DTC C1581: Assist Map Number Un-Writing [06/2018 - ]: Procedure

1. Perform assist map writing.

   Chassis > EMPS > Utility 

   Tester Display
   Signal Check

2. Check for DTCs.

   Chassis > EMPS > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1581 is output.	A
   DTC C1581 is not output.	B

Result: 

B 

END 

Result: 

A 

See step  2

1. Check for DTCs.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

   Result

   Result	Proceed to
   CAN communication system DTCs are not output.	A
   CAN communication system DTCs are output.	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

Result: 

A 

See step  3

1. Confirm if the related part has the correct part number.

   Related Part	Hybrid vehicle control ECU
   	Skid control ECU (Brake booster with master cylinder assembly)

   NOTE:

   When removing the related part to check it, be sure to follow the appropriate procedures and precautions.

   • Hybrid vehicle control ECU

     Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

   • Skid control ECU (Brake booster with master cylinder assembly)

     Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

   Result

   Result	Proceed to
   The related part has the correct part number.	A
   The related part has an incorrect part number.	B

Result: 

B 

See step  5

Result: 

A 

See step  4

1. Select Health Check on the Techstream screen and check if system DTCs of the related part are output.

   HINT: 

   If system DTCs of the related part are stored, assist map writing to the power steering ECU (rack and pinion power steering gear assembly) may not be performed properly.

   Result

   Result	Proceed to
   System DTCs of the related part are output.	A
   System DTCs of the related part are not output.	B

Result: 

A 

GO TO DIAGNOSTIC PROCEDURE INDICATED BY OUTPUT DTC 

Result: 

B 

REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY. Refer to  REMOVAL [06/2018 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

1. Replace the related part with one that has the correct part number.
   • Hybrid vehicle control ECU

     Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

   • Skid control ECU (Brake booster with master cylinder assembly)

     Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Chassis > EMPS > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output.	A
   DTCs are output.	B

Result: 

A 

END 

Result: 

B 

REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY. Refer to  REMOVAL [06/2018 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ]