2013+ Ford Escape Forum banner

TPMS and TCU Issue

1 reading
2.7K views 11 replies 3 participants last post by  ditomathew  
#1 · (Edited)
I recently bought a used 2020 Escape Hybrid, and it's been a bit of a project. I've already replaced the battery with an H6 AGM and had the 60A high-voltage fuse then changed at the dealer after a breakdown.

I'm still dealing with TPMS and TCU issues and wondering if another dealer visit is needed. I have driven more than 100 miles after the fuse change. Car is at 175k miles, so out of warranty.
  • TPMS: The dash shows "Tire Pressure Monitor Fault" Should I try a relearn by deflating the tires?
  • TCU: I tried updating it with FORScan and a Vlinker, but it failed. Not sure it's related, but I previously bricked my Sync 3 with a map update (my mistake) and had it fixed by NaviUpgrade. FordPass doesn't work since I have it. Also I don't see an option to change the As Built values for TCU in the programming section.

Using FORScan, I'm seeing:
Image


Image


Image


Any thoughts?
 
#3 ·
1. I tried a TPMS relearn using a $10 tool I got from Amazon. But it didn't work. Let me try the other method of letting the air out.

2. I don't think I bricked it. Because it never showed me ESN since I have owned it. What are my options on TCU? I think dealer charges a lot to replace. Can dealer software unbrick it? Is getting a TCU from junkyard an option?
 
#4 ·
You've got a few issues with a donor unit.
You'll need to follow the reauth procedure in order to get the unit back to factory mode, there's and entire doc on the procedure over on Cyanlabs written by F150Chief.
If the TCU isn't giving you any config options the unit is bricked, a dealer cannot recover it with FDRS, its a unit replacement. List price on the part (LJ6Z14G229A) is just shy of $450 and while you can buy it from parts, it does not come pre-authorized. If you try going the used TCU path, you need an L series unit as the 2020MY+ Escape uses HS4 not HS3.
 
#5 · (Edited)
I have ordered a used TCU unit on eBay that matches the part number you mentioned.

For TPMS, I couldn't get them relearn. So I doubt if all the sensor batteries are dead due to the high mileage. Also is there any specific fuse for TPMS module that I can check on?

I currently have B124D:00-8A and B1182:00-8A codes for TPMS.
 
#6 ·
There's no fuse,
I'm thinking someone put in the wrong TPMS sensors.
ForScan shows the TPMS are being read, the pressure pressure is way, way higher than it's supposed to be.
If the physical pressure with a tire gauge is 33 lbs on all the tires the TPMS should be showing in ForScan at 227.5 kPa.
Your screenshot shows 150 psi which is why its throwing an error.
 
#7 ·
I did install new tires and aftermarket TPMS sensors (Moresensor 315MHz Signature TPMS Tire Pressure Sensor | NX-S079-SN-4) on my Ford Escape last week:

I've tried performing the TPMS relearn, but the system still isn't recognizing the sensors. Because of this, I'm starting to think the issue might be with the TPMS receiver module itself.

Continuing Questions:
  1. Do you know the location of the TPMS receiver module?
  2. Are there any specific fuses related to the TPMS system that I should inspect?
 
#8 · (Edited)
How did you perform the learning? Did you "wake up" your sensors with a tool (like EL-50449) or by letting out some air? Both work with original sensors, anyway (I did buy refurbished ones on ebay).
If you have keyless, the receiver is the same unit that communicates with your fobs - RTM, that is, the radio transceiver module (it sends information to the BCM). That's what stated in the 2020 workshop manual. You would notice it not working :)

After reading earlier posts of the thread: as jpohlman noted, the pressure is read, but it seems way too high. So it looks like an issue with the sensors. If you want to make sure, you could ask someone with working sensors and try to learn your car the other car's sensors (no need to alter anything in the other car, just use the tool to activate sensors when needed). If this works, you'll know the culprit.
 
#9 ·
The FORSCAN reading earlier was with old sensors that just got replaced. Now the sensors are MORESENSOR NX-S079-SN-4 and tried to do relearn by letting out air. But it didn't detect anything. So that's where I was thinking if receiver has an issue. Yes mine is push button start and originally I had the remote start, but that's not working ever since I got. I need to replace TCU for that is my understanding.
 
#10 ·
Escapes may have "remote start" using the key fob (pressing lock, then twice the special button to start the engine). Such Escapes have RTM - Radio Transceiver Module, which is located around where you can hide your glasses above your head.
The workshop manual says that for such Escapes RTM is used for communication with the TPMS, and this is the module that lets BCM know that the key is in the area or what are reads of the sensors.
For the "ordinary" Escapes, the manual says the TPMS communicate wirelessly with the BCM.
The TCU you mention works for mobile communication, so you can remote start from the app and, to my best knowledge, has nothing to do with TPMS.

If you have the key fob like this, and remote start does not work - well yes, that could mean your RTM is not working - but I have no knowledge about it, i.e. if this should show any additional errors. If you have the keyless/remote start Escape, you should be able to see the Radio Transceiver Module in Forscan.
If you have a key fob without remote start and your Escape does not have this function - TPMS communicate with the BCM, and you would know the BCM is failing from many other symptoms, I guess :) I am not sure if this has some antenna that could be disconnected.
In both cases you may have something that interferes with 315 MHz frequency - not sure, what could that be, though I do remember losing GPS signal when using some cheap camera :) So think about anything that is installed in the car and is not a standrd equipment. Maybe not a likely cause, but still possible.
But again, I believe you could try to train your car with some TPMSes that are known to be working, like in another Escape. That would eliminate issues with sensors.
Escape 4G sensors are "JX7Z-1A189-C" or (after the seller of refurbishes I bought): JX7T-1A180-A, JX7T1A180A, JX7T-1A180-AA, JX7T1A180AA, JX7T-1A180-BA, JX7T1A180BA, JX7T-1A180-EA, JX7T1A180EA, JX7Z-1A189-C, JX7Z1A189C, AG2SM3.
I bought here (but they were $104 then): Complete Set of 4 Genuine OEM Ford TPMS Tire Pressure Sensors Kit JX7Z-1A189-C | eBay
I don't see these numbers among OEM numbers for NX-S079-SN-4 (checking on Amazon), so I would still call TPMS issues the most likely reason.
 
#11 ·
TCU and TPMS have nothing to do with each other.
Just buying a used replacement TCU won't get things working for the remote start, you'll have to go through the re-authorization process listed in F150Chief's doc on the CyanLabs site.
TPMS units come in different frequencies 315mHz & 433mHz, the part number on the two 6/2020 Escape Ti Hybrids that I have here at the house is JX7Z1A189C/Motorcraft TPMS60 which is a 315mHz unit.
The unit you purchased is equivalent to F2GZ-1A189-A/Motorcraft TPMS61 and that part number is not compatible with a MY2020 Escape.