Dtc C1789/89 Vehicle Identification Malfunction

DESCRIPTION

INSPECTION PROCEDURE

PERFORM REGISTRATION

CHECK FOR DTC

CHECK PART NUMBER

CLEAR DTC

CHECK FOR DTC

DESCRIPTION

1. This DTC is stored when the suspension control ECU is initialized and is cleared when the vehicle identification information received through CAN communication system is correctly stored in the EEPROM.
   
2. DTC C1789/89 is stored when an incorrect ECM is installed as the vehicle specification and data do not match.
   

INSPECTION PROCEDURE

NOTICE:

1. When replacing the suspension control ECU, perform registration (LandCruiser RM000003X4500TX.html).
   
2. Do not exchange the suspension control ECU with a normally functioning one from another vehicle to perform troubleshooting.
   

1. Perform registration (LandCruiser RM000003X4500TX.html).
   

1. Clear DTC (LandCruiser RM000001G7P02NX.html).
   

2. Check if DTC C1789/89 is output (LandCruiser RM000001G7P02NX.html).
   

   OK:

   DTC C1789/89 is not output.
   

1. Check that the part number of the installed ECM is correct (for 1KD-FTV: LandCruiser RM0000013Z002CX.html, for 1GR-FE: LandCruiser RM00000329203TX.html, for 1GD-FTV: LandCruiser RM0000013Z002DX.html).
   

   NOTICE:

   When removing the ECM to check the part number, or when replacing the ECM, be sure to follow the appropriate procedures and precautions.

   OK:

   ECM with correct part number is installed.
   

   Result	Proceed to
   OK	A
   NG (for 1KD-FTV)	B
   NG (for 1GR-FE)	C
   NG (for 1GD-FTV)	D

1. Clear the DTC (LandCruiser RM000001G7P02NX.html).
   

1. Check if DTC C1789/89 is output (LandCruiser RM000001G7P02NX.html).
   

   OK:

   DTC C1789/89 is not output.
   

   HINT:

   If no parts are replaced and DTC C1789/89 is output, there may be an internal malfunction in the suspension control ECU. In this case, replace the suspension control ECU.