DTC U0291-87: Lost Communication with Gear Shift Control Module "B" Missing Message [09/2023 - ]: Procedure

Pre-procedure1

• According to the display on the GTS, select "Health Check".

• Check for DTCs.

  Result

  Result	Proceed to
  No DTCs are output.	A
  DTCs are output.	B

Post-procedure1

• Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

Result: 

A 

See step  2

Pre-procedure1

• None.

• Check for DTCs.

  Powertrain > Hybrid Control > Trouble Codes 

  Result

  Result	Proceed to
  Only U0291-87 is output	A
  U0291-87 and U1176-87 are output	B

Post-procedure1

• Turn the ignition switch off.

Result: 

B 

SHIFT CONTROL ACTUATOR ASSEMBLY (SHIFT CONTROL ACTUATOR ECU) POWER SOURCE CIRCUIT FAILURE. Refer to  ECU Power Source Circuit [09/2023 - ] 

Result: 

A 

See step  3

Pre-procedure1

• Disconnect the shift control actuator assembly (shift control actuator ECU) connectors.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C64-8 (BAT1) - Body ground	Ignition switch off	11 to 14 V	V

  HINT: 

  As there might be an intermittent malfunction, inspect the following items even if the measured voltage is as specified.

  • Installation condition of fuse(s) (before removing fuse(s)) (BAT1 circuit)
  • Fuse condition (before and after removing fuse(s)) (BAT1 circuit)
  • Connection condition of connectors (BAT1 circuit)
  • Wire harness condition (BAT1 circuit)
  • Wire harness condition (GND circuit)

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the shift control actuator assembly (shift control actuator ECU) connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SHIFT CONTROL ACTUATOR ASSEMBLY (SHIFT CONTROL ACTUATOR ECU) POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  4

Pre-procedure1

• Disconnect the shift control actuator assembly (shift control actuator ECU) connector.
• Turn the ignition switch to ON.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C53-5 (IGC1) - Body ground	Ignition switch ON	11 to 14 V	V

  HINT: 

  As there might be an intermittent malfunction, inspect the following items even if the measured voltage is as specified.

  • Installation condition of fuse(s) (before removing fuse(s)) (IGC1 circuit)
  • Fuse condition (before and after removing fuse(s)) (IGC1 circuit)
  • Connection condition of connectors (IGC1 circuit)
  • Wire harness condition (IGC1 circuit)
  • Wire harness condition (GND circuit)

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Reconnect the shift control actuator assembly (shift control actuator ECU) connector.

Result: 

OK 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

Result: 

NG 

GO TO ECU POWER SOURCE CIRCUIT. Refer to  ECU Power Source Circuit [09/2023 - ]