Interpret Codes

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Dec 21, 2004 | 04:20 AM

SgtJoe

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Joined: May 2004

Posts: 120

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From: Vandenberg Air Force Base

Interpret Codes

Happy holidays all! I am looking for a nice Christmas gift here. Below is data I pulled from a scanner while troubleshooting why my '96 Aerostar 4.0L engine runs rough. Can anyone help me interpret? Who here speaks this language? Do I have a bad O2 sensor and EGR? Here it is:

P0401 EGR flow insufficient
P0171 System too lean bank one
P1000 OBD II system checks inc
P0733 code def not available
P1701 Reverse engagement error
Fuel PWI (MS) 3.3
Fuel PW2 (MS) 16.3
MAF 4.23 (gm/s)
Spark advance 10
DPFE (v) 1.30
MAF (v) 0.68
IA Cfault-no
MIL on
TP(v) 0.96
Load 10.5%
ECT(v) 1.38
Baro (Kpa) 92
Baro (Hz) 150: (I am on an island at sea level)
ECT (C) 60
IAT (v) 2.23
IAT 36 degrees
O2S11 (Mv) bounces around from 47 to 800
O2S21 (Mv) 0
LF Trim 1(%) 25
LF Trim 2(%) 25
SF Trim 2(%) -1, -4, 5
O2S12 (Mv) 103, 96, 708
Fuel P
EGRVR 1.6
TPRel 0.95
No inj faults
HTRII Fault no
HTRII yes
HTRIIA off
HTR12 yes
HTR12A off
HTR12 fault no
HTR21 yes
HTR21A off
HTR fault no
HTR22 no
HTR22A off
HTR22 fault no
HTRX1 off
HTRX2 off
Loop closed
ARC fault yes
HFC fault no

Any help for me? Thank you in advance.

- Joe

Dec 21, 2004 | 10:01 AM

stepman

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From: peoria, az

I'll give it a shot. What kind of milage are we working with? May have a bad plug wire but....I would start by looking at that PO401. There are a few threads on here about that as they seem to be a problem, not with the valve but with the passages getting plugged. The "system lean, bank 1" doesn't appear to make sense as your O2 on bank 1 (O2S11) appears to be switching normally. Although the O2 on bank 2 (O2S21) appears dead.Do you know what O2S22 or SF Trim 1 would be? How about more details on "runs rough"? Is it rough all the time, at idle, when giving it some gas...?

Dec 21, 2004 | 10:09 AM

SgtJoe

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Joined: May 2004

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From: Vandenberg Air Force Base

Thank you for the reply, looks like you have some experience with this.

The van has 170,000 miles on it. I don't know what O2S22 or SF trim 1 would be, I only copied them from the scanner reading.

The van runs the roughest when cold and idling. Lately it has been stalling when accelerating from a stop.

Thanks again for your reply.

Dec 21, 2004 | 08:36 PM

Racerguy

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Joined: Aug 2002

Posts: 12,679

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From: BC, Canada

Your Long Term fuel trims at 25% tells me that it runs way too lean. The PCM is trying to richen it up all the time. A common cause of that and the rough idle and P0171 is a vacuum leak, quite often the intake gaskets on the top and bottom of the fuel rail.
If that snapshot was at an idle then the DPFE reading is too high which causing the P0401. A stuck EGR valve can cause that and also cause stalling, rough idle etc.
If the EGR valve is ok and lot stuck open or leaking then the most common cause of a P0401 is a bad DPFE sensor.
Your MAF reading is borderline too low too which can also point to a vacuum leak.
Also take a look at http://www.clubfte.com/users/racerguy/VTA06199.htm

Dec 22, 2004 | 08:42 AM

stepman

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From: peoria, az

Good points Racerguy. It sure is looking a lot like a stuck valve (EGR), especially with those symptoms and that much milage. Probably an origonal one too. After you get that worked out, clear your codes and see if the others come back. ( Other than the P1000 that is)

Racerguy...We have an argument going about this at work and I have yet to try,so maybe you can answer it. Can the codes be cleared merely by unplugging the battery, or do you have to use the scan tool? I think the battery works because when we remove the cables to clean them we always end up with a P1000, but others swear that you need the tool.

Last edited by stepman; Dec 22, 2004 at 08:46 AM.

Dec 22, 2004 | 09:22 AM

BarryFS

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Joined: Sep 2003

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From: Winnipeg

My scan tool book said that the codes clear after about 10 mins without power. (but then it also called it a brattlery ... so ...)

Dec 22, 2004 | 09:31 AM

Racerguy

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Joined: Aug 2002

Posts: 12,679

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From: BC, Canada

brattlery? umm what kind of translation was that? It sounds like something off www.engrish.com

Yes the codes will clear by disconnecting the battery for a few minutes. The P1000 means that since the computer was reset not all the "monitors" in it are complete. The engine control systems each have a monitor. They are constantly checking the systems to make sure they are working right.