2005 Navigator ENGINE FAILSAFE MODE
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You're mis-reading something. Those are P2xxx codes, not P01XX codes.
P2104: The TAC system is in the failure mode effects management (FMEM) mode of forced idle. // This DTC is an informational DTC and may be set in combination with a number of other DTCs which are causing the FMEM. Diagnose other DTCs first.
P2107: Description: The electronic throttle control (ETC) area of the powertrain control module (PCM) failed the self-test. The fault could be the result of an incorrect throttle position (TP) command, or TAC motor wires shorted together. // Possible Causes: TAC motor wire shorted together TAC motor circuit wires shorted to PWR Damaged electronic throttle body (ETB) Damaged PCM
P2110: Description: The TAC system is in the failure mode effects management (FMEM) mode of forced limited RPM. // This DTC is an informational DTC and may be set in combination with a number of other DTCs which are causing the FMEM. Diagnose other DTCs first.
The P2107 is probably the key one for diagnostic purposes. Looking through the procedure in the PCED, it looks like the fault will be a wiring concern around the TACM, a bad ETB, or a bad PCM.
P2104: The TAC system is in the failure mode effects management (FMEM) mode of forced idle. // This DTC is an informational DTC and may be set in combination with a number of other DTCs which are causing the FMEM. Diagnose other DTCs first.
P2107: Description: The electronic throttle control (ETC) area of the powertrain control module (PCM) failed the self-test. The fault could be the result of an incorrect throttle position (TP) command, or TAC motor wires shorted together. // Possible Causes: TAC motor wire shorted together TAC motor circuit wires shorted to PWR Damaged electronic throttle body (ETB) Damaged PCM
P2110: Description: The TAC system is in the failure mode effects management (FMEM) mode of forced limited RPM. // This DTC is an informational DTC and may be set in combination with a number of other DTCs which are causing the FMEM. Diagnose other DTCs first.
The P2107 is probably the key one for diagnostic purposes. Looking through the procedure in the PCED, it looks like the fault will be a wiring concern around the TACM, a bad ETB, or a bad PCM.
Is the TAC motor the electronic unit attached to the throttle body opposite of the TPS? If so, is that a replaceable part or do you end up replacing the whole TB?
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Can anyone confirm if that is the TAC motor attached to the throttle body? And so, if what was said earlier is true and most likely my problem lies with either replacing the throttle body or the PCM, I assume the logical choice would be the TB first seeing that it's a bit cheaper to replace? Keep in mind I already replaced the TPS and that didn't do it.
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From: St Louis
Yes, that's the TAC motor.
The following (if it works) are excerpts from the 2005 PCED. The entry point for a P2107 is step DV17.
https://www.dropbox.com/s/fxdsra45g13ec4z/DV_Intro.pdf
https://www.dropbox.com/s/sxene2v7dkbdnfi/DV.pdf
I haven't had the pleasure of a hands-on diagnosis of this fault, so the only thing I have is the factory manual.
The following (if it works) are excerpts from the 2005 PCED. The entry point for a P2107 is step DV17.
https://www.dropbox.com/s/fxdsra45g13ec4z/DV_Intro.pdf
https://www.dropbox.com/s/sxene2v7dkbdnfi/DV.pdf
I haven't had the pleasure of a hands-on diagnosis of this fault, so the only thing I have is the factory manual.
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Yes, that's the TAC motor.
The following (if it works) are excerpts from the 2005 PCED. The entry point for a P2107 is step DV17.
https://www.dropbox.com/s/fxdsra45g13ec4z/DV_Intro.pdf
https://www.dropbox.com/s/sxene2v7dkbdnfi/DV.pdf
I haven't had the pleasure of a hands-on diagnosis of this fault, so the only thing I have is the factory manual.
The following (if it works) are excerpts from the 2005 PCED. The entry point for a P2107 is step DV17.
https://www.dropbox.com/s/fxdsra45g13ec4z/DV_Intro.pdf
https://www.dropbox.com/s/sxene2v7dkbdnfi/DV.pdf
I haven't had the pleasure of a hands-on diagnosis of this fault, so the only thing I have is the factory manual.
so I went to DV17
DV17 - Inspect the TACM for damaged housing, harness connector, and harness. Everything looks normal or intact....
DV18 - CHECK THE TACM FOR A SHORT OR OPEN - Is the resistance between 1 ohm - 900 ohms?
resistance came back ZERO. I assume that would mean replace the TACM or throttle body. correct? it doesn't even come back at 1 OHM which would most likely tell me the motor is shorted out. please confirm. thanks
Hotshot
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From: St Louis
Was the meter set to the RX1 scale? Did you check meter zero first by shorting the probes together?
If the scale is too high, very low resistances will still read "zero".
I can only go by what's in the manual...
If the scale is too high, very low resistances will still read "zero".
I can only go by what's in the manual...
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I tried setting it to the lowest scale and couldn't even get the meter to zero out when shorting the two leads. so I kept moving the setting until I did get the meter to zero out when shorting the leads and when testing the TAC, it zeroed out as well. I have to believe the TAC is shot. I ordered a new TB. should have it here in a few days and with fingers crossed, i am hoping that it fixes my problem.
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Well, after reading that document you sent... there are really only 3 options if I read right... Bad TAC, short in harness between TAC and PCM, and the PCM itself. At this point, the TAC is my hopeful as IMHO it would be the cheapest and easiest to fix. If it's the harness or the PCM, that would suck... and it would have to go to the dealer as that repair is more than I'm ready or prepared to deal with.
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