DTC P178A-14: Gear Shift Control Module "B" Wake-up Circuit Short to Ground or Open; DTC P178D-14: Gear Shift Control Module "B" (Sub CPU) Wake-up Circuit Short to Ground or Open [11/2021 - ]: Procedure

Pre-procedure1

1. Disconnect the B79 shift control actuator assembly (shift actuator ECU) connector.
2. Turn the ignition switch to ON.
   NOTE:

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

   Procedure1

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   B79-5 (WAKE) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. Turn the ignition switch off.
5. Connect the shift control actuator assembly (shift actuator ECU) connector.

Result: 

OK 

REPLACE SHIFT CONTROL ACTUATOR ASSEMBLY (SHIFT ACTUATOR ECU). Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

See step  2

Pre-procedure1

1. Disconnect the B79 shift control actuator assembly (shift actuator ECU) connector.
2. Disconnect the D39 transmission floor shift assembly (shift control ECU) connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B79-5 (WAKE) - D39-5 (WAKE)	Always	Below 1 Ω
   B79-5 (WAKE) or D39-5 (WAKE) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. Connect the transmission floor shift assembly (shift control ECU) connector.
5. Connect the shift control actuator assembly (shift actuator ECU) connector.

Result: 

OK 

REPLACE TRANSMISSION FLOOR SHIFT ASSEMBLY (SHIFT CONTROL ECU). Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR