Just like the title states, I need to know what pins the coolant level sensor use on the ecu and if the ground is shared with other sensors.
I've replaced the sensor and checked the wiring near the sensor. There's part of my engine harness that previously was rubbing on the ecu connector and I have a sneaking suspicion that my issue is stemming from right there.
Need ecu pinout for 15 VNL 670 Coolant Level Sensor
Discussion in 'Volvo Forum' started by simonsocm, Jun 21, 2020.
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There is float inside the expansion reservoir with magnet which triggers sensor when level is low. Try to rotate sensor 90 degree, sometime it's magnet position will set false signal. -
Thanks a ton! I didn't know the angled sensor trick but that may have been my issue. If it comes up again though then this picture will come in handy.
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I'll be replacing the expansion tank and hoses for it this week. That's not the issue but I've got a mild leak now too. I recently had this pop up again and unplug the sensor. Stop engine light still came on. So now I get to unplug the ecu and start chasing wires. Yay.
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The issue isn't an open, it's an intermittent short. Unless I'm thinking incorrectly the float closes the circuit and then the dash shows extremely low coolant and a stop light. If I'm thinking correctly about it, then a paperclip in the plug would pull up a stop light constantly. I'll check that first and if that's the case then I may unplug the ecu and depin one of those wires for the meantime til I can figure it out.
Snailexpress Thanks this. -
Did you check wire connection inside the plug? To disassemble plug you need special tool. https://www.amazon.com/MENKEY-Termi...5BFRRCE5WXN&psc=1&refRID=Y1AG8W05D5BFRRCE5WXN -
Well I tested another sensor, there's two spots that a magnet reacts to. Left alone it's at 2k ohm, on the higher mark it's at 6k ohm (add coolant mark I'm assuming), lower mark near the bottom of the sensor it pulls up 750 ohm. This is using a dirt cheap eBay sensor so I'm not 100% sure that is what it's supposed to be like. I think I'm just gonna slap a 4k ohm resistor in the plug for now to see if that'll get me by for now til I have another week off to troubleshoot it.
BTW thanks for that link, I've got a Deutsch connector kit put not anything else so that'll help immensely.
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