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I've scoured previous topics on here regarding this matter and discussed this in a previous post I kinda hyjacked a while back. I need help with one issue.
I recently purchased a 2006 DF140 with 428 hours. Motor cranks and runs great for about 15 minutes then I get the warning lights, beeping, and motor drops to below 3000 rpms. I can shut her down, let it sit for a minute and crank it back up and run fine for a while before it does it again. I purchased Suzuki diagnostic software and it reflects 14 previous instances of Gradient Overheats (no thermal overheats). As a precaution, I went ahead and changed impeller (old one looked great and put out a solid stream of water) and I replaced the anodes. Previous owner said he had dealt with an occasional overheat issue, but not very frequently.
My online research suggest that Sensors will only throw a Code to the ECM only if the sensor has gone bad, but not if it is working, albeit erratically (someone correct me if I am wrong). Additional online research suggests that a common problem that arises with these motors and causes a gradient overheat is erratic fluctuation in the Exhaust Manifold Temperature Sensor of which there are two of them on my motor. I could easily just replace both of them and (hopefully) solve my problem, but my preference would be to test them individually and identify whether or not one of them is performing erratically. Is there a simple way to test the these sensors, and if so, can I do it with a simple ohm meter or do I need something else? I have also heard of measuring manifold temperature, but I don't have an IR gun to take these temps. Any other suggestions would be appreciated.
I recently purchased a 2006 DF140 with 428 hours. Motor cranks and runs great for about 15 minutes then I get the warning lights, beeping, and motor drops to below 3000 rpms. I can shut her down, let it sit for a minute and crank it back up and run fine for a while before it does it again. I purchased Suzuki diagnostic software and it reflects 14 previous instances of Gradient Overheats (no thermal overheats). As a precaution, I went ahead and changed impeller (old one looked great and put out a solid stream of water) and I replaced the anodes. Previous owner said he had dealt with an occasional overheat issue, but not very frequently.
My online research suggest that Sensors will only throw a Code to the ECM only if the sensor has gone bad, but not if it is working, albeit erratically (someone correct me if I am wrong). Additional online research suggests that a common problem that arises with these motors and causes a gradient overheat is erratic fluctuation in the Exhaust Manifold Temperature Sensor of which there are two of them on my motor. I could easily just replace both of them and (hopefully) solve my problem, but my preference would be to test them individually and identify whether or not one of them is performing erratically. Is there a simple way to test the these sensors, and if so, can I do it with a simple ohm meter or do I need something else? I have also heard of measuring manifold temperature, but I don't have an IR gun to take these temps. Any other suggestions would be appreciated.
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