Engine/Transmission (1994 - 1998) Engine speed sensor questions.

[DWeaver]

I have replaced the stock damper with a fluid damper. I also soldered in the aftermarket connector that came with the fluid damper to the wiring harness and a new ESS from cummin's.

I have no alt or tach. I set the gap at . 050. I have tested the leads from the PCM and I am getting a reading of 5. 13 volts at both the 5 volt supply wire (circuit K6) and 5. 13 volts at the signal wire (circuit K24). this is off the connecter on the PCM side.

I do not believe 5 volts should be at both circuits?

I tried testing for continuity on the ESS and did not get a reading.

My Service manual says for proper testing I have to reference "the proper powertrain diagnostics manual". I do not have that and do not know where to even look for it.

Would anyone be able to tell me the testing procedure for the ESS and corresponding circuitry?

I also do not know which wire on the ESS is the K6 circuit wire. There are 2 black and 1 black with white tracer on it. I was very anal about cutting one wire off the old connecter at a time and soldering it to the new one in the same position. Does not mean I did not switch a wire.

Would anyone have the wiring schematic for the ESS?

My apologies for being long winded, I am just anxious to get the Bleeping thing running, correctly.

Thanks in advance for any help, much appreciated.

Dawayne

 

[ata]

Service Manual Spec's for engine speed sensor, are set at . 049 to . 051 gap. Use brass non-magnetic feeler gauge. You might have the sensor set to close.

 

[DWeaver]

I tried testing for continuity on the ESS and did not get a reading. My Service manual says for proper testing I have to reference "the proper powertrain diagnostics manual". I do not have that and do not know where to even look for it.



Would anyone be able to tell me the testing procedure for the ESS and corresponding circuitry?

Found out that you need a oscilloscope to test the ESS.



I have also spent the day going through wiring diagrams and doing continuity tests on my harness. All seem to check out.



I also checked out the volt readings on a '94. The signal wire has . 13 volts with key off, the supply has 0. 00 volts with key off. With key on signal wire has 4. 95 volts, and supply has 8. 65 volts.



My '96 has . 21 volts on both wires with key off, and 5. 12 volts on both with key on.



Should I be looking at getting a PCM?





Thank you, ata. I had been searching for that info.

 

[GAmes]

I'm assuming you didn't have the problem prior to installing the harness that came with the Fluidampr.



When I installed my Fluidampr I did not use the connector kit. I extended the factory harness on the engine by using three different color 16 gauge wires. Now if I need to replace the ESS it will be a simple plug and play with the new sensor.

 

[DWeaver]

I'm assuming you didn't have the problem prior to installing the harness that came with the Fluidampr.



When I installed my Fluidampr I did not use the connector kit. I extended the factory harness on the engine by using three different color 16 gauge wires. Now if I need to replace the ESS it will be a simple plug and play with the new sensor.

Yeah, I wish I had that much foresight. :{



I truly do not know if the problem is before or after. The stupid pick-up did not run when I received it. Previous owner said it worked, P. O. also did the damage that I have rebuilt.

 

[GAmes]

I also do not know which wire on the ESS is the K6 circuit wire. There are 2 black and 1 black with white tracer on it. I was very anal about cutting one wire off the old connecter at a time and soldering it to the new one in the same position. Does not mean I did not switch a wire.



Would anyone have the wiring schematic for the ESS?

I came back and re-read your first post and this caught my attention. The three wires are gray/black tracer k24 circuit to the pcm A8, violet/white tracer k6 circuit 5v supply pcmA17, and black/light blue k4 circuit ground

In my '97 fsm the schematic is in 8W-30 fuel/ignition systems, page 8W-30-29



Your '96 I believe is similar if not the same.

 

[DWeaver]

I came back and re-read your first post and this caught my attention. The three wires are gray/black tracer k24 circuit to the pcm A8, violet/white tracer k6 circuit 5v supply pcmA17, and black/light blue k4 circuit ground

In my '97 fsm the schematic is in 8W-30 fuel/ignition systems, page 8W-30-29



Your '96 I believe is similar if not the same.

Yep, it is the same. The wiring harness side has the color coded wire. The pigtail on the ESS only has 2 black and 1 black w/ white tracer.



Again "foresight"!! If I had done like you did I would not be in this quandry I could point straight at the PCM and go from there.



I did get access to a '97 to check volts on the k6 and the k24 circuits. So I hope to have a resolution to this problem today. Fingers crossed.

 

[GAmes]

Yep, it is the same. The wiring harness side has the color coded wire. The pigtail on the ESS only has 2 black and 1 black w/ white tracer.

OK, I'm a little thick sometimes. I just looked at a replacement I carry around, it has one green, one red, and one black wire. I'm wondering if it is the right one:-laf

 

[GAmes]

Now that it is daylight I was able to check the ESS on the engine, which is the original. It too has a red, green and black wire. Is it possible you have the wrong part? If it would help I can send a pic of the ESS where the wires enter and the connector so that you might determine pin position.

 

[DWeaver]

Now that it is daylight I was able to check the ESS on the engine, which is the original. It too has a red, green and black wire. Is it possible you have the wrong part? If it would help I can send a pic of the ESS where the wires enter and the connector so that you might determine pin position.

Thank you GAmes. Your assistance has been much appreciated.



I used the CUMMINS 3924432 SPEED/CRANK POSITION SENSOR ('94-'97) that I bought from the Cummins dealer.



In checking out the '94 5. 9 the sensor had the colored wires. The '97 had the black wires, with a '98 style connecter. Go figure.



The '97 PCM tested the same voltage as the '96.



I finally found out what I did wrong. I cussed and moaned, tested and retested and figured I was going to have to buy a new sensor and reattach my OEM pigtail to get the job done. So if I fried the sensor that was on there no big loss. I took jumper wires and started switching wires between the connecter.



The sensor with 2 black and 1 black with white tracer connects thus:

Black with white tracer is GROUND.

The 2 black wires are signal and supply.

I can not give a good explanation of which black wire is which. Have to jump the wire and see what makes that tach work. It did not fry my sensor having it all backward.



Long story short I now have tach, alt. and a pick-up I now have to learn how to drive. Oo. Oo. Oo. Oo.



Story will continue here- https://www.turbodieselregister.com...nsmission-1994-1998/232576-my-96-rebuild.html