Yale MPB045VG Maintenance Manual page 65

ELECTRICAL SYSTEM
CAUSE A - CANBUS COMMUNICATION FAULT
PROCEDURE OR ACTION:
NOTE: Perform Step 1 and Step 2 with key in ON position.
NOTE: Connector CJ2 is an eight position connector.
1. Disconnect the tiller card connector CJ2 and measure voltage between connector CJ2, socket 2 and B(-).
Is CAN HI voltage approximately 2.5 Vdc?
YES: Proceed to Step 2.
NO: Inspect CAN HI circuit for open or short. If voltage is 0 volts, the CAN HI circuit is shorted to ground or
open. If voltage is above 5 volts, the CAN HI circuit is shorted to power.
2. Measure voltage between the tiller card connector CJ2, socket 1 and B(-).
Is CAN LO voltage approximately 2.5 Vdc?
YES: Disconnect battery and proceed to Step 3.
NO: Inspect CAN LO circuit for open or short. If voltage is 0 volts, the CAN LO circuit is shorted to ground or
open. If voltage is above 5 volts, the CAN LO circuit is shorted to power.
3. Measure resistance between the tiller card connector CJ2, socket 1 and socket 2.
Is resistance 60 ± 6 ohms?
YES: No communication faults are present, connect battery and proceed to CAUSE B.
NO: If resistance is 120 ohms, the CANbus has an open circuit or a missing or damaged termination resistor.
If resistance is 0 ohms, the CANbus circuits are shorted together.
CAUSE B - TILLER CARD WIRING FAULT
PROCEDURE OR ACTION:
NOTE: Perform Steps 1 through 4 with key in ON position.
1. Open control handle, observe tiller card assembly.
Is CRS03 connected to Tiller Card JP1?
YES: Proceed to Step 2.
NO: Connect tiller harness to JP1.
2. With control handle open, observe tiller card LCD display and re-key truck.
Does LCD display illuminate?
YES: Proceed to Step 3.
NO: Proceed to Step 4.
3. Continue to observe tiller card LCD display and re-key truck.
Is LCD display properly configured?
YES: Proceed to CAUSE C.
NO: Refer to 2200YRM 1507 to configure tiller card.
4. Disconnect CRS03 from tiller card JP1. Measure voltage between socket 1 and B(-).
Is voltage same as battery voltage?
YES: Disconnect battery and proceed to Step 5.
NO: Inspect circuit 010 between key switch TS05 and CRS03 for open or short.
5. Measure resistance between the tiller card connector JP1, socket 2 and B(-).
Is resistance ≤1 ohm?
YES: Proceed to CAUSE C.
NO: Inspect ground circuit 101 for open, short, or source of excessive resistance.
Check the Service Manual section in Yale Axcess Online for possible updates and check pertinent Bulletins
Confidential/Proprietary - Do Not Copy or Duplicate
Diagnostic Trouble Codes
9030-20-41