trackspeeder
Stone crusher.
A bad CPS will cause a no start, no tach situation. The fuel pump, WTS light and, glow plugs will work.
Pcm swap???
- Thread starter 90f250
- Start date
A bad CPS will cause a no start, no tach situation. The fuel pump, WTS light and, glow plugs will work.
90f250
Full Access Member
That's what I had thought which is why I havent replaced it yet. The odd part is that my cig lighter works, but no wts,fuel pump, or tach.. and all 4 are on the same circuit. However my "power point" doesnt work. Granted I really dont know that it did before these issues so who knows
Garbage_Mechan
Garbage Mechanic
I would give Diesel Technology Chattanooga a call. Bet he has some ideas.....
90f250
Full Access Member
greenskeeper
Full Access Member
As per your other thread, what wires were run to the gem by the previous owner? Maybe it was more than just the 4x4 control?
Have you tried removing the gem and seeing if it cranks with only the PCM installed?
Have you tried removing the gem and seeing if it cranks with only the PCM installed?
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90f250
Full Access Member
The only wires they did were for the 4x4 switch. I have not tried without the gem, however it does turn over just fine I just have no start
90f250
Full Access Member
Maybe another dumb question... but would the new pcm need "programmed" to my truck? I didnt think they did in e99
greenskeeper
Full Access Member
as long as it has the correct DPC code then no.
90f250
Full Access Member
90f250
Full Access Member
Well, as of right now, it's got new pcm, icp, cps, idm, under dash fuse box, all relays and fuses good, "correct" gem, new ignition switch as well. I dont want to keep throwing parts at it. But I honestly cant find any damn thing wrong with it. I've also cleaned every ground wire connection I can find with a wire wheel. Again, it cranks just fine, but no wts, fuel pump, or tach movement. Check engine light comes on and stays on also. Fuel bowl heater unplugged and ebpv unplugged as well as those are the 2 that will stop the computer from working. Doesnt make a difference. Not sure where to go from here
79jasper
Chickenhawk
I feel like it has to be wiring.
Have you tried pulling codes lately?
Sent from my SM-N960U using Tapatalk
Have you tried pulling codes lately?
Sent from my SM-N960U using Tapatalk
90f250
Full Access Member
Computer wont connect to it still. Its gotta be wiring somewhere
90f250
Full Access Member
Aannnnddf the check engine light stopped working now too.. so apparently it is for sure a wiring issue
90f250
Full Access Member
What are the 3 or 4 relays way behind the radio on the firewall dang near? I've got my whole dash apart right now tracing wiring and came across these. I thought the ones to the left of the radio were the ones everyone kept talking about near the radio but I apparently have 2 sets by the radio.
