05 tundra 4.7 deceleration sensor

Need to know where deceleration sensor is located on 05 tundra to fix c1244 code

 

A quick Google search turns this up, which makes me think one of your wheel speed sensors is bad. But when I dig hard on that code, I get "VSC Actuator" and "Yaw Rate Sensor" as the typical cause. In 2nd gens, the yaw rate sensor is under the center console, not sure about 1st gens. Does your truck have VSC by chance?

 

I thought it was embedded in the spindle? Isn't it the same as the ABS sensor?

 

I’m getting open or short circuit in the deceleration sensor circuit code

 

Maybe Item 89441A it says that is a deceleration sensor. Hope it helps

 

The numbers in the exploded aren't helpful; you can't go to parts.toyota.com and lookup based on that number; that short number is keyed to the parts list of the specific page containing that diagram.

I recognized the picture from the VSC area of the parts catalog. Here: https://parts.toyota.com/a/Toyota_2...-2WD/_52016_6705947/ABS--VSC/841420-8414.html

According to Toyota the part is no longer available (discontinued):



But the OEM part number is 8944034040 which may also be stylized under the old part numbering style of 89440-34040 and its parts page is here.

Only place I could easily find selling a new one is in Lakeland FL and is looking to be $313.77 before tax. This is one of those cases where I'd contact www.JapaneseTruckDismantling.net to see if they can help.

If it were me, I'd download a copy of the Factory Service Manual to investigate how to debug the deceleration sensor (if that info is there) and its exact location. From the picture, it looks to be under the center console, but that's the best guess I can give. I'd then try to find a junkyard within an hour that had an '05 or '06 and pull a used one.

But that's just me.

 

Oh and there's apparently a big process or procedure to do when you replace the yaw sensor or deceleration sensor. Someone posted a PDF you can use that shows the process on the TS forum over here: This may be worthwhile also?

https://www.youtube.com/watch?v=KfKsaxzbT1I

 

Your code should tell you which wheel the sensor is bad on. Check youtube for the procedure to check the harness first. By all means don't turn the ignition on with the sensor or any part unplugged it will set off the light. Also check online for toyotapartscheap and you will find several dealers that sell parts cheaper. My rt rear was way less that the $313.00 even paying shipping. These are original toyota parts. Don't buy the Chinese junk wasted $30. for nothing.

 

Okay everyone I know I’m a year late but for the sake of getting it right, I made sure to document my findings as far as yaw rate sensors and deceleration sensors go.

So I have a friend that has a bunch of the first gen. His dads property looks like a tundra grave yard (sorta). So they rebuild tundras for themselves to drive .

So the story is this: my buddy bought this tundra that was burnt @ the engine compartment/firewall. 2WD, normal interior and nothing special. He replaced the ABS unit to the normal version (mounted on passenger wheel well) from the one that was firewall mounted on driver side originally. And also swapped some wiring harnesses (not realizing some of the wiring would be missing)
So, he finished the truck and had ABS light on, E-brake light on and some other issues. He’s driven it for years this way until finally I asked about them issues and offered to look into the problems.
I found that the deceleration sensor is that physical sensor shown in the parts explosion above, under the passenger seat right when you pull up carpet you’ll see it (if you have it).

This is the decel sensor. You have this sensor if your truck doesn't have the curtain airbags. If you have the curtain airbags the yaw senosr will have this sensor inside of it, at least this is what makes sense to me after working on this truck
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Location of sensor under passenger seat, immediately after pulling carpet up
IK2 Connector at right side kick panel where this decel sensor plugs into. The wiring colors here show that the decel senosor wires are missing (Y,B,G,GR) in the correct pin locations, although you see the Light green, blue wire in the center, and Black/Red that is where the YAW sensor wires.


This is how the opposite side (female side) of this connector should look if you have the decel sensor but not the YAW. Note that the light green and blue in middle are not there.

These two are just a comparison of my 4wd tundra and Tims 2wd tundra. As his is missing the decel sensor wires (which he needed after changing the ABS to pass. side.


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The following 2 images comparing the differences of how the ABS units look. As you can see the original was on driver side. Which is apparently a super rare setup and costs like $500 to buy used.

Comparison of EWD's for DC truck VS non-DC. Note that the yaw rate/decel sensor wires do not run through IK2 connector in non-DC trucks.




location of IK2 connector and pin out




This image shows that the wire going from Decel sensor to ABS unit now is now a 3 piece wire..Goes into IK2 @ kick panel, IJ4 (junction @ firewall) then finally goes to the ABS connector through the firewall.
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This is the shielded cable that holds the 4 wires connecting signal from IK2 to IJ4

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The following is photos of IJ4 right at the firewall/corner of the cab. This is where a cable was also missing for his ebrake sensor. Yellow/black wire pin 18 from IJ4 was missing so i took the 4WD yellow/black wire that i know connected back to the combination meter and butt spliced it right after the junction so i didn't have to run any cables or mess with any splicing at the tiny wires @ comb. meter.

This is after i had installed the missing cable from IJ4 to IK2. Very strange that toyota left this one out!


The image below is showing the 2 connectors where the 4WD ECU would connect. I used 2 of those wires to rig up the ebrake sw signal to cluster (aka combination meter) the 2 connector below the stud with a yellow circle around it in the image.


OKAY..HUGE POINT HERE!! When you're looking through the EWD's for your tundra pay attention to the fact that if you have the ABS unit on passenger side, only pay attention to the device that is labled "ABS ECU with Acuator" not "Skid Actuator with ECU" some of the wiring is the same but others different..dont be like me and spend hours frustrated because you think half of the ABS plug is wrong!! I'm going to assume that the "skid control" device is the one that mounts on the firewall where the brake booster normally sits.

The following is the ABS plug pinout. BE aware that the pin out shows you the orientation of the plug as if you have disconnected it from device and are looking into the connector face..It was a bit tricky at first..and would forget sometimes. what helped was literally taking the image and printing it out so when i stick my needles to test for broken wires, I know exactly which ones i need to plug into.




Combination meter plug cable wires. If you're looking at the EWD's for any device that has more than 1 connector the pins will be label "A" "B" etc.with a pin number. At the combination meter, the 40 pin connector (larger one) is connector A, B is the 24 pin connector. So basically i looked at my truck and noticed that pin 1 on connector A was a White/black which is ground, and pin 2 was a yellow/black (ebrake sw signal). Instead of butt splicing anything i just depinned connector B and removed 2 wires that signal 4 LO, 4 HI on the cluster. Tims truck doesnt have 4WD so i plugged the yellow/black signal wire into pin 2 and pink/black into pin 1, locked it all into place and then @ the 4wd harness at right kick panel Put a jumper from Black/white wire to pink/black. Boom, now the ebrake indicator works as it should, i just have to put a permanent jumper wire at the 4WD ecu connector.
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connector B for cluster on my truck
connector B for cluster on my truck flipped for clear view of wire colors into pin locations​

This is Tims truck.. this is connector B at the cluster.. note he has pins 1-3 (blue/red- pink/blue) as the wires for VSC..which im assuming was the option with the original ABS unit. The wires for pins 4 and 6 are missing as i pulled them out to use in connector A.

 

Got a pic of where it's located under the seat, for posterity's sake?

 

@shifty` Im still working on the huge post...i just loaded all the images up, need to re-organize them and put comments in betweeen for a more fluid read for anyone dealing with this now or in the future. view the updated images i just posted. Im still typing out what all i did to this trucks wiring to get it back to "oem" spec and working good.

 

But it’s right here if I recall.

 

tip on formatting: If you go to the left-hand side of each image then click this button:

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It'll indent the picture to the right, so it makes it looks like less of a wall of text. If you need to bust back out of indent, like you get stuck in indented mode, the button to the left of it indents you one step left. You can indent as many times as you want in any direction.

I generally tend to use this trick in the technical documentation I've got to write regularly at work (it's why I type @150mph), and folks reading it often comment about how much nicer it is to break up text and identify sections.

 

https://youtu.be/XufgDxW1M5g

I made this for y'all. And maybe some who search this issue on youtube. I know its garbage if you just watch the video alone, but i think for everyone on tundras.com this may go hand/hand with my post (that im still working to get organized)