DTC U0111-87: Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message [08/2023 - ]: Procedure

Pre-procedure1

• None.

• Check and record any HV battery system DTCs and freeze frame data. Check for DTCs.

  Powertrain > HV Battery > Trouble Codes 

  Result

  Result	Proceed to
  DTCs related to HV Battery are not output.	A
  DTCs related to HV Battery are output.	B

Post-procedure1

• Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - ] 

Result: 

A 

See step  2

Pre-procedure1

• Check that the service plug grip is not installed.
  NOTE:

  After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Connect the SST.

  HINT: 

  Refer to Instructions for Connecting SST [08/2023 - ]

• Disconnect the battery ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Connect the cable to the negative (-) auxiliary battery terminal.
• Turn the ignition switch to ON.

• Measure the voltage according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Battery ECU Assembly)

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  o5-1 (AM) - Body ground	Ignition switch off	11 to 14 V	V
  o5-5 (IGCT) - Body ground	Ignition switch ON	11 to 14 V	V

  NOTE:

  Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  HINT: 

  As there might be an intermittent malfunction in the battery ECU assembly power source circuit, inspect the following even if the measured voltage is as specified:

  • Installation condition of fuse(s) (before removing fuse(s)) (Power Source Circuit)
  • Fuse condition (before and after removing fuse(s)) (Power Source Circuit)
  • Connection condition of connectors (Power Source Circuit)
  • Wire harness condition (Power Source Circuit)
  • Wire harness condition (GND circuit)
• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  o5-25(GND) - Body ground	Ignition switch off	Below 1 Ω	Ω
  o5-26(GND1) - Body ground	Ignition switch off	Below 1 Ω	Ω
  o5-27(GND2) - Body ground	Ignition switch off	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the battery ECU assembly connector.
• Disconnect the SST.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY ECU ASSEMBLY POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  3

Pre-procedure1

• Check that the service plug grip is not installed.
  NOTE:

  After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Connect the SST.

  HINT: 

  Refer to Instructions for Connecting SST [08/2023 - ]

• Disconnect the battery ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Battery ECU Assembly)

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  o5-7 (CA1H) - o5-8 (CA1L)	Ignition switch off	108 to 132 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the battery ECU assembly connector.
• Disconnect the SST.

Result: 

OK 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

Result: 

NG 

See step  4

Pre-procedure1

• Check that the service plug grip is not installed.
  NOTE:

  After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Disconnect the hybrid vehicle control ECU connector.
  NOTE:

  • Before disconnecting the connector, check that it is not loose or disconnected.
  • Check that each connector between the hybrid vehicle control ECU and battery ECU assembly is not loose or disconnected.
• Disconnect the B56 shift control actuator assembly (shift actuator ECU) connector.
• Disconnect the C35 transmission floor shift assembly (shift control ECU) connector.
• Disconnect the H124 electric vehicle charger assembly connector.
• Connect the SST.

  HINT: 

  Refer to Instructions for Connecting SST [08/2023 - ]

• Disconnect the battery ECU assembly connector.
  NOTE:

  • Before disconnecting the connector, check that it is not loose or disconnected.
  • Check the terminals of the connector for deformation and corrosion.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  o5-7 (CA1H) - C59-9 (CA4H)	Ignition switch off	Below 1 Ω	Ω
  o5-8 (CA1L) - C59-22 (CA4L)	Ignition switch off	Below 1 Ω	Ω
  C59-9 (CA4H) - Other terminals and body ground	Ignition switch off	10 kΩ or higher	kΩ
  C59-22 (CA4L) - Other terminals and body ground	Ignition switch off	10 kΩ or higher	kΩ

  NOTE:

  Make sure that each connector between the battery ECU assembly and hybrid vehicle control ECU is not loose or disconnected and its terminals are not deformed or corroded.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the battery ECU assembly connector.
• Disconnect the SST.
• Reconnect the electric vehicle charger assembly connector.
• Reconnect the transmission floor shift assembly (shift control ECU) connector.
• Reconnect the shift control actuator assembly (shift actuator ECU) connector.
• Reconnect the hybrid vehicle control ECU connector.

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR