A5: Check Harness Continuity

Disconnect PI034 and, measure the resistance, in turn between:
EM012/001 and PI034/004
EM012/002 and PI034/001
EM012/003 and PI034/006
EM012/004 and PI034/003

- Is the resistance < 0.5 ohms?
Yes
GO to A6 A6: Check Stepper Motor Insulation
No
Inspect EM012 and PI034 for bent/pushed back pins or locate and repair the appropriate harness/connector PI001/008, PI001/009, PI001/010 or PI001/007.