Kohler 5ECD Service Manual page 34

Verify resistance of 60 ohms at P19 (SmartCraftt) wire 219 and 206, pins C and D.
If the meter reads 0 ohms, there's an open circuit to the R2 resistor.
If the meter reads 120 ohms, the two resistors in the harness are no longer in parallel. Check the connections between the
resistors.
Verify resistance of 60 ohms at the P10 (ECM) connector, wires BLK and RED, pins 6 and 19.
If the meter reads 0 ohms, there's an open circuit between these pins, wires and/or the harness resistors.
If the meter reads 120 ohms, the two resistors in the harness are no longer in parallel. Check the connections between the
resistors.
Figure 4-8 Troubleshooting EC72 Fault Code (Verifying Control Area Network (CAN) Resistance)
34 Section 4 Controller TP-6391 9/08