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Old 09-25-2020, 07:24 PM   #1
Epp
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ISC low voltage to ecm fault (oil pressure)

I have a 1999 DSDP with the Cummins ISC engine.
The dash gauge reads a steady 55 Psig when the engine is running, so the original sender was changed out to the binary switch sender. I am getting a check engine light and the fault code is saying low oil pressure voltage to the ecm. Are there two different pressure sensors on the engine? One for the gauge and one for the ECM? If so, are they both located on the passenger side above the starter? If there are two does anyone have the part number for the pressure sensor that feeds the ECM?

Any help would be appreciated.
Thanks,
Epp
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Old 09-26-2020, 02:17 PM   #2
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So you didn't replace the oil pressure sensor with the factory part. Now the ecm is looking for variable voltage that is not present (binary vs analog). And now you have a fault code.

Sure sounds line there are 2 oil sensors and you replaced the wrong one. Put the old back in and see if fault clears. Then unhook other sensor and see if gauge go to 0

Go to Cummins Quickserve online and get an account. From there is manuals and troubleshooting info you want. I say that as anyone turning a wrench on their own engine should have this data at their fingertips.
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Old 09-26-2020, 08:43 PM   #3
Epp
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The oil pressure sender was replaced sometime prior to 2008 before we bought the coach (this is my assumption since the oil pressure gauge reads 55 when it’s running or zero when it’s off. I am also assuming that they flashed the ECM when this changes made since it never threw a check engine light previously).

We have driven the coach for the last 11 years and I’ve never encountered a check engine light until last week.

My understanding is that the upgraded oil pressure sender acts like the old idiot lights did. When your pressure gets low enough the sensor grounds and give us a path for the voltage which triggers the zero reading on your oil pressure gauge.

With the fault code I am getting out of the ECM it leads me to believe there is a second oil pressure sender, installed on the engine, dedicated just for the ECM, but I have not seen anyone else mentioned that before. Granted I may have missed that information somewhere, or I am making a bad assumption.

I reread my initial posting and I was not real clear with the details, in hindsight.
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Old 09-26-2020, 08:48 PM   #4
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What is the fault code? Would you mind sharing you ESN?
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Old 09-26-2020, 09:42 PM   #5
Epp
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Quote:
Originally Posted by Wild Card View Post

Go to Cummins Quickserve online and get an account. From there is manuals and troubleshooting info you want. I say that as anyone turning a wrench on their own engine should have this data at their fingertips.
Thanks for the information on quickserve. I did not realize that was available. Registered tonight and have my account.

Thanks Wild Card
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Old 09-26-2020, 09:44 PM   #6
Epp
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141 - Engine Oil Rifle Pressure 1 Sensor Circuit - Voltage Below Normal or Shorted to Low Source

ESN 45752812
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