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ELECTRICAL SYSTEM
POSSIBLE CAUSE
A. WIRING FAULT
B. BRAKE COIL FAULT
C. FAULTY TRACTION CONTROLLER
COMPONENT OPERATIONAL CHECK
PROCEDURE OR ACTION:
1. Conduct a visual inspection of all connectors/wiring associated with the fault code.
Are any faults detected/observed?
YES: Repair/replace connector or wiring associated with faults found. Refer to the appropriate Electrical
SystemYRM .
NO: Proceed to Step 2.
2. Re-key the vehicle.
Is the code still present?
YES: Proceed to CAUSE A.
NO: Fault may be intermittent.
CAUSE A - WIRING FAULT
PROCEDURE OR ACTION:
NOTE: Perform Step 1 with key in ON position.
1. Disconnect CPS01 and measure voltage between CPS01, socket 1 and B(-). Note voltage reading, reconnect
CPS01, cycle key switch. Disconnect brake coil connector CRP04-A and measure voltage between CRP04-A,
socket 1 and B(-).
Is voltage same as key switch input?
YES: Disconnect battery and proceed to CAUSE B.
NO: Inspect circuit 239 for open or short.
CAUSE B - BRAKE COIL FAULT
PROCEDURE OR ACTION:
1. Measure resistance between CPS01, socket 5 and CRP04-A, socket 1.
Is resistance 23 ± 2.3 ohms?
YES: Proceed to CAUSE C.
NO: Replace faulty brake coil.
CAUSE C - FAULTY TRACTION CONTROLLER
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 an accurate problem description leading to controller replacement.
Check the Service Manual section in Yale Axcess Online for possible updates and check pertinent Bulletins
Confidential/Proprietary - Do Not Copy or Duplicate
Please refer to the end of this procedure for supporting diagrams.
DTC 30035
Brake
NOTE
Diagnostic Trouble Codes
9030-20-9
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Table of Contents
Troubleshooting
Need help?
Do you have a question about the MPB045VG and is the answer not in the manual?
Questions and answers
Will not turn on or charge.
The Yale MPB045VG may not turn on or charge due to several possible reasons:
1. Battery Issues: Ensure the battery is rated at 24V and is properly connected to the truck. If the battery voltage is too high or too low, the truck may not operate.
2. Controller Wiring Fault: Measure the voltage between the traction controller B(+) terminal and B(-). If the precharge voltage is not the same as the battery voltage, inspect the B(+) cable for damage or loose connections.
3. Faulty Controller: If no wiring faults are found and the issue persists, the controller may be faulty and require replacement.
4. CANbus Communication Issues: If CANbus communication is interrupted, check for open circuits, missing or damaged termination resistors, or internal control module failures.
5. Capacitor Discharge Needed: If an error code is present, try disconnecting the battery, discharging the capacitor, reconnecting the battery, and restarting the vehicle.
Following these steps can help diagnose and resolve the issue preventing the truck from turning on or charging.
This answer is automatically generated
Battery isn’t charging
The battery for the Yale MPB045VG may not be charging due to several possible reasons:
1. Battery Damage or Leakage: Check the battery case for damage or leakage. If damaged, it must be repaired.
2. Worn or Aged Cables: Inspect for aged or damaged wires or cables that may prevent charging.
3. Incorrect Charger or Charging Procedure: Use only chargers approved by the battery manufacturer and follow the specified charging procedures.
4. Poor Ventilation or Obstructed Vent Caps: Ensure proper ventilation during charging and keep vent caps clear.
5. Low Electrolyte Level: Make sure the battery plates are covered with electrolyte before charging.
6. Overheated Electrolyte: Do not charge if the electrolyte temperature exceeds 49°C (120°F).
7. Battery Left Discharged: Avoid leaving the battery completely discharged, as it can prevent proper charging.
8. Welded Contactor Tips: If the truck was operated with a low battery, check for welded contactor tips.
Any of these issues can prevent the battery from charging properly.
This answer is automatically generated
Lights are flashing but not charging
The lights may be flashing on the Yale MPB045VG and not charging due to a detection error or abnormal shutdown. According to the LED status indicators:
- If the red DET (Detection Error) LED is illuminated continuously, the battery is either not connected to the charger or the battery voltage is less than 2V.
- If the red SDN (Abnormal Shutdown) LED is flashing, an abnormal shutdown has occurred.
These conditions prevent the charger from starting the charging cycle.
This answer is automatically generated