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ABS questions?

Tiny
GOODY1966
  • MEMBER
  • 2002 DODGE RAM
  • 349,300 MILES
Just bought the truck listed above1500 5.9L, 2wd, automatic, 4 dr, 6ftbed. ABS and brake light lit on dash when I purchased the truck, figured it wasn’t going to be this tough on getting the info I need. So, the and brake light on, nothing feels out of the ordinary with brakes that I notice cause truck is new to me. I scanned the computer with my three code scanners, and I have no codes. Took to auto store and used their scanner and no codes. I started cleaning up the connections at fluid reservoir, connection on and module and the abs connection in rear on top of pumpkin, I then noticed a sensor on left front wheel and none on the right. So, all is good so far except the front wheel sensor is folded up and wire tied and hangs there, so from what I’m thinking is if it’s 2wheel ABS, is it the wrong bearing hub on the truck or is the incorrect and module on the truck? I looked for six days for where the speed sensor goes, there is nothing hanging, nothing cut off in the harness anywhere, what I seen online there should be the connector for it attached and behind the wheel well. It’s not there. Took the well out to see if it went something I can’t see. , There is nothing to attach the speed sensor to. My abs module is a 2wheel wheel abs module so there two brake lines and one connector from harness in it. At the auto store there was that module and a. ; Wheel and module, the four wheel and had two connectors on it. One for harness I’m guessing and one for the speed sensor I imagine. So is my truck. 2 or 4 wheel abs? I got three wheels covered. Not sure what I got, to find out if sensor wire goes somewhere or take the hub assembly off and look for the cause of lights somewhere else. Also, the parking brake had a electrical connector on it down under dash, there is no connector that I can find that plugs into it down there. There is a remote start and alarm wired in I believe. Is that where any of my missing wires could have gone, I’ll takes pics tomorrow if needed. Let me know your thoughts on this. , Thank you
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Tuesday, July 30th, 2024 AT 4:48 PM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

Either the vehicle has rear ABS or 4-wheel ABS. If there is a wheel speed sensor on one of the front wheels, the other front should have one too.

I attached the wiring schematic below so you can see the layout.

As far as the scan is concerned, you need to have a scanner that can read all codes from the can-bus. I'm not sure if that is what is being used or not.

Here is a link showing how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

As far as the remote start, I doubt it is related.

Let me know.

Joe

See pics below.
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Tuesday, July 30th, 2024 AT 7:37 PM
Tiny
GOODY1966
  • MEMBER
  • 58 POSTS
Okai, just lost what I was typing so I’m sum this quick. Sorry for the late response. Dodge did use just one wheel sensor up front on some models. So, I’m just putting hub in without because there nothing to hook it to anyway. Now what is new are calipers, pads, rotors, ebrake shoes, master cylinder, brake booster and a few lines broke and I replaced them as well. Everything was worn and shot. I guess 349,000 miles do that. I think the module bad but still uncertain because the pedal still not correct. Has a lot of travel and doesn’t return all the way. It was better before all replaced. Thought air, and could be. I been bleeding it over 7 days. I did vacuum hand pump, gravity bled, air bleeder and old fashion 2 person pump the pedal way. On to 3 gallon of fluid. I’m thinking master cylinder not correct. It’s suppose to work on my 2002 dodge ram1500, 2wd, 5.9, 4dr pickup truck. But there was a difference I’ll sent pics hopefully, the plunger on new one has an opening a good inch wide, old one has more sold if shaft with 1/4!Inch hole in center. Could this be my problem of not much pedal? Or still air?
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Monday, November 25th, 2024 AT 6:38 AM
Tiny
GOODY1966
  • MEMBER
  • 58 POSTS
Fist pic what I was sent, second pic mor like what came off vehicle.
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Monday, November 25th, 2024 AT 6:39 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

They certainly are different. When you purchased it, did the seller know if it was a 5.9L gas engine and not the 5.9L Cummins diesel?

Joe
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Tuesday, November 26th, 2024 AT 9:19 PM
Tiny
GOODY1966
  • MEMBER
  • 58 POSTS
It’s 5.9 gas engine. The seller had to of known about the fuel type. The fluid was dark and with all it needed I changed the fluid but still have the issue. I cannot find the master cylinder like the one in it. I see them online at auto stores but when I go they have the one I’m not looking for. Could it be a revised model? Here the kicker, 2 nights ago I cleaned the old one the best I could to put that back on to see if it was my pedal problem not being normal. I put it back on and it did not fix the pedal travel but the abs light and brake light on dash that been lit since I purchased the truck and the prior owner said the lights were on for a few years finally went out. On dash. So hopefully that was it and not in the wiring that’s been cut into under dash or the problem of the wheel sensor that’s on with nowhere to be hooked up. I’ll keep you informed if it comes back on, I hope to God it doesn’t so I can move on to the new front suspension in the back seat waiting to go on.
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Wednesday, November 27th, 2024 AT 4:03 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

The only other thing I can think of is if the vehicle is a late or early production vehicle. Often, manufacturers will use up leftover parts from the previous model year before changing to the new design.

On the other hand, they have to use the next year's parts if they run short before ending a model year.

Do you have a picture of what you removed? Could you upload a picture of it for me to see? Also, have you checked a master cylinder for a 2001? As far as 2003, that is when the Hemi was introduced in the truck. Chances are that one will be different.

If you look at the picture below, I attached the OEM part number as identified in my manual. See if what you got crossed to that number.

Let me know.

Joe

See pic below.
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Wednesday, November 27th, 2024 AT 8:58 PM
Tiny
GOODY1966
  • MEMBER
  • 58 POSTS
This morning my ABS light came back on and stayed on. What a bummer. The first pic is what is needed. The second pic is mine that I took off but put back on. There pic is what everyone has that they keep giving me. I was thinking maybe it was redesigned or something. Even the pics on the store's websites show mine that I have but end up sending or having the other one. I don’t know where the OEM number would be located 0n the cylinder. I thought they used a sticker on them to identify the brake master cylinder and this one does not have one on it.
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Wednesday, November 27th, 2024 AT 9:08 PM
Tiny
GOODY1966
  • MEMBER
  • 58 POSTS
This morning my abs light came back on and stayed on. What a bummer. The first pic is what is needed. The second pic is mine that I took off but put back on. There pic is what everyone has that they keep giving me. I thinking maybe it was redesigned or something. Even the pics on the stores websites show mine that I have but end up sending or having the other one. I don’t know where the oem # would be located 0n the cylinder. I thought they used a sticker on them to identify the brake master cylinder. And this one does not have one on it.
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Wednesday, November 27th, 2024 AT 9:08 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

Looking at the one you removed; it appears the input cylinder where the push rod would be is shorter. If the new one is longer, I suspect it will cause the brakes to be applied constantly.

Please forgive me. It is so hard to make a solid determination by looking at pictures. However, now that I see what you have, I do see the difference.

Here is what I recommend. Call NAPA and provide the OEM part number I gave you and ask if this is the correct part or if they sold you an updated one. Or, if the one you need is even available.

Also, the part number in pic 1 is for a 3/4 ton vehicle. I went to an AutoZone page and found what I think is needed. It is their part number NM3080. See pic below and let me know if that appears correct.

Let me know what they tell you.

Take care and Happy Thanksgiving.

Joe

See pic below.
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Wednesday, November 27th, 2024 AT 9:16 PM
Tiny
GOODY1966
  • MEMBER
  • 58 POSTS
The Napa pics were just to show you difference I cross referenced the number you supplied, and AutoZone was on it for nm3080 and I remember that was what they gave me but looked nothing like the one I needed; Amazon was same way with what they sent. Happy thanksgiving to you as well.
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Wednesday, November 27th, 2024 AT 9:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Compare where the pushrod goes into the rear of the master cylinder. See if it seats once it is in. I guess it could be an updated design. But it certainly looks different.

Let me know.

Joe
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Wednesday, November 27th, 2024 AT 9:43 PM

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