Abs mid 136 sid 93 fmi 4

Here's that code from the Bendix EC-60 Manual. If that's not what you have, you're the one that made me guess. If that's wrong, let me know what kind of ABS you have. A year would help as well to narrow down what version.

SID 93 - PMV/TCV/Diff Lock Common
FMI 4 - Shorted to Ground

Verify no continuity between the CMN of all PMVs, TCV, and Diff Lock Solenoid and ground. Check for corroded/damaged wiring or connectors between the ECU and CMN of all PMVs, TCV, and Diff Lock Solenoid

 

Your truck has a bendix ABS system. Most common cause for these types of codes ends up being the 2 16 pin connectors in the left frame rail directly under the rear of the cab. the two connectors are very exposed to road spray and therefore tend to get penetrated with water. Hope this helps.

 

This is a problem with the Modulator/traction control common wire. Most likely corrosion in a plug or chaffed wire. It is not a sensor code, so wiring to axles is not giving you problems right now.

I do not know if you dash display will tell you what brand ABS. The easiest way to tell is by looking at the valves or modulators, they will have a name and part number on them. You most likely have a Bendix EC-60. There are a few versions, but SID 93 is universal to all of them.

 

may be bad wiring....

 

They are not wrapped in tape but are definitely tie wrapped. If you follow the large green trailer wire from the trailer socket down to the frame rail you will find the 2 16 pin connectors. ABS sensors, modulators and rear lights all go through the 2 connectors. Usually one is black and the other is grey.

 

Your fault codes is as follows.

PMV Common
Shorted to
Ground

Verify no continuity between the CMN of all PMVs, TCV, and Diff Lock Solenoid and
ground. Check for corroded/damaged wiring or connectors between the ECU and CMN
of all PMVs, TCV, and Diff Lock Solenoid.