DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message [08/2023 - ]: Procedure

Pre-procedure1

• None.

• Check for DTCs.

  Powertrain > Hybrid Control > Trouble Codes 

  Result

  Result	Proceed to
  DTCs are not output	A
  DTCs 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 [08/2023 - 10/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2024 - ] 

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
  C59-8 (+B1) - Body ground	Ignition switch ON	11 to 14 V	V
  A21-10 (+B2) - 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 (HYBRID VEHICLE CONTROL ECU 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.
  NOTE:

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

  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) - o5-8 (CA1L)	Ignition switch off	108 to 132 Ω	Ω

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  NOTE:

  Make sure that each connector between the electric vehicle charger 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.

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.

• Disconnect the H124 Electric vehicle charger assembly connector.
  NOTE:

  Before disconnecting the connector, check that it 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.
• Connect the SST.

  HINT: 

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

• 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
  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
  o5-7 (CA1H) or C59-9 (CA4H) - Other terminals and body ground	Ignition switch off	10 kΩ or higher	kΩ
  o5-8 (CA1L) or 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 transmission floor shift assembly (shift control ECU) connector.
• Reconnect the shift control actuator assembly (shift actuator ECU) connector.
• Reconnect the Electric vehicle charger assembly 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