DTC P179E-00: Gear Shift Actuator "A" Performance [08/2023 - ]: Procedure

1. Check for removal and installation history of the shift control actuator assembly (shift actuator ECU).

   HINT: 

   If the shift control actuator assembly (shift actuator ECU) has been replaced or removed, make sure to perform actuator position learning. Check for removal and installation history as this DTC may be stored if the learning has not been completed.

   Result

   Result	Proceed to
   History exists	A
   No history	B

Result: 

B 

See step  5

Result: 

A 

See step  2

Pre-procedure1

1. Turn the ignition switch to ON.

   Procedure1

2. Clear the DTCs.

   Powertrain > Hybrid Control > Clear DTCs 

   Result

   Proceed to
   NEXT

   Post-procedure1

3. Turn the ignition switch off.
4. Disconnect the GTS.
5. Leave the vehicle as is for 60 seconds or more.
   NOTE:

   • Do not connect the GTS.
   • Do not depress the brake pedal.
   • Do not open/close any of the doors.

Result: 

NEXT 

See step  3

Pre-procedure1

1. Turn the ignition switch to ON.

   Procedure1

2. Perform ACT Position Learning.

   HINT: 

   Refer to UTILITY [10/2022 - ]

   Powertrain > Hybrid Control > Utility 

   Tester Display
   ACT Position Learning

   Result

   Proceed to
   NEXT

   Post-procedure1

3. Turn the ignition switch off.

Result: 

NEXT 

See step  4

Pre-procedure1

1. Turn the ignition switch to ON.
2. With the brake pedal depressed, perform a shift operation then change the shift state to N.
3. Press the P position switch to change the shift state to P.

   Procedure1

4. Check for DTCs.

   Powertrain > Hybrid Control > Trouble Codes 

   Result

   Result	Proceed to
   P179E-00 is not output	A
   P179E-00 is output	B

   Post-procedure1

5. Turn the ignition switch off.

Result: 

A 

END 

Result: 

B 

See step  5

Pre-procedure1

1. Turn the ignition switch to ON.

   Procedure1

2. Check if DTCs are output.

   Powertrain > Hybrid Control > Trouble Codes 

   Result

   Result	Proceed to
   No DTCs in the table below are output	A
   P179E-00 and any DTCs in the table below are output	B

   Priority	Relevant DTC
   1	P1753-87	Lost Communication with Gear Shift Control Module "B" (Local-CAN) Missing Message
   	P1789-87	Lost Communication with Gear Shift Control Module "A" from "B" Missing Message
   	P1790-14	Gear Shift Actuator "A" Supply Voltage "A" Circuit Short to Ground or Open
   	P18B2-00	Gear Shift Control Module "B" Motor Angle Sensor "A" Performance
   	P18B5-62	Gear Shift Actuator "A" Phase U-V-W Current Sensor Signal Compare Failure
   	U1170-00	Lost Communication with Brake System Control Module (Gear Shift Control Module "A")
   2	P179C-49	Gear Shift Actuator "A" Control Circuit Internal Electronic Failure

   HINT: 

   The chart above is listed in inspection order of priority.

   Post-procedure1

3. Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART (ELECTRONIC SHIFT LEVER SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - ] 

Result: 

A 

See step  6

1. Check the connection of the auxiliary battery terminal.

   OK

   The auxiliary battery is connected securely and there are no contact problems.

   HINT: 

   Perform an inspection with consideration of a power supply voltage interruption due to a loose terminal, poor connection, etc.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  7

Pre-procedure1

1. Disconnect the B56 and B57 shift control actuator assembly (shift actuator ECU) connectors.

   Procedure1

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   B57-8 (BAT1) - Body ground	Always	11 to 14 V
   B56-1 (MA1) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. Connect the shift control actuator assembly (shift actuator ECU) connectors.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - SHIFT ACTUATOR ECU) 

Result: 

OK 

See step  8

Pre-procedure1

1. Disconnect the B56 shift control actuator assembly (shift actuator ECU) connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B56-2 (E01) - Body ground	Always	Below 1 Ω
   B56-7 (E02) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. Connect the shift control actuator assembly (shift actuator ECU) connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SHIFT ACTUATOR ECU - BODY GROUND) 

Result: 

OK 

See step  9

1. Check that the parking lock motor locks and unlocks smoothly.

   HINT: 

   Refer to ON-VEHICLE INSPECTION [10/2022 - ]

   OK

   The parking lock smoothly engages and disengages.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SHIFT CONTROL ACTUATOR ASSEMBLY (SHIFT ACTUATOR ECU). Refer to  REMOVAL [08/2023 - ] 

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [08/2023 - 10/2024]  , or refer to  REMOVAL [10/2024 - ]