CEL came on last night - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 12-20-2007
-kyle-'s Avatar
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CEL came on last night

Just scanned my truck at work and the following codes came up



P1443 - AUXILLARY EMISSION CONTROLS

P0171 - SYSTEM TO LEAN (BANK 1)

P0174 - SYSTEM TOO LEAN (BANK 2)

P0153 - 02 SENSOR CKT SLOW RESPONSE ( BANK 2 SENSOR 1)


This is all on a 97 4.0 OHV with 128K on it

Where should I start?
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  #2  
Old 12-21-2007
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FORD MOTOR COMPANY REVISION DATE: SEPTEMBER 14, 2001 PAGE 18 OF 57

Typical 0.020 EVAP monitor malfunction thresholds:
P1450 (Excessive vacuum): < -8.0 in H2O over a 30 second evaluation time.
P0455 (Gross leak): > -8.0 in H2O over a 30 second evaluation time.
P0457 (Gross leak, cap off): > -8.0 in H2O over a 30 second evaluation time after a refueling event.
P1443 (Gross leak, no flow): > -8.0 in H2O over a 30 second evaluation time with < 0.02 lb/min vapor flow.
P0442 (0.040 leak): > 2.5 in H2O bleed-up over a 15 sec. evaluation time at 75% fuel fill.
(Note: bleed-up and evaluation times vary as a function of fuel fill level).
P0456 (0.020 leak): > 2.5 in H2O bleed-up over a 30 sec. evaluation time at 75% fuel fill.
(Note: bleed-up and evaluation times vary as a function of fuel fill level)
P0442 vapor generation limit: < 2.5 in H2O over a 100 second evaluation time.


So, I'd look at the Evap system and its hoses. Fix that and see if the other codes go away. Sounds like a big vacuum leak from the Evap system.
The following makes me think all these codes stem from the Evap problem:


The HO2S is also tested functionally. The response rate is evaluated by entering a special 1.5 Hz. square wave, fuel control routine. This routine drives the air/fuel ratio around stoichiometry at a calibratable frequency and magnitude, producing predictable oxygen sensor signal amplitude. A slow sensor will show reduced amplitude.
Oxygen sensor signal amplitude below a minimum threshold indicates a slow sensor malfunction. (P0133 Bank 1,
P0153 Bank 2). If the calibrated frequency was not obtained while running the test because of excessive purge vapors, etc., the test will be run again until the correct frequency is obtained.
HO2S Response Rate Operation:
DTCs P0133 (slow response Bank 1)
P0153 (slow response Bank 2)
Monitor execution once per driving cycle
Monitor Sequence None
Sensors OK ECT, IAT, MAF, VSS, CKP, TP, CMP, no misfire DTCs, FRP
Monitoring Duration 4 seconds
Typical HO2S response rate entry conditions:
Entry condition Minimum Maximum
Short Term Fuel Trim Range 70% 130%
Engine Coolant Temp 150 oF 240 oF
Intake Air Temp 140 oF
Engine Load 20% 50%
Vehicle Speed 30 mph 60 mph
Engine RPM 1000 rpm 2000 rpm
Time since entering closed loop fuel 10 seconds
Typical HO2Sresponse rate malfunction thresholds:
Voltage amplitude: < 0.5 volts
J1979 Mode $06 Data
Test ID Comp ID Description Units
$01 $11 HO2S11 voltage amplitude and voltage threshold volts
$01 $21 HO2S21 voltage amplitude and voltage threshold volts
$03 $01 Upstream O2 sensor switch-point voltage volts
Conversion for Test IDs $01 through $03: multiply by 0.00098 to get volts
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  #3  
Old 12-21-2007
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Canister purge valve stuck open maybe ?
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  #4  
Old 12-22-2007
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Regarding the P1443 EVAP code, good thread here: https://www.ranger-forums.com/forum2...ead.php?t=5831

Regarding the P071 and P074 lean codes, also see: https://www.ranger-forums.com/forum2...ead.php?t=7735

Also, because yours is a '97 OHV, you have to seriously consider a leaky fuel rail gasket:
Quote:
Article No. 98-6-8

LIGHT TRUCK: 1997 AEROSTAR, RANGER

This TSB article is being republished in its entirety to correct the part number listed, revise the Service Procedure, and add Aerostar.

ISSUE:
A rough idle, stalling at an idle and/or Diagnostic Trouble Codes (DTCs) P0171, P0174, P1131, and/or P1151 may be stored in memory on some vehicles with a 4.0L engine. This may be caused by the gasket located between the fuel rail and lower intake manifold losing its compressive loading and becoming drawn into the intake manifold runners resulting in a vacuum leak.

ACTION:
Replace the fuel rail-to-intake manifold paper gasket with a revised gasket. Refer to the following Service Procedure and the 1997 Ranger or Aerostar Service Manual for removal and replacement procedures...

PART NUMBER / PART NAME
F8PZ-9E436-AA / Fuel Rail-To-Intake Manifold Gasket
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  #5  
Old 02-21-2008
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Can someone explain to me where the Fuel rail is? Im guessing its the black unit sitting on top of my motor but im not sure. Just wondering if this could be the source of my pinging.
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  #6  
Old 02-22-2008
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When I had that horrible P1443 code a few years ago, I ended up replacing the purge valve. No problems with it til last week when the CEL came back.........DANG!!

Check all the vaccum lines first though, especially around the evap canister. I would recommend checking that code first as mentioned earlier as it could very well lead to the other codes.



Allen
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  #7  
Old 02-22-2008
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Quote:
Originally Posted by vansnxtweek View Post
Can someone explain to me where the Fuel rail is?
Toward the end of this PDF is a diagram and a relevant TSB that should help you: Replacing Upper Engine Gaskets on the 4.0L OHV

Are you getting any lean codes? Lean-running engines are quite prone to detonation.

You might also try decarbonizing the upper intake and cylinders. See: https://www.ranger-forums.com/forum2...40&postcount=8
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  #8  
Old 02-22-2008
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Ya I have gotten one lean code but I believe it was for my 02 sensor. I mean I know its running lean because I pulled a spark plug and that sucker was white as snow, which is scary, I just gotta find the problem.
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