MKIV Jetta -- Readiness problems + 17544 lean fuel trim problem

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carmageddon

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So I'm trying to get my 2003 Jetta ready for a state inspection and every time I get the readiness monitors good it throws a g-damn 17544 code (usually right when I arrive at the testing center or on the way).

I've observed my LTFT and STFT after clearing DTCs and they are indeed screwed up. Short term idle goes way up (like +30) and the long term will creep up higher and higher.

I cleaned the MAF. Car ran better but really no change.
I did a pressure test at the TIP... no hissing.
I did a smoke test. No leaks detected by smoke.

What to check next??

The SAI is broken and never passes readiness. I assume the pump has gone. Could this be causing the unmetered air problem?

Appreciate any direction to go from here...

Jay

Code:
Thursday,23,June,2022,20:48:29:29193
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.3.1.4 (x64)  HEX-V2 CB: 0.4615.4
Data version: 20220407 DS337.0
www.Ross-Tech.com


VIN: 3VWPE69M03M1XXXXX   License Plate:
Mileage: 175140km-108826mi   Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 9M (1J - VW Golf/Bora IV (1998 > 2006))
Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75
          76
 
VIN: 3VWPE69M03M1XXXXX   Mileage: 175140km-108826miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-AWP.lbl
   Part No: 06A 906 032 LQ
   Component: 1.8L R4/5VT     G   0007 
   Coding: 07550
   Shop #: WSC 80179 
   VCID: 78AAE0831BC46B5BF7F-5160
   3VWPE69M03M1XXXXX     VWZ7Z0C6704090

No fault code found.
Readiness: 0100 1001

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09A-927-750.lbl
   Part No: 09A 927 750 AJ
   Component: AG5 Getriebe 09A   0215   
   VCID: 73B0D7AF02A20803C2D-5066

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1C0-907-37x-ESP-F.lbl
   Part No: 1C0 907 379 M
   Component: ESP FRONT MK60      0102 
   Coding: 0019970
   Shop #: WSC 00066 000 00000
   VCID: 343214B3422C4F3B1B7-5184

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 1C0 909 605 F
   Component: 04 AIRBAG VW61 0202 0001 
   Coding: 12340
   Shop #: WSC 00066 
   VCID: 2708F3FF86FA34A3AE5-513C

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 1J0-920-xx5-17.lbl
   Part No: 1J0 920 906 N
   Component: KOMBI+WEGFAHRSP VDO V65 
   Coding: 07234
   Shop #: WSC 26085 
   VCID: 333017AF4222480302D-513C
   3VWPE69M03M1XXXXX     VWZ7Z0C6704090

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-19.clb
   Part No: 6N0 909 901
   Component: Gateway K<->CAN    0001 
   Coding: 00006
   Shop #: WSC 26085 
   VCID: 70BAD8A373B4331B3FF-513C

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 1C0-959-799.lbl
   Part No: 1C0 959 799 C
   Component: 1H Komfortgerát HLO 0003 
   Coding: 00258
   Shop #: WSC 00066 
   VCID: 372823BF565AA4233E5-4B1E

   Subsystem 1 - Part No: 1C1959801A
   Component: 1H Tõrsteuer.FS KLO 0009 

   Subsystem 2 - Part No: 1C1959802A
   Component: 1H Tõrsteuer.BF KLO 0009 

   Subsystem 3 - Part No: 1C0959811A
   Component: 1H Tõrsteuer.HL KLO 0009 

   Subsystem 4 - Part No: 1C0959812A
   Component: 1H Tõrsteuer.HR KLO 0009 

6 Faults Found:
01331 - Door Control Module; Driver Side (J386)
            53-10 - Supply Voltage Too Low - Intermittent
00928 - Locking Module for Central Locking; Front Driver Side (F220)
            27-00 - Implausible Signal
01359 - Internal Central Locking Switch; Passenger Side (E198)
            27-10 - Implausible Signal - Intermittent
00929 - Locking Module for Central Locking; Front Passenger Side (F221)
            27-00 - Implausible Signal
00930 - Locking Module for Central Locking; Rear Left (F222)
            27-10 - Implausible Signal - Intermittent
00931 - Locking Module for Central Locking; Rear Right (F223)
            27-00 - Implausible Signal

End----------(Elapsed Time: 05:00, VBatt start/end: 14.0V/14.0V)-----------
 

Uwe

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carmageddon

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In Texas you can have 1 failed monitor on a car of that vintage. That has been my single failure for several years now.

MIL light is never OK... that's my issue.
 
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carmageddon

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After doing some diagnostic work on the car's secondary air system I figured out that my pump is good... plumbing is good... combi is good... N112 bad. I replaced the 1/4 inch-ish horrible plastic vacuum lines where the N112 lives and capped off the vac line feeding the N112 and the car is ever so slightly happier. It throws a code if the dead N112 isn't plugged in.

LTFT at idle is at +7.5% which still seems a bit high. It has not thrown a CEL though.

I can't get the stupid catalytic converter readiness monitor to set. It was setting without a problem using the readiness script only a few days ago... it's the only thing standing between me and a state inspection.

Any tips on getting that CC monitor to set?? Car is bone stock.
 

EuroX

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I would be checking for vacuum leaks. Mk4 1.8t engine has a ton of vacuum line and garbage under the intake that normally breaks. Without addressing and repairing the issue at hand you will never pass inspection.

Texas allows 1 non-continous monitor to be not set.

Non-Continuous Monitors​

Other OBD II monitors are only active during certain times. These are the "non-continuous" monitors and include the catalytic converter efficiency monitor, the evaporative system monitor that detects fuel vapor leaks in the fuel system, the EGR system monitors, the secondary air system monitor (if the vehicle has such a system), and the oxygen sensor monitors.

If you don't have a working SAI pump the mil will be triggered when running the test. If you have a MIL on the vehicle will not pass inspection.
 

carmageddon

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Thanks for your reply.

The SAI pump is working. The N112 is broken. The car won't throw a CEL if the broken N112 is plugged in so I'm good on that (for inspection). I capped the active vac line which helped.

On vac leaks -- I did a pressure test and listened for hiss... nothin'. I did a smoke check... nothin'. Any thoughts on what else to check for vac leaks?

One clue -- after sitting the brake pedal feels like there is no vacuum to the booster. A long time ago I replaced the vac line to the brake booster with the check valve. It didn't really fix it. Cracked vac reservoir? Bad brake booster?

I have very little experience with the vac system so I'm sorta grasping at whatever.
 

EuroX

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I have seen line to booster cause lean fault but normally the check valve was incorrectly installed in terms of flow or the line was split further up.
 

carmageddon

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Well by some voodoo magic I got all the readiness monitors passed (except SAI of course). I drove straight to the testing center and the lazy son of a b-tch tech told me my tires were bad and he couldn't pass me (total 100% lie). By sheer luck I made it to another more honest testing station and passed before the 17544 CEL was thrown.

For those who found this thread in a similar boat. If your SAI system is not working try unplugging the vac lines to the N112 and plugging the line that doesn't go to the combi valve (I used a fine thread machine screw... worked perfect). The combi valve line can be left open. To test your combi valve just connect those two lines.

Good luck fixing all of the plastic vac lines you break getting to the N112. 1/4 inch copper tubing made a surprisingly suitable temp replacement on my car. I might leave it.
 
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