Pinpoint Test AO: DTC P0B37:00
High-Voltage Traction Battery
Pinpoint Test AO: DTC P0B37:00
Refer to Wiring Diagram Set 12 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Charging System for schematic and connector information. Diagrams By Number
Normal Operation
The service disconnect plug completes the high-voltage circuit. It is fused to protect the high-voltage components in the event current raises above the normal operating range. The service disconnect plug also shuts off the high-voltage to the system so service to the system can be completed safely. When the service disconnect plug is open, the stop safely hazard (red triangle) warning indicator is illuminated and the vehicle will shut down and/or not start.
- P0B37:00 (High Voltage Service Disconnect Open: No Sup Type Information) - This DTC is set when the service disconnect is open for 1 second or more while the service disconnect plug is still inserted in the High Voltage Traction Battery (HVTB).
This pinpoint test is intended to diagnose the following:
- Service disconnect plug
- HVTB
- Battery Pack Sensor Module (BPSM)
PINPOINT TEST AO: DTC P0B37:00
WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage hybrid system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.
WARNING: Always inspect gloves before each use to prevent high-voltage shock. High-voltage insulated safety gloves with a leather outer glove are required to service some components of this vehicle where specified in the service procedures. All high-voltage insulated safety gloves must meet or exceed ANSI/ASTM class 00. Refer to Rubber Insulating Gloves Testing Rubber Insulating Gloves Testing. Failure to follow these instructions may result in serious personal injury or death.
-------------------------------------------------
AO1 CHECK SERVICE DISCONNECT PLUG POSITION
- Ignition OFF.
- Make sure service disconnect plug is inserted correctly and securely.
- Is the service disconnect plug seated correctly?
Yes
GO to AO2.
No
REPOSITION service disconnect plug correctly. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
AO2 CHECK SERVICE DISCONNECT PLUG
WARNING: Never install the service disconnect plug with the high-voltage bussed electrical center (BEC) cover removed. Always install the cover prior to connecting the service disconnect plug. The high-voltage BEC cover prevents inadvertent contact with the high voltage which is present at several points under the cover. Failure to follow these instructions may result in serious personal injury or death.
- Depower the HVTB system. Refer to High-Voltage Traction Battery Systems Depowering High-Voltage Traction Battery Systems Depowering.
- Measure the resistance between the 2 service disconnect plug terminals, component side.
- Is the resistance less than 5 ohms?
Yes
GO to AO3.
No
INSTALL a new service disconnect plug. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
AO3 CHECK THE BPSM
WARNING: Always wear high-voltage insulated safety gloves with leather outer gloves and a face shield when servicing the battery pack sensor module (BPSM) and never remove the high-voltage BPSM connector unless directed by a service procedure. High voltage is present at the BPSM at all times, even with service disconnect plug removal. Depowering the system will not remove voltage from the BPSM connector with the orange harness. Follow all service instructions. Failure to follow these instructions may result in serious personal injury or death.
WARNING: Never install the service disconnect plug with the high-voltage bussed electrical center (BEC) cover removed. Always install the cover prior to connecting the service disconnect plug. The high-voltage BEC cover prevents inadvertent contact with the high voltage which is present at several points under the cover. Failure to follow these instructions may result in serious personal injury or death.
- Install a new BPSM. Refer to Battery Pack Sensor Module (BPSM) Service and Repair.
- Connect: Service Disconnect Plug.
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Clear DTCs - BECM.
- Enter the following diagnostic mode on the scan tool: Self Test - BECM.
- Is DTC P0B37:00 retrieved?
Yes
INSTALL a new HVTB (includes HVTB system wire harness). REFER to High-Voltage Traction Battery High-Voltage Traction Battery. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
Repair is complete. TEST the system for normal operation.
-------------------------------------------------