93 ECM rebuild
Thread Starter
Drifting
Joined: May 2003
Posts: 1,979
Likes: 48
From: Lakeport CA
93 ECM rebuild
Anyone try a re-solder of ecm main board on their own? '93 was doing the classic security flash once & then ASR light on. After shut down would be the crank, but no start. Read a number of members have had this happen.
My tech2 would show:
CCM errors H 41 - ECM Serial data loss & H74 LED Dim output open or short to grnd.
EBCM H 72 Serial data loss.
I unplugged the EBCM to eliminate it from making noise on the bus & the CCM errors still come back, although not the ASR/No start issue.
I pulled the ECM, & close exam under my lighted magnifier showed nothing obvious but I went ahead & re-flowed solder on a bunch of spots that seemed light on the factory solder job.
Back together & errors have stopped but weather has turned wet/cold so will be awhile for a real world hot test.
TIA for any feedback.
M...
My tech2 would show:
CCM errors H 41 - ECM Serial data loss & H74 LED Dim output open or short to grnd.
EBCM H 72 Serial data loss.
I unplugged the EBCM to eliminate it from making noise on the bus & the CCM errors still come back, although not the ASR/No start issue.
I pulled the ECM, & close exam under my lighted magnifier showed nothing obvious but I went ahead & re-flowed solder on a bunch of spots that seemed light on the factory solder job.
Back together & errors have stopped but weather has turned wet/cold so will be awhile for a real world hot test.
TIA for any feedback.
M...
Drifting
Joined: Jun 2020
Posts: 1,355
Likes: 396
From: Northwest Ohio
I went with SIA. I have a decent soldering station with fine tip point I could have gone after it myself but decided to let them have a go at it since they do a lot and know what to look for. Plus there is a warranty….
There is nothing magic about this though, good for you for tackling it. If you got the right joint/connections you should be gtg. Just make sure it is clean and re conformal coat it if it was coated (?).
There is nothing magic about this though, good for you for tackling it. If you got the right joint/connections you should be gtg. Just make sure it is clean and re conformal coat it if it was coated (?).
Thread Starter
Drifting
Joined: May 2003
Posts: 1,979
Likes: 48
From: Lakeport CA
Just a quick update... so, not 100%... LED error has gone away without returning now but the serial data error(s) still persists after a warm up. CCM looses serial connection to ECM & ABS just looses serial. Really don't want to pull CCM, such a pita to get out.
Going to call a few places in the AM for current quotes/advice on which or if both units should be serviced.
Going to call a few places in the AM for current quotes/advice on which or if both units should be serviced.
