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SW MN | If the issue is with pounds:
Check the raw and zero flow and lbs/sec readings under the Info | Yield Monitor/Mapping | Diagnostics | page 2. Look to see if there is a reading under lbs/sec. Raw and zero flow should be around 23000(+/-1000) when no crop is going through the machine. When harvesting, zero flow should stay nearly the same number, and raw flow should get somewhat bigger (by a few thousand). The difference between these two numbers is what gets converted into pounds.
If the zero flow drops when combining, there is probably a ground issue in the mass flow circuit.
If the raw flow does not increase, check the installation of the mass flow sensor and the wiring to it per the instructions below.
If yield and moisture are zero, either the mass flow plate is not free to move, there is a wiring issue to the mass flow plate, or the mass flow plate is faulty. Proceed with hardware and wiring checks outlined below.
If the pounds are not accurate, the moisture sensor will not cycle the paddle wheel on/off at the correct rate, so the moisture reading also will not be accurate. If there are not any pounds being read at all, the moisture sensor will not attempt to take a reading.
Wiring Checks:
Disassemble and clean the grounds, especially the main ground in the engine compartment. Verify there is no paint or corrosion, and properly tighten. Check resistance between chassis and the battery post. Check resistance between the ground wire and the chassis at the component in question. A bad ground can cause strange things to happen.
With just the key on, check for 1.9V (+/- .2V) on wire #972 at the 8 pin connector behind the moisture sensor (must be checked with the Mass Flow Sensor plugged in). Verify there is a good ground on wire #970 at the Mass Flow Sensor (less than 1 Ohm to the battery). Also check for 5V on #971 at the Mass Flow Sensor. The Moisture Sensor provides the ground & 5V on #970 & 971, and the Mass Flow Sensor provides the 1.9V signal on #972. Decide where you do and do not have correct voltage or resistance, and you will lead yourself to the problem. Usually the problem is at a connector or the harness itself, but a failed component could possibly be the cause.
NOTE: 1.9V on wire #972 equates to about 23,000(+/- 1000) for both raw flow and zero flow under Info / Yield Monitor|Mapping / Diagnostics / page2. If this checks out good with just the key on but there is still a problem with yield or moisture, check raw flow and zero flow while harvesting. Reference the raw and zero flow readings above. If all components are installed and functional, wiring is more than likely the problem so investigate and address accordingly.
New installations may be diagnosed by loosening the two bolts connecting the Mass Flow sensor and monitoring the voltage at the same time. If the voltage was low and starts to increase, you have interference between the combine and the back of the impact plate.
Edited by SJ72 10/26/2025 17:23
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John Deere 2600 not showing yield
