Service Call 501-582
D255/D256/M281/M282 6-32 SM
SC No. Type Error Name/Error Condition/Major Cause/Solution
SC520-01 D Main Motor Error 1
The main motor is not stabilized within 2 seconds after the motor
is activated.
 Main motor defective
 IOB defective
 Main motor defective
1. Reconnect the following connector. Then perform a
conduction inspection. If there is no conduction, replace
the connector.
 IOB – Main Motor connector
2. Replace the main motor.
 IOB defective
1. Update the engine software to the latest version.
2. Replace the IOB.
SC No. Type Error Name/Error Condition/Major Cause/Solution
SC520-02 D Main Motor Error 2
After the main motor is stabilized, the stable OFF signal is
detected for 2 seconds consecutively.
 Main motor defective
 IOB defective
 Main motor defective
1. Check if the gears rotate smoothly. If any gears are
damaged, replace them.
2. Reconnect the following connector. Then perform a
conduction inspection. If there is no conduction, replace
the connector.
 IOB – Main Motor connector
3. Replace the main motor.
 IOB defective
1. Update the engine software to the latest version.
2. Replace the IOB.
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