U0074
High-Voltage Traction Battery
Pinpoint Test AE: DTC U0074:00 or U1006:00
Refer to Wiring Diagram Set 12, Charging System for schematic and connector information. [1][2]Diagrams By Number
Normal Operation
During normal vehicle operation the Battery Energy Control Module (BECM) and Battery Pack Sensor Module (BPSM) communicate with each other providing information each module needs to properly monitor and control the high-voltage system This communication is done over a dedicated Controller Area Network (CAN).
- U0074:00 (Control Module Communication Bus "B" Off: No Sub Type Information)- Fault sets if the BECM (Battery Energy Control Module) detects the dedicated CAN (Controller Area Network) is off.
- U1006:00 (Sub Network CAN Initialization Failure: No Sub Type Information)- Fault sets if the BECM (Battery Energy Control Module) detects the dedicated CAN (Controller Area Network) hardware does not initialize for 1 second or more.
This pinpoint test is intended to diagnose the following:
- BECM (Battery Energy Control Module)
- BPSM (Battery Pack Sensor Module)
- High Voltage Traction Battery (HVTB)
PINPOINT TEST AE : DTC U0074:00 OR U1006:00
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 . Failure to follow these instructions may result in serious personal injury or death.
NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
AE1 CHECK CAN (Controller Area Network) CIRCUITS
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.
- Ignition OFF.
- Depower the HVTB (High Voltage Traction Battery) system. Refer to High-Voltage Traction Battery Systems Depowering .
- Remove the high-voltage Bussed Electrical Center (BEC) cover. Refer to the exploded view in Battery Pack Sensor Module (BPSM) .
- Disconnect: BPSM (Battery Pack Sensor Module) C4238B.
- Disconnect: BECM (Battery Energy Control Module) C4237B.
- Measure the resistance between BECM (Battery Energy Control Module) C4237B-2, circuit J1-A02, harness side and BPSM (Battery Pack Sensor Module) C4238B-23, circuit J1-A02, harness side; and between BECM (Battery Energy Control Module) C4237B-18, circuit J1-A18, harness side and BPSM (Battery Pack Sensor Module) C4238B-22, circuit J1-A18, harness side.
Are the resistances less than 5 ohms?
Yes
GO to AE2.
No
INSTALL a new HVTB (High Voltage Traction Battery) (includes HVTB (High Voltage Traction Battery) system wire harness). REFER to High-Voltage Traction Battery . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
AE2 CHECK CIRCUITS FOR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between BECM (Battery Energy Control Module) C4237B-2, circuit J1-A02, harness side and ground; and between BECM (Battery Energy Control Module) C4237B-18, circuit J1-A18, harness side and ground.
Are the resistances greater than 10,000 ohms?
Yes
GO to AE3.
No
INSTALL a new HVTB (High Voltage Traction Battery) (includes HVTB (High Voltage Traction Battery) system wire harness). REFER to High-Voltage Traction Battery . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
AE3 MEASURE BPSM (Battery Pack Sensor Module) TERMINATION RESISTANCE
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.
- Ignition OFF.
- Measure the resistance between BPSM (Battery Pack Sensor Module) C4238B pin 22 and pin 23, component side.
Is the resistance between 108 and 132 ohms?
Yes
GO to AE4.
No
INSTALL a new BPSM (Battery Pack Sensor Module). REFER to Battery Pack Sensor Module (BPSM) . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
AE4 MEASURE BECM (Battery Energy Control Module) TERMINATION RESISTANCE
- Measure the resistance between BECM (Battery Energy Control Module) C4237B pin 2 and pin 18, component side.
Is the resistance between 108 and 132 ohms?
Yes
GO to AE5.
No
INSTALL a new BECM (Battery Energy Control Module). REFER to Battery Energy Control Module (BECM) . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
AE5 RETEST AND ISOLATE MODULES
- Connect: BECM (Battery Energy Control Module) C4237B (leave BPSM (Battery Pack Sensor Module) C4238B disconnected).
- Enter the following diagnostic mode on the scan tool: Clear DTCs- BECM (Battery Energy Control Module).
- Enter the following diagnostic mode on the scan tool: Self Test- BECM (Battery Energy Control Module).
Is DTC U0074:00 or U1006:00 retrieved?
Yes
INSTALL a new BECM (Battery Energy Control Module). REFER to Battery Energy Control Module (BECM) . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
INSTALL a new BPSM (Battery Pack Sensor Module). REFER to Battery Pack Sensor Module (BPSM) . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.