Checks / troubleshooting:
1. Check the connection of PG origin sensor,
PG motor connector and CR FFC.
2. Is the PF motor losed steps?
3. Is the screw of coupling installed on PG
motor loose?
4. Is the coupling skewed?
5. Is the screw on Worm drive loose?
6. Is the direction of worm wheel appropriate?
7. PG origin sensor may be malfunction.
8. CR board may be malfunction.
9. CR_FFC may be malfunction.
10. PG motor may be malfunction.
11. MAIN board may be malfunction.

Recommended actions:
Make sure to connect it surely.