DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message [12/2022 - ]: Procedure

Pre-procedure1

• None

• Check and record any Hybrid Control DTCs and freeze frame data. Check for DTCs.

  Powertrain > Hybrid Control > Trouble Codes 

  Result

  Result	Proceed to
  DTCs related to Hybrid Control System are not output.	A
  DTCs related to Hybrid Control System are output.	B

Post-procedure1

• Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2022 - ] 

Result: 

A 

See step  2

Pre-procedure1

• 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

  Component with harness connected (Hybrid Vehicle Control ECU)

  -

  -

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  K11-8 (+B1) - Body ground	Ignition switch ON	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.

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 repair information because this may cause a malfunction.

• Disconnect the battery ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  R40-22 (CA1H) - R40-21 (CA1L)	Ignition switch off	108 to 132 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the battery ECU assembly connector.

Result: 

OK 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [12/2022 - ] 

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 repair 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.

• Disconnect the A89 inverter with converter assembly connector.
• Disconnect the K53 transmission floor shift assembly (shift control ECU) connector.
• Disconnect the C49 shift control actuator assembly (shift actuator ECU) connector.
• Disconnect the battery ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

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

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  R40-22 (CA1H) - K11-9 (CA4H)	Ignition switch off	Below 1 Ω	Ω
  R40-21 (CA1L) - K11-22 (CA4L)	Ignition switch off	Below 1 Ω	Ω
  R40-22 (CA1H) or K11-9 (CA4H) - Other terminals and body ground	Ignition switch off	10 kΩ or higher	kΩ
  R40-21 (CA1L) or K11-22 (CA4L) - Other terminals and body ground	Ignition switch off	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the battery ECU assembly connector.
• Reconnect the shift control actuator assembly (shift actuator ECU) connector.
• Reconnect the transmission floor shift assembly (shift control ECU) connector.
• Reconnect the inverter with converter assembly connector.
• Reconnect the hybrid vehicle control ECU connector.

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [12/2022 - 03/2023]  , or refer to  REMOVAL [03/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR