5. Remove all wire connections from the blade motor controller.
6. Measure the blade motor controller resistance (Ω):
(1) Set the multimeter to the continuity mode.
(2) Place the positive (+) probe of the digital multimeter on the positive (+) terminal of the blade
motor controller, and place the negative (-) probe of the digital multimeter on the negative (-)
terminal of the blade motor controller.
(3) If the multimeter beeps, the controller is damaged and needs to be replaced.
7. If no issues are found, reinstall the wire connections from the blade motor controller to the motor.
8. Measure blade motor resistance (Ω):
(1) Set the multimeter to the resistance mode.
(2) Place the positive (+) probe of the digital multimeter on the motor terminal U, place the
negative (-) probe of the digital multimeter on the motor terminal V, and check the reading.
(3) Place the positive (+) probe of the digital multimeter on the motor terminal U, place the
negative (-) probe of the digital multimeter on the motor terminal W, and check the reading.
(4) Place the positive (+) probe of the digital multimeter on the motor terminal V, place the
negative (-) probe of the digital multimeter on the motor terminal W, and check the reading.
(5) If the above three readings are greater than 5 Ω, replace the blade motor. Repeat this process
as required to other blade motors.
9. Measure the resistance in the six-pin motor connector by placing the negative (-) probe of
the digital multimeter on pin 2 and the positive (+) probe of the digital multimeter on pin 3.
Resistance should read between 800k and 1.2m ohms (Ω). Resistance between pin 2 and pins
1, 4, 5 and 6 should be 0 ohms. If resistances are above or below these ranges, replace the
blade motor. Repeat the process as required for other motors.
10. If steps 1-9 are completed and the issues persist, refer to the following troubleshooting processes
for wiring harnesses.
11.4 Mower Wiring Harnesses
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