Yale MPB045VG Maintenance Manual page 62

Diagnostic Trouble Codes
CAUSE A - WIRING FAULT
PROCEDURE OR ACTION:
NOTE: Key in ON position
1. Disconnect battery display connector CRS07.
Did the code clear upon rekey?
YES: Proceed to CAUSE B.
NO: Proceed to Step 2.
2. Disconnect encoder connector CPS03.
Did the code clear upon rekey?
YES: Proceed to CAUSE C.
NO: Proceed to Step 3.
3. With encoder connector and battery display connector removed, measure voltage between CRS07, socket 5
and B(-).
Is voltage 12 ± 1.5 Vdc?
YES: Proceed to Step 4.
NO: Disconnect battery and proceed to Step 5.
4. Measure voltage between CRS03, socket 4 and B(-).
Is voltage 12 ± 1.5 Vdc?
YES: Proceed to CAUSE D.
NO: Disconnect battery and proceed to Step 6.
5. Disconnect controller connector CPS01, encoder CPS03, and battery display CRS07. Measure resistance
between CRS07, socket 5 and CPS01, socket 25.
Is resistance ≤ 1 ohm?
YES: Proceed to CAUSE D.
NO: Inspect circuit 032 for open, short, or source of excessive resistance.
6. Disconnect controller connector CPS01, encoder CPS03, and battery display CRS07. Measure resistance
between CPS03, socket 1 and CPS01, socket 26.
is resistance ≤ 1 ohm?
YES: Proceed to CAUSE D.
NO: Inspect circuit 250 for open, short, or source of excessive resistance.
CAUSE B - BATTERY DISPLAY FAULT
PROCEDURE OR ACTION:
1. If faults are found when reconnecting, replace BDI. Make sure to indicate the DTC code(s) on the warranty
claim to include an accurate problem description leading to controller replacement.
CAUSE C - ENCODER FAULT
PROCEDURE OR ACTION:
1. if faults are found when reconnecting, replace encoder. make sure to indicate the DTC code(s) on the
warranty claim to include an accurate problem description leading to controller replacement.
CAUSE D - TRACTION CONTROLLER FAULT
PROCEDURE OR ACTION:
1. If no faults are found, replace controller. Make sure to indicate the DTC code(s) on the warranty claim to
include and accurate problem description leading to controller replacement.
Check the Service Manual section in Yale Axcess Online for possible updates and check pertinent Bulletins
9030-20-38 Confidential/Proprietary - Do Not Copy or Duplicate
ELECTRICAL SYSTEM