Need HELP 2004 LS P2106

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Triumph66

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I am working on a 2004 LS 3.9L for my sons friend. The car keeps going in to ETC fail safe always at 65 mph.As of right now the only codes in the PCM are P1000 and the P2106.
The car came to me with a bunch of issues, codes and parts. He wanted me to replace the TB, all 8 COP, plugs , 1 wheel bearing, throttle pedal assembly, steering position sensor. All because other people told him to. After all that the advance trac and ABS lights still came on along with the ETC FS . Now it is my turn to dig in and see what is going on. I also learn that i am fixing another persons half a$$ work and the car was in an accident. I found the front calipers each had a frozen slider pin,1 bad rear caliper, damaged ABS ring in rear, coolant leak,shorted EGR, and damaged wires from the accident throw in some Jerry rigging too . All issues have been addressed. The damaged wires have been repaired which solved the advance trac and ABS light. At a loss as to why I still have the ETC FS.
 
A number of things can cause ETC failsafe, including the ABS. I am guessing that you are using a generic OBDII scanner and that is why you are only getting the generic result code. Forscan is cheap (free Windows software and $18 OBDII adapter). That will get you the other codes that you need to troubleshoot this.
 
joegr said:
A number of things can cause ETC failsafe, including the ABS. I am guessing that you are using a generic OBDII scanner and that is why you are only getting the generic result code. Forscan is cheap (free Windows software and $18 OBDII adapter). That will get you the other codes that you need to troubleshoot this.
Click to expand...

I do have forscan. I had thought the ABS and Advance trac lights could cause this issue so I think i addressed those problems.I may have missed something.

This is everything listed from Forscan.
PCM P1000-FF
PCM P2106-FF
OBDII P2106-P
DSM None
DDM B2320
EATC B1265
ACM U2025
ACM U2005
ACM U2008
MC U1262
IC U1262
GEM None
REM None
EPB None
ABS None
RCM None
 
Triumph66 said:
I do have forscan. I had thought the ABS and Advance trac lights could cause this issue so I think i addressed those problems.I may have missed something.

This is everything listed from Forscan.
PCM P1000-FF
PCM P2106-FF
OBDII P2106-P
DSM None
DDM B2320
EATC B1265
ACM U2025
ACM U2005
ACM U2008
MC U1262
IC U1262
GEM None
REM None
EPB None
ABS None
RCM None
Click to expand...
"What are some common repairs? Repair coolant leak Replacing or cleaning ABS sensor Replacing or cleaning EGR Valve Replacing or cleaning Mass Airflow sensor Cleaning corrosion from connectors Repairing or replacing wiring Flashing or replacing PCM

Read more at: P2106 Throttle Actuator Control System - Forced Limited Power
Copyright OBD-Codes.com "
This is a generic answer but as Joe said ...many issues can factor in to cause Fail-Safe
 
Triumph66 said:
I do have forscan. I had thought the ABS and Advance trac lights could cause this issue so I think i addressed those problems.I may have missed something.

This is everything listed from Forscan.
PCM P1000-FF
PCM P2106-FF
OBDII P2106-P
DSM None
DDM B2320
EATC B1265
ACM U2025
ACM U2005
ACM U2008
MC U1262
IC U1262
GEM None
REM None
EPB None
ABS None
RCM None
Click to expand...
Not sure if this will help but here is an article about P2106 ...this guy has a F-150 but as you can see there was a TSB for 2003-2005 Lincoln LS...Cheers!
"Re: Another Throttle Problem
Post by SknirB » Wed Feb 24, 2010 11:53 am

UPDATE:

Followed the instructions in the following TSB ad all my problems went away. Was lucky enough that my place of work has a fleet of Fords so the guys out there had all the equipment to fix me up. Guess i wont have to resort to the stealership afterall

TSB
05-14-4
WRENCH LIGHT ON WITH BOTH DTC P2106 AND P2135 - VEHICLES BUILT 11/29/2004 AND PRIOR
Publication Date: June 30, 2005

FORD:
2003-2005 Thunderbird
2005 Crown Victoria, Mustang
2004-2005 Explorer, F-150
2005 E-Series, Expedition, F-Super Duty
LINCOLN:
2003-2005 LS
2005 Town Car, Navigator
MERCURY:
2005 Grand Marquis
2004-2005 Mountaineer
This article supersedes TSB 05-09-15 to update the Issue and Dealer Coding.

ISSUE:

Some vehicles built 11/29/2004 and prior may exhibit the wrench light on with both P2106 and P2135 diagnostic trouble codes (DTCs).

ACTION:

Replace the throttle position sensor (TPS) following the instruction sheet included in the TPS service kit.Reprogram the powertrain control module (PCM) to the latest calibration using WDS release B36.11 and higher, or B37.2 and higher. This new calibration is not included in the B37 CD. Calibration files are also available at http://www.motorcraft.com" onclick="window.open(this.href);return false;.

Im not sure that I even needed to replace my TPS sensor....the old one tested ok with the voltage test but I had already purchased one and they wouldnt take it back ( no refunds on electronic parts ) so I think that the only thing that was really needed was the PCM calibration for whatever reason."
 
AmsterDutch said:
"What are some common repairs? Repair coolant leak Replacing or cleaning ABS sensor Replacing or cleaning EGR Valve Replacing or cleaning Mass Airflow sensor Cleaning corrosion from connectors Repairing or replacing wiring Flashing or replacing PCM

Read more at: P2106 Throttle Actuator Control System - Forced Limited Power
Copyright OBD-Codes.com "
This is a generic answer but as Joe said ...many issues can factor in to cause Fail-Safe
Click to expand...

I did repair a coolant leak, and bled the system. He had someone else do a R front wheel bearing I did the L to get rid of a bad Junkyard part. I freed up the stuck caliper pins As well. One wire that was broken up front was the L speed sensor input.
The EGR valve was shorted internally so that was replaced. The MAF sensor was replaced as well because the internal IAT was reading way off. The reluctor ring on the L rear half shaft was worn down and missing teeth and had ripped boots again a junkyard part. I replaced the shaft with a new one.I did learn that the rear axle is from a 2002.Are there any compatibility issues putting 2002 rear axle assembly into a 2004??
For the first time yesterday I was able to run the KOER to completion with forscan .Still wont complete the KOEO test. I wonder If, what ever issue is keep it from completing the test is causing the fail safe. I will scan it with my Innova. That tells me why it won't complete the test. I did have the ECM looked at. They said electronically it is good. Said that i should update my software. Can this be done with forscan??
 
Triumph66 said:
Are there any compatibility issues putting 2002 rear axle assembly into a 2004??
Click to expand...

Yes... there can be.

There are a couple of older threads on here where members ABS modules went bad... and they went to a junkyard for a replacement.

The module ended up being incompatible for reasons I can't remember.
 
They're different lengths. Gen 1 has two equal-length half shafts. Gen 2 has an offset diff so the lengths are different between left and right
 
FDR said:
They're different lengths. Gen 1 has two equal-length half shafts. Gen 2 has an offset diff so the lengths are different between left and right
Click to expand...

Are you in the correct thread?
 
joegr said:
Are you in the correct thread?
Click to expand...

I read the below as swapping the half shafts from an 02 into an 04. Did "rear axle assembly" mean the rear subframe?

Triumph66 said:
The reluctor ring on the L rear half shaft was worn down and missing teeth and had ripped boots again a junkyard part. I replaced the shaft with a new one.I did learn that the rear axle is from a 2002.Are there any compatibility issues putting 2002 rear axle assembly into a 2004??
Click to expand...
 
FDR said:
I read the below as swapping the half shafts from an 02 into an 04. Did "rear axle assembly" mean the rear subframe?
Click to expand...

Yes the whole assembly from backplate to backplate. The shafts are so different ,like a square peg round hole different. The length diameter and splines.
I just had a thought. Is there a build tag on the differential to tell me the gear ratio? and if different from as built can the PCM be altered to match? I took a look at the snapshot from my scanner when the 2106 happened. Speed said 57 mph dash said more like 65. Also scanner said 4460 RPM I do not think the dash said anything near that.
 
Yes, there should be a tag

The gauges are controlled by computer. Whatever the scanner is reading is what the gauges are being told to show. The needles aren't keyed so it's possible they're misaligned or there may be drag against the movement. Vehicle speed is measured at the wheels through the ABS sensors, so the diff ratio won't affect that.

I'm not sure if a different ratio will throw a code due to the trans spinning at a different speed. I know SCT tuners can change the ratio, which is the only reason I wonder if it monitors the ratio. I suppose its also possible to find an original flash for the car if you stick to factory ratios, though maybe not in the needed engine/diff combo
 
There is a sensor for transmission output shaft speed. I think that it is only used for transmission management, but I am not 100% sure of that. I am certain that the speedometer only uses the wheel speed sensors.
 
If no tag is present... there is a way to check the ratio of the installed diff/axle assembly... but you also need to know the ratio of the original diff/axle assembly.

Raise the rear of the car and put on jack stands. Put car in neutral. Chock one rear wheel... to keep it from turning.

Paint stick or chalk mark the bottom of the diff... right below the pinion bearing. Put another mark on the bottom of the drive shaft... in line with mark on the diff.

Put a chalk mark on the bottom inside sidewall of the tire that is NOT chocked... at the 6 o'clock position.

Rotate the tire one revolution... and count the number of times you see the chalk line on the driveshaft. It should be AT LEAST 3.

If the chalk mark ends up roughly at the 12 o'clock position on the driveshaft... the ratio is 3.58 ... if it ends up at the 4 o'clock or 8 o'clock position, (depending on which way you rotate the driveshaft)... the ratio is 3.31.

If the mark ends up at 6 o'clock... it would be 3.07 .
 
The vehicle certification label on the driver's door shows the original ratio, which should be 3.58 in this case.
 
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