Mackpro

The power and grounds are in the “B” connector which is the bottom connector on the ecm. Pop the cover off to tap into the wires .

Most of the time when the engine ecm dies it’s done and doesn’t ever start/ wake up again. However I have had a couple randomly die like yours. To figure it out I put a amber trailer marker light in the cab and grounded it to somewhere in the cab and ran the other wire to the power supply wires at the ecm connector. When light on I knew I had power at the ecm. Then go for a test drive and see what happens. I’ll post pin locations later

208 degree coolant temp should equal 257 degrees oil temp according to Mack. The max is around 270 best I remember

The fuse box down by the clutch pedal is know to get water in it . Do much so that they had a major recall on several thousand units from 2008 to around 2012. Sadly the CTP and CXP were not part of this recall even though the design was basically the same as the CXU,CHU and GU trucks. However the CTP/CXP fuse panel has a different part number than the 2008 and up trucks. Pull a couple of the bottom relays and if there is white crusty residue on the pins then water has been in the fuse panel and possibly needs the be replaced

Best pic on the Internet I could find . I circled it .

I’ll try to get a pic of the problem connector. It’s under the hood around the foot valve area .

The dash cluster is not needed for the truck to run and drive. Drove several around the lot with cluster removed., The 04 emission MP7 in the CTP and CXP was a a little different as it was only made for only a little more than a year. The wiring is a little different than the 2008 and up MP trucks. Power to the engine Ecm comes from the fuse panel by the clutch pedal. Fuse 38 and wire # is F38A2. Power comes through the top connector on the outside of the fuse box , PIN number A . This connector is called the EPDME. It then goes through connector CIEC pin A , this is a 16 pin connector around the foot brake valve area. This is the usual problem area. With the engine running. Shake and twist this connector.

The CXN/CHN cab is also 6” longer than the CH and CX cabs from the 1989 through 2003.5 years. It seems the “bigger “ truck drivers could not slide the seat back far enough. Oddly enough the old short CX/CH cab was brought back into production for the MD series of truck that are being made today.

Thank you sir!

Happy Birthday! I think we have something else in common other that working on Macks,

You can get new injector harness ends and pins and repair your harness . Bulletin attached injector harness.pdf

Here’s the rear synchro housing kit with hub .

When I went to the M-drive/I-shift school. I was shocked when I got to pull the top cover (shift control housing) off. Wasn’t really much inside there

You can get just a synchro kit or the complete back housing pre-assembled with synchro installed. The hub bolts to the main box best I remember and it’s the only thing on the main box( main housing) that you have to change on the main box. It’s been several years since I’ve done one however. I did once have the hub break loose from its mounting bolt tabs and cause quite a mess. Shockingly they were still driving it.

Here is the bulletin Mdrive F GU series.pdf

https://static.nhtsa.gov/odi/tsbs/2015/SB-10082931-0699.pdf Only info is more repair info

Yours falls into a service bulletin. Looks like probably the ribbon harness inside the transmission. I’ll try to find the bulletin and attach

I’ll see if there is anymore info on this but the bulletin did not go into detail.

Very possible. No stainless cup option on the 04 emission MP7 that came in the CTP/CXP. Copper cup installation might use different tools and procedures than the stainless. Been awhile since I did any copper ones.

Here is the repair options https://static.nhtsa.gov/odi/tsbs/2021/MC-10189847-0001.pdf

That bulletin sends you to SNM 15-002b on repairing. I can’t seem to locate yet .

The bulletin on the 6th to 7th grinding noise.