the test will abort and rerun the test up to three times.

If the bleed-up threshold is still being exceeded after three tests, a vapor generation check must be performed before DTC P0442 (small leak detected) will be set. This is accomplished by returning the EVAP Running Loss system to atmospheric pressure by closing the EVAP canister purge valve and opening the CV solenoid. Once the FTP sensor observes the fuel tank is at atmospheric pressure, the CV solenoid closes and seals the EVAP Running Loss system.

The fuel tank pressure build-up for a calibrated period of time will be compared to a calibrated threshold for pressure build-up due to vapor generation.

If the fuel tank pressure build-up exceeds the threshold, the leak test results are invalid due to vapor generation. The EVAP Running Loss System Monitor will pass and complete.

If the fuel tank pressure build-up does not exceed the threshold, the leak test results are valid and DTC P0442 will be set.
5. The malfunction indicator lamp (MIL) is activated for DTCs P0442, P0455 and P1450 (or P446) after two occurrences of the same fault. The MIL can also be activated for any EVAP Running Loss system component DTCs in the same manner. The EVAP Running Loss system component DTCs P0443, P0452, P0453 and P1451 are tested as part of the Comprehensive Component Monitor (CCM).
(a) Credit to Ford Motor Co.

 

Thanks Steve, I assume one can purchase a stant cap at Auto Zone?

 

AZ may sell their own brand I don't know. I don't shop there much.

OK, Auto Zone,
Non threaded cap, has two locking tabs is # 5502
Threaded cap is #6833

 

Can somebody tell me where exactly in the F150 the FTP sensor is installed?
I am finishing up the details on an engine swap project and I need to install that sensor for the emissions system.
I have seen lots of pictures of the F150 fuel pump / level sender assy and the sensor is not installed there. It could be installed in the tank somewhere or in a remote location with a vapor hose feeding it.

Can someone who knows about this stuff(familiar with the F150 fuel tank/emissions system) please help me figure it out. I would love to hear that there is a remotely mounted ftp sensor outside the tank.

Thanks

 

Here is what a sensor that is mounted on the tank looks like.

Anybody know if there is one of these mounted in a '98ish F150 tank?