DTC P18A6-00: Gear Shift Control Module "A"/"B" (Sub CPU) Ignition Switch On/Start Position Signal Compare Failure; DTC P18A6-62: Gear Shift Control Module "A"/"B" Ignition Switch On/Start Position Signal Compare Failure [08/2023 - ]: Procedure

Pre-procedure1

• Disconnect the B56 shift control actuator assembly (shift actuator ECU) connector.
• Connect the battery terminal.
• 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
  B56-5 (IGR1) - Body ground	Ignition switch ON	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

  NOTE:

  Turning the ignition switch to ON with the connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Post-procedure1

• Turn the ignition switch off.
• Disconnect the battery terminal.
• Connect the shift control actuator assembly (shift actuator ECU) connector.

Result: 

OK 

REPLACE SHIFT CONTROL ACTUATOR ASSEMBLY (SHIFT ACTUATOR ECU). Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

See step  2

Pre-procedure1

• Disconnect the B56 shift control actuator assembly (shift actuator ECU) connector.
• Disconnect the A72 power distribution box assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A72-13 - B56-5 (IGR1)	Always	Below 1 Ω	Ω
  A72-13 or B56-5 (IGR1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Connect the power distribution box assembly connector.
• Connect the shift control actuator assembly (shift actuator ECU) connector.

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY POWER SOURCE CIRCUIT) 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SHIFT ACTUATOR ECU - POWER DISTRIBUTION BOX ASSEMBLY)