Lexus NX: ECM Communication Circuit (C1203)

DESCRIPTION

This circuit is used to send TRAC and VSC information from the skid control ECU (brake booster with master cylinder assembly) to the hybrid vehicle control ECU, and hybrid control system information from the hybrid vehicle control ECU to the skid control ECU (brake booster with master cylinder assembly) via CAN communication.

Identification information sent from other ECUs is stored when the vehicle is shipped from the factory and used as the default values.

NOTICE:

DTC C1203 is output when an incorrect ECU is installed. If initialization is performed and learning occurs with an incorrect ECU installed, operations and functions will differ from those stored when the vehicle was shipped from the factory. Therefore, make sure that learning occurs properly.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1203

ECM Communication Circuit

-

Either of the following is detected:

  • Identification information sent from other ECUs does not match with the value stored when shipped from the factory.
  • No stored information for destination.
  • The wrong ECU or sensor was installed
  • Skid control ECU (Brake booster with master cylinder assembly)

-

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

    Click here

  • When replacing the yaw rate and acceleration sensor (airbag ECU assembly), perform zero point calibration.

    Click here

  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).

    If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.

    Click here

PROCEDURE

1.

CHECK PART NUMBER

(a) Check that the proper hybrid vehicle control ECU, main body ECU (multiplex network body ECU) and yaw rate and acceleration sensor (airbag ECU assembly) are installed.

OK:

Proper ECUs and sensor are installed.

(b) Check if the hybrid vehicle control ECU, main body ECU (multiplex network body ECU) and yaw rate and acceleration sensor (airbag ECU assembly) were replaced before the DTC was recorded.

OK:

ECU or sensor was not replaced.

Result

Proceed to

OK

A

NG (A proper hybrid vehicle control ECU is not installed and/or the hybrid vehicle control ECU was replaced.)

B

NG (A proper main body ECU (multiplex network body ECU) is not installed and/or the main body ECU (multiplex network body ECU) was replaced.)

C

NG (A proper yaw rate and acceleration sensor (airbag ECU assembly) is not installed and/or the yaw rate and acceleration sensor (airbag ECU assembly) was replaced.)

D

B

REPLACE HYBRID VEHICLE CONTROL ECU

C

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

D

REPLACE AIRBAG ECU ASSEMBLY

A

2.

PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE

(a) Perform initialization and calibration of the linear solenoid valve.

Click here

Chassis > ABS/VSC/TRAC > Utility

Tester Display

ECB Utility

HINT:

Before performing initialization and calibration of the linear solenoid valve, DTC C1203/95 will be output.

NEXT

3.

RECONFIRM DTC

(a) Turn the power switch off.

(b) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(c) Turn the power switch off.

(d) Turn the power switch on (IG).

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Proceed to

DTC C1203 is output.

A

DTC C1203 is not output.

B

A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

B

END

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