snarl95
Well-Known Member
Not getting 1.2 volts out of green wire at ecm. Suggestions?
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Crank no start
- Thread starter snarl95
- Start date
ak diesel driver
6.5 driver
did you leave everything plugged in and back probe? If so you need to check power and ground to the PCM
snarl95
Well-Known Member
Everything is plugged in. Had power to pin A1 and C1.
snarl95
Well-Known Member
No signal from the green wire. Suggestions?
ak diesel driver
6.5 driver
grounds?
Rockabillyrat
SlIgHtLy StUpId.
Next step is to get a scanner on it and make sure you have communication. Then check codes and data to see what's going on. The PCM needs inputs from pressure, temperature, and rpm sensors to control the PMD. If everything test good, and you tested all the power and grounds with a headlamp bulb. Then its time for a PCM.
snarl95
Well-Known Member
ECM was bad. Truck takes some cranking but fires. Throws a code and will check that. But it now runs. Will probably need to advance pump and set timing.
ak diesel driver
6.5 driver
As these trucks get older we're starting to see more PCM failures. Still not common though
snarl95
Well-Known Member
I'm getting DTC 19. Would that be because of the pump replacement or do I need to replace the crank sensor.
Rockabillyrat
SlIgHtLy StUpId.
Test for 5v and ground at the sensor. Then test for a signal from the sensor while cranking the engine over.
Good power and ground and no signal means you need a sensor.
Good power and ground and no signal means you need a sensor.
JMJNet
Recruit
If you changed IP and have not time it, then you may want to time it.
Erase the code after and see if it show up again.
The fishbyte and stall in your post #1 also happened to me when I had DTC 19.
At that time, it was intermittent so I just replaced the CPS.
I am not sure if replacing an IP can cause that code or not, though.
At any rate, make sure you get an ACDelco CPS if you decide to replace.
It is not easy to remove the CPS, though.
Erase the code after and see if it show up again.
The fishbyte and stall in your post #1 also happened to me when I had DTC 19.
At that time, it was intermittent so I just replaced the CPS.
I am not sure if replacing an IP can cause that code or not, though.
At any rate, make sure you get an ACDelco CPS if you decide to replace.
It is not easy to remove the CPS, though.
ak diesel driver
6.5 driver
Mixed bag on CPS replacement. If it will come out of the hole easily it's a pretty quick job. Mine took 10-15 minutes. If it doesn't or everything breaks off flush I've heard horror stories
Will L.
Well-Known Member
I believe in first brake cleaner and old toothbrush around the sensor until clean. Then soak it with oil and tap the metal bracket back and forth until you can get rotation by hand. Only then do you try prying it up any.
MrMarty51
Well-Known Member
Some other might chime and tell if this is a good or a bad idea.
I replaced the CPS on My truck while I had the front off of the engine, it was easy enough at that time.
I decided then that if I was ever to have to replace the CPS again, I would grind away the 1/16th or so off the PS mount bracket to allow the CPS to clear and make any further exchanges that much easier.
I replaced the CPS on My truck while I had the front off of the engine, it was easy enough at that time.
I decided then that if I was ever to have to replace the CPS again, I would grind away the 1/16th or so off the PS mount bracket to allow the CPS to clear and make any further exchanges that much easier.
snarl95
Well-Known Member
Replaced CPS truck fires up and runs without any codes.
MrMarty51
Well-Known Member
Did You need to loosen the PS pump mounting brackets to get the CPS removed, or, just grind a little off from it ?Replaced CPS truck fires up and runs without any codes.
snarl95
Well-Known Member
I just unbolt the power steering/alternator bracket and move it all out of the way.