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2013 Volvo VHD Oil Level Sensor 5vRef. Circuit
- Diesel_dude08
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1 week 5 days ago #92868
by Diesel_dude08
2013 Volvo VHD Oil Level Sensor 5vRef. Circuit was created by Diesel_dude08
Hello, the other day I pulled a 2013 Volvo VHD with a D13 engine into the shop for an open circuit code on the engine oil level sensor, upon testing I found the signal wire to be open. I found the open, soldered it, and confirmed the repair by reading the oil level on the scan tool and erasing the code. A few days later, the truck came back in for an unrelated transmission issue, and upon diagnosing the other problem with the truck, I saw my code for the oil level sensor had come back and was active. Confused, I tested my wiring again and found both my reference line and signal wire to be good via a halogen bulb load test. The sensor's resistance was in spec as well. But when I connected the sensor and back-probed it, I determined there was no voltage drop across the sensor. I had 4.617v in and 4.617v out. There appears to be zero amperage flowing through the circuit, but I have signal return voltage all the way back to the ECM pin, and the pin does not appear to be spread or pushed out in any way, shape, or form. There has to be something I am missing here. I can't imagine the ECM driver for the circuit is bad. After messing with the sensor for WAAAY too long, I eventually got it to show oil level full on the scanner and no active code, but when I checked, there was still no voltage drop, so it has to be a fluke and will most likely send the open code soon. The only strange thing is that the wire labeled oil level low" is actually the wire that had 5v on it, rather than return, and oil level High" was my return. I don't believe this would cause an issue, or why it is backwards, but I thought I would include this. If anyone can help me out, I would greatly appreciate it. I am just a confused high school co-op trying my best lol.
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- Chad
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- I am not a parts changer.
1 week 4 days ago #92871
by Chad
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right.
Replied by Chad on topic 2013 Volvo VHD Oil Level Sensor 5vRef. Circuit
It looks like you have proven the external circuit to be good.I tested my wiring again and found both my reference line and signal wire to be good via a halogen bulb load test. The sensor's resistance was in spec as well. But when I connected the sensor and back-probed it, I determined there was no voltage drop across the sensor. I had 4.617v in and 4.617v out... and the pin does not appear to be spread or pushed out in any way, shape, or form...
After proving everything external of the ECM to be good, there is not much left to point a finger at.I can't imagine the ECM driver for the circuit is bad.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right.
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