DTC C1581: Assist Map Number Un-Writing [08/2016 - ]: Procedure

1. Perform assist map writing.

   Refer to CALIBRATION [09/2014 - 03/2019] , or refer to CALIBRATION [03/2019 - ]

   Chassis > EMPS > Utility 

   Tester Display
   Signal Check

2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2016 - 11/2017] , or refer to DTC CHECK / CLEAR [11/2017 - 03/2019] , or refer to DTC CHECK / CLEAR [03/2019 - ]

   Chassis > EMPS > Trouble Codes 

   Result

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

   NOTE:

   DTC C1581 is cleared after the assist map is written.

Result: 

B 

END 

Result: 

A 

See step  2

1. Check for DTCs.

   Refer to DIAGNOSIS SYSTEM [08/2016 - 11/2017] , or refer to DIAGNOSIS SYSTEM [11/2017 - 03/2019] , or refer to DIAGNOSIS SYSTEM [03/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 01/2023] , or refer to DIAGNOSIS SYSTEM [01/2023 - 10/2023] , or refer to DIAGNOSIS SYSTEM [10/2023 - ]

   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 [09/2014 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2019 - 01/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [01/2023 - ] 

Result: 

A 

See step  3

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

   Related Part	ECM
   	AVS ECU (Absorber Control ECU)

   NOTE:

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

   • ECM

     Refer to REMOVAL [09/2014 - ]

   • AVS ECU (Absorber Control ECU)

     Refer to REMOVAL [08/2016 - 01/2023] , or refer to REMOVAL [01/2023 - ]

   Result

   Result	Proceed to
   The related part has the correct part number.	A
   A 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 for a related part are output.

   HINT: 

   If system DTCs for a related part are stored, assist map writing to the power steering ECU assembly may not be performed properly.

   Result

   Result	Proceed to
   System DTCs for a related part are output.	A
   System DTCs for a related part are not output.	B

Result: 

A 

GO TO DIAGNOSTIC PROCEDURE INDICATED BY OUTPUT DTC 

Result: 

B 

REPLACE POWER STEERING ECU ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

1. Replace the related part with one that has the correct part number.
   • ECM

     Refer to REMOVAL [09/2014 - ]

   • AVS ECU (Absorber Control ECU)

     Refer to REMOVAL [08/2016 - 01/2023] , or refer to REMOVAL [01/2023 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2016 - 11/2017] , or refer to DTC CHECK / CLEAR [11/2017 - 03/2019] , or refer to DTC CHECK / CLEAR [03/2019 - ]

   Chassis > EMPS > Trouble Codes 

   Result

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

Result: 

A 

END 

Result: 

B 

REPLACE POWER STEERING ECU ASSEMBLY. Refer to  REMOVAL [09/2014 - ]