Battery System, Hybrid Drive
High-Voltage Traction Battery
Pinpoint Test AF: DTCs U3001:00, U3003:16 and U3003:17
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 12-volt battery supplies voltage to the Battery Energy Control Module (BECM) in order for the BECM (Battery Energy Control Module) to operate. If this voltage is low or not available, the BECM (Battery Energy Control Module) cannot function correctly.
- U3001:00 (Control Module Improper Shutdown: No Sub Type Information)- Fault sets if the BECM (Battery Energy Control Module) loses its 12-volt power source unexpectedly and shuts down improperly. Reports as a continuous memory (historical) DTC only.
- U3003:16 (Battery Voltage: Circuit Voltage Below Threshold)- Fault sets if the BECM (Battery Energy Control Module) 12-volt power source falls below 8 volts for at least 5 seconds.
- U3003:17 (Battery Voltage: Circuit Voltage Above Threshold)- Fault sets if the BECM (Battery Energy Control Module) 12-volt power source goes above 16 volts for at least 5 seconds.
This pinpoint test is intended to diagnose the following:
- 12-volt battery
- Circuitry
- DC to DC Converter Control Module (DC/DC)
- BECM (Battery Energy Control Module)
PINPOINT TEST AF : DTCs U3001:00, U3003:16 AND U3003:17
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.
AF1 RETRIEVE ALL CMDTCs (Continuous Memory Diagnostic Trouble Codes)
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).
Is DTC B1316, B1318, B1676, P0562, P0563, U3001:00, U3003:16 or U3003:17 present in more than 1 module?
Yes
REFER to Hybrid Drive Systems to diagnose the DC/DC (DC to DC Converter Control Module).
No
GO to AF2.
AF2 CHECK 12-VOLT BATTERY
- Carry out the 12-volt battery condition test.
Did the 12-volt battery pass the condition test?
Yes
GO to AF3.
No
INSTALL a new battery. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
AF3 MEASURE DC/DC (DC to DC Converter Control Module) OUTPUT VOLTAGE
- Start the engine.
- For DTC U3003:17, turn off all accessories for a minimum of 2 minutes.
- For DTCs U3001:00 and U3001:16, turn on the headlamps and HVAC (Heating Ventilation Air Conditioning) fan for a minimum of 2 minutes.
- Measure 12-volt battery voltage.
Is the voltage 13-15.2 volts?
Yes
GO to AF4.
No
CARRY OUT self-test of the DC/DC (DC to DC Converter Control Module) and REFER to Hybrid Drive Systems to diagnose the DC/DC (DC to DC Converter Control Module).
AF4 COMPARE BATTERY VOLTAGE BECM (Battery Energy Control Module) PID MAIN ECU VOLTAGE SUPPLY (MAINBECMV)
- Enter the following diagnostic mode on the scan tool: DataLogger- BECM (Battery Energy Control Module).
- Monitor the BECM (Battery Energy Control Module) PID MAINBECMV.
Does the PID read 8-16 volts?
Yes
GO to AF7.
No
If the PID reads less than 8 volts, GO to AF5.
If the PID reads at least 16 volts, 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.
AF5 MEASURE BECM (Battery Energy Control Module) INPUT VOLTAGE
- Ignition OFF.
- Disconnect: BECM (Battery Energy Control Module) C4237A.
- Measure 12-volt battery voltage.
- Measure the voltage between BECM (Battery Energy Control Module) C4237A-47, SBB17 (RD), harness side and ground and BECM (Battery Energy Control Module) C4237A-48, SBB17 (RD), harness side and ground.
Are the BECM (Battery Energy Control Module) circuit voltages equal to 12-volt battery voltage?
Yes
GO to AF6.
No
VERIFY Battery Junction Box (BJB) fuse 47 (15A) is OK. If the fuse is OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. [1][2]Diagrams By Number
AF6 CHECK BECM (Battery Energy Control Module) GROUND
- Measure the resistance between BECM (Battery Energy Control Module) C4237A-49, GD126 (BK/WH), harness side and ground; and BECM (Battery Energy Control Module) C4237A-50, GD126 (BK/WH), harness side and ground.
Are the resistances less than 5 ohms?
Yes
GO to AF7.
No
REPAIR high resistance or open in the affected circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
AF7 CHECK FOR CORRECT BECM (Battery Energy Control Module) OPERATION
- Ignition OFF.
- Check the BECM (Battery Energy Control Module) harness and component side connectors for:
- corrosion.
- pushed-out/bent pins.
- Connect the BECM (Battery Energy Control Module) and make sure the connectors seat correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
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
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.