TM 1-2840-252-23-3
G-25
FAULT CODE FB, REVERSIONARY STEP COUNT EXPANDED INSTRUCTIONS
Step 2.
Check harness connector PL3 (figure 201) at DECU, and P5 at HMA for tight connections.
Step 3.
Disconnect connectors PL3 and P5 to check pns and sockets.
i
Step 5.
With PL3 disconnected, check resistance of HMA (reversionary stepper motor) at harness PL3 connector
sockets F and E (figure 202), G and E, H and E, and J and E. In each case, limit is 11.0 - 24.5Q.
Step 6.
With P5 disconnected, check resistance of HMA (reversionary stepper motor) at HMA J5. connector pins 2
and 6, 3 and 6, 4 and 6, and 5 and 6. In each case, limit is11.0 - 24.0Q.
Step 7.
Before tightening harness connectors PL3 and P5, be sure that keyways in harness connecto are aligned
rs
with keyways in component connectors.
Step 12.
Refer to manufacturer's procedure for diagnosing and replacing harness.
Step 17
Refer to manufacturer's procedure for diagnosing and replacing harness.
RESISTANCE-CHECK SUMMARY
Resistance (Ω)
Connector
Component
No.
Contacts
Limits
Nominal*
HMA - Primary Stepper Motor
PL3
F&E
11.0 - 24.5
17.0
G&E
11.0 - 24.5
17.0
H&E
11.0 - 24.5
17.0
J&E
11.0 - 24.5
17.0
J5
2&6
11.0 - 24.0
17.0
3&6
11.0 - 24.0
17.0
4&6
11.0 - 24.0
17.0
*At 25
5&6
11.0 - 24.0
17.0
C
G-46